Relevant bibliographies by topics / Self compatible

Academic literature on the topic 'Self compatible'

Author: Grafiati
Published: 4 June 2021
Last updated: 20 February 2023

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Journal articles on the topic "Self compatible"

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Douglas, Norman A. "Tripterocalyx carneus (Nyctaginaceae) Is Self-Compatible." Southwestern Naturalist 53, no. 3 (September 2008): 403–6. http://dx.doi.org/10.1894/dw-117.1.

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Jacob, Pierre. "Is self-knowledge compatible with externalism?" Mind & Society 2, no. 1 (March 2001): 59–75. http://dx.doi.org/10.1007/bf02512075.

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Gao, Xin-Qi, Dongzi Zhu, and Xiansheng Zhang. "Stigma factors regulating self-compatible pollination." Frontiers in Biology 5, no. 2 (April 2010): 156–63. http://dx.doi.org/10.1007/s11515-010-0024-7.

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Ortega, E., and F. Dicenta. "Self-fertilization in homozygous and heterozygous self-compatible almonds." Scientia Horticulturae 109, no. 3 (July 2006): 288–92. http://dx.doi.org/10.1016/j.scienta.2006.04.017.

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Zhang, X., C. Ma, D. Yin, W. Zhu, C. Gao, J. Zhang, and T. Fu. "Characterization of S haplotype in a new self-compatible Brassica rapa cultivar Dahuangyoucai." Czech Journal of Genetics and Plant Breeding 49, No. 4 (November 26, 2013): 157–63. http://dx.doi.org/10.17221/159/2012-cjgpb.

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The most important Brassica species, B. rapa, is naturally self-incompatible. Self-compatible mutants would be useful for dissecting the molecular mechanism of self-incompatibility (SI), a process that promotes outcrossing by recognizing and refusing self-pollens. The S haplotype in a new self-compatible B. rapa cultivar, Dahuangyoucai, was characterized for the first time in this study. Sequence analysis of the S-locus genes, SLG (S-locus glycoprotein), SRK (S-locus receptor kinase) and SCR (S-locus cysteine-rich protein) revealed that Dahuangyoucai contained S haplotype highly similar to S-f2, a non-functional class I S haplotype identified in another self-compatible B. rapa cultivar, Yellow Sarson. Mutations of MLPK (M-locus protein kinase) and non-transcription of the male determinant, SCR, were observed in this cultivar, which is similar to the situation reported in Yellow Sarson. With respect to the female determinant, SRK, no transcript was detected in Yellow Sarson but two fragments were detected in Dahuangyoucai. One fragment was highly similar to SRK-f2, but the other fragment was different from the signal factors previously identified in the SI reaction. The results suggest that Dahuangyoucai and Yellow Sarson have the same origin and a similar mechanism of self-compatibility, but diverge after mutations in SRK, SCR and MLPK. Further studying the self-compatibility of Dahuangyoucai might identify novel factors involved in the SI signalling cascade and provide new insights into the mechanisms of SI in Brassicaceae.
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Choi, Cheol, and Frank Kappel. "Inbreeding, Coancestry, and Founding Clones of Sweet Cherries from North America." Journal of the American Society for Horticultural Science 129, no. 4 (July 2004): 535–43. http://dx.doi.org/10.21273/jashs.129.4.0535.

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Inbreeding and coancestry coefficients were calculated for 66 sweet cherry (Prunus avium L.) selections released from four breeding programs in North America (HRIO, Vineland, Ont., IAREC, Prosser, Wash., NYSAES, Geneva, N.Y., and PARC, Summerland, B.C.). Highly used founding clones were `Black Heart', `Emperor Francis', `Empress Eugenie', `Napoleon' and `Windsor'. Coefficients of coancestry between all selections and these clones averaged 0.038, 0.045, 0.060, 0.091, and 0.033, respectively. In these five founding clones, coefficients of coancestry in self-compatible selections were over twice as much as those in self-incompatible selections except `Windsor'. In the analysis of coefficients of coancestry between self-incompatible and self-compatible sweet cherry, almost 20% of self-incompatible selections represent more than a half-sib relationship (0.125) to self-compatibles. Increasing and maintaining genetic diversity is needed in sweet cherry breeding program in North America for continued breeding progress.
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EGEA, JOSÉ. "Pistil receptivity in self-compatible almond cultivars." Israel Journal of Plant Sciences 52, no. 2 (January 1, 2004): 149–53. http://dx.doi.org/10.1560/jnnv-hl8h-8mxc-edl0.

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Warfield, T. A. "Privileged self-knowledge and externalism are compatible." Analysis 52, no. 4 (October 1, 1992): 232–37. http://dx.doi.org/10.1093/analys/52.4.232.

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Carroll, John W. "Self Visitation, Traveler Time, and Compatible Properties." Canadian Journal of Philosophy 41, no. 3 (September 2011): 359–70. http://dx.doi.org/10.1353/cjp.2011.0025.

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IntroductionTed Sider aptly and concisely states the self-visitation paradox thus: ‘Suppose I travel back in time and stand in a room with my sitting 10-year-old self. I seem to be both sitting and standing, but how can that be?’ (2001, 101). I will explore a relativist resolution of this paradox offered by, or on behalf of, endurantists. It maintains that the sitting and the standing are relative to the personal time or proper time of the time traveler and is intended to yield the result that Ted is sitting at a certain initial personal/proper time but is not standing relative to that time. Similarly, it is also supposed to yield that Ted is standing relative to a later personal/proper time, but not sitting relative to that time. Such a traveler-time relativism has been offered by Paul Horwich (1975, 433-5; 1987, 114-15) and also by Simon Keller and Michael Nelson (2001, 344). I will show that this relativist approach is a non-starter. It is so because Ted is sitting and standing at both the initial and the later personal/proper time.
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Seifert, W., V. Pluschke, C. Goupil, K. Zabrocki, E. Müller, and G. J. Snyder. "Maximum performance in self-compatible thermoelectric elements." Journal of Materials Research 26, no. 15 (August 5, 2011): 1933–39. http://dx.doi.org/10.1557/jmr.2011.139.

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Dissertations / Theses on the topic "Self compatible"

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Lin, Yunfeng. "Evaluation of Incentive-compatible Differentiated Scheduling for Packet-switched Networks." Thesis, University of Waterloo, 2005. http://hdl.handle.net/10012/1202.

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Communication applications have diverse network service requirements. For instance, Voice over IP (VoIP) demands short end-to-end delay, whereas File Transfer Protocol (FTP) benefits more from high throughput than short delay. However, the Internet delivers a uniform best-effort service. As a result, much research has been conducted to enhance the Internet to provide service differentiation. Most of the existing proposals require additional access-control mechanisms, such as admission control and pricing, which are complicated to implement and render these proposals not incrementally deployable. Incentive-compatible Differentiated Scheduling (ICDS) provides incentives for applications to choose a service class according to their burst characteristics without additional access-control mechanisms.

This thesis investigates the behaviour of ICDS with different types of traffic by analysis and extensive simulations. The results show some evidences that ICDS can achieve its design goal. In addition, this thesis revises the initial ICDS algorithm to provide fast convergence for TCP traffic.
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McPherson, Timothy Steven. "A force and displacement self-sensing method for a mri compatible tweezer end effector." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44829.

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This work describes a self-sensing technique for a piezoelectrically driven MRI-compatible tweezer style end effector, suitable for robot assisted, MRI guided surgery. Nested strain amplification mechanisms are used to amplify the displacement of the piezo actuators to practical levels for robotics. By using a hysteretic piezoelectric model and a two port network model for the compliant nested strain amplifiers, it is shown that force and displacement at the tweezer tip can be estimated if the input voltage and charge are measured. One piezo unit is used simultaneously as a sensor and an actuator, preserving the full actuation capability of the device. Experimental validation shows an average of 12% error between the self-sensed and true values.
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Xing, Hanqing. "Fully digital-compatible built-in self-test solutions to linearity testing of embedded mixed-signal functions." [Ames, Iowa : Iowa State University], 2008.

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Gonçalves, Paula Vieira Cristina Alexandra. "Population genetic studies of the S-locus gene family and other loci in self-compatible and self-incompatible populations of the plant Antirrhinum." Thesis, University of Edinburgh, 2000. http://hdl.handle.net/1842/10925.

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In this work the mating system of several populations and species of Antirrhinum were established in the glasshouse. Levels of DNA diversity were estimated based on cyc and fil1 nuclear genes. Both genes are shown to belong to gene families. In these gene families, some members are very similar, which makes difficult to determine orthology. In the cases where orthology is not a problem, low levels of nucleotide diversity were found. Therefore the effect of the mating system on genetic diversity could not be tested. An unexpected finding of very little divergence between several Antirrhinum species, Digitalis, and the more distantly related genus Verbascum was also found for genes of the cyc and fill gene families. The generality of this pattern was addressed by extending these studies to fil2, far, globosa and Adh genes. Evidence is shown that these genes are also members of gene families in Antirrhinum. For fil2, far, and globosa, very similar sequences were found in Antirrhinum and Verbascum. For Adh I could not determine orthology because repeated gene duplication and loss of elements in this gene family has occurred in the Antirrhinum and Verbascum lineages. Several hypotheses that could account for the low diversity and divergence are discussed. In Antirrhinum, self-incompatibility is controlled by a gametophytic system. The gene responsible for pistil self-incompatibility is the S-locus that encodes basic glycoproteins with ribonuclease activity. High levels of variability are observed, consistent with frequency-dependent selection. The putative targets of selection are those regions, such as the hypervariable regions of this gene, that may be involved in specificity determination. In order to gather evidence on whether these regions are hypervariable because they are the target of selection, or merely regions of relaxed selective constraint, we have partially sequenced Antirrhinum S-alleles and analysed their level and pattern of nucleotide diversity. Within each allelic type, low levels of diversity were observed. Similar alleles were found in self-compatible and self-incompatible species, suggesting that the Antirrhinum group evolved recently.
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Lin, Zongcheng. "Functional transfer of the Papaver SI system into self-compatible A. thaliana and investigating the role of the proteasome in the Papaver SI response." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/5665/.

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Self-incompatibility is adopted by many flowering plants to prevent inbreeding, and is controlled by a multi-allelic \(S\)-locus. In \(Papaver\) \(rhoeas\), the pistil \(S\)-determinant is PrsS (a small secreted protein); the pollen \(S\)-determinant is PrpS (a novel transmembrane protein). Cognate PrpS-PrsS interaction induces DEVDase-mediated programmed cell death of incompatible pollen. Here, we examined the role of proteasome during the \(Papaver\) SI response and showed that the proteasome is a target of the \(Papaver\) SI response, and is distinct from the SI-induced DEVDase activity. Our main focus here is translational work, attempting to move the Papaver SI system into \(A\). \(thaliana\). We previously demonstrated that PrpS:GFP expressed in \(A\). \(thaliana\) pollen was functional \(in\) \(vitro\). Here, we expressed the female \(S\)-determinant, PrsS, in \(A\). \(thaliana\) and investigated function \(in\) \(vivo\). We present data demonstrating that transgenic A. thaliana stigmas expressing PrsS pollinated with \(A\). \(thaliana\) pollen expressing PrpS:GFP inhibited pollen tube growth in an S-specific manner, and virtually no seed was set. Transformation of both \(PrpS\)\(:\)\(GFP\) and \(PrsS\) into \(A\). \(thaliana\) generated self-incompatible plants that set no self-seed. This demonstrates that transfer of the \(Papaver\) SI system into a highly diverged self-compatible species can result in a fully functional SI system.
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Dhungana, Daya Sagar. "Growth of InAs and Bi1-xSBx nanowires on silicon for nanoelectronics and topological qubits by molecular beam epitaxy." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30150/document.

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Grâce à leur propriétés uniques, les nanofils d'InAs et de Bi1-xSbx sont important pour les domaines de la nanoélectronique et de l'informatique quantique. Alors que la mobilité électronique de l'InAs est intéressante pour les nanoélectroniques; l'aspect isolant topologique du Bi1-xSbx peut être utilisé pour la réalisation de Qubits basés sur les fermions de Majorana. Dans les deux cas, l'amélioration de la qualité du matériau est obligatoire et ceci est l'objectif principal cette thèse ou` nous étudions l'intégration des nanofils InAs sur silicium (compatibles CMOS) et où nous développons un nouvel isolant topologique nanométrique: le Bi1-xSbx. Pour une compatibilité CMOS complète, la croissance d'InAs sur Silicium nécessite d'être auto- catalysée, entièrement verticale et uniforme sans dépasser la limite thermique de 450 ° C. Ces normes CMOS, combineés à la différence de paramètre de maille entre l'InAs et le silicium, ont empêché l'intégration de nanofils InAs pour les dispositifs nanoélectroniques. Dans cette thèse, deux nouvelles préparations de surface du Si ont été étudiées impliquant des traitements Hydrogène in situ et conduisant à la croissance verticale et auto-catalysée de nanofils InAs compatible avec les limitations CMOS. Les différents mécanismes de croissance résultant de ces préparations de surface sont discutés en détail et un passage du mécanisme Vapor-Solid (VS) au mécanisme Vapor- Liquid-Solid (VLS) est rapporté. Les rapports d'aspect très élevé des nanofils d'InAs sont obtenus en condition VLS: jusqu'à 50 nm de diamètre et 3 microns de longueur. D'autre part, le Bi1-xSbx est le premier isolant topologique 3D confirmé expérimentalement. Dans ces nouveaux matériaux, la présence d'états surfacique conducteurs, entourant le coeur isolant, peut héberger les fermions de Majorana utilisés comme Qubits. Cependant, la composition du Bi1-xSbx doit être comprise entre 0,08 et 0,24 pour que le matériau se comporte comme un isolant topologique. Nous rapportons pour la première fois la croissance de nanofils Bi1-xSbx sans défaut et à composition contrôlée sur Si. Différentes morphologies sont obtenues, y compris des nanofils, des nanorubans et des nanoflakes. Leur diamètre peut être de 20 nm pour plus de 10 microns de long, ce qui en fait des candidats idéaux pour des dispositifs quantiques. Le rôle clé du flux Bi, du flux de Sb et de la température de croissance sur la densité, la composition et la géométrie des structures à l'échelle nanométrique est étudié et discuté en détail
InAs and Bi1-xSbx nanowires with their distinct material properites hold promises for nanoelec- tronics and quantum computing. While the high electron mobility of InAs is interesting for na- noelectronics applications, the 3D topological insulator behaviour of Bi1-xSbx can be used for the realization of Majorana Fermions based qubit devices. In both the cases improving the quality of the nanoscale material is mandatory and is the primary goal of the thesis, where we study CMOS compatible InAs nanowire integration on Silicon and where we develop a new nanoscale topological insulator. For a full CMOS compatiblity, the growth of InAs on Silicon requires to be self-catalyzed, fully vertical and uniform without crossing the thermal budge of 450 °C. These CMOS standards, combined with the high lattice mismatch of InAs with Silicon, prevented the integration of InAs nanowires for nanoelectronics devices. In this thesis, two new surface preparations of the Silicon were studied involving in-situ Hydrogen gas and in-situ Hydrogen plasma treatments and leading to the growth of fully vertical and self-catalyzed InAs nanowires compatible with the CMOS limitations. The different growth mechanisms resulting from these surface preparations are discussed in detail and a switch from Vapor-Solid (VS) to Vapor- Liquid-Solid (VLS) mechanism is reported. Very high aspect ratio InAs nanowires are obtained in VLS condition: upto 50 nm in diameter and 3 microns in length. On the other hand, Bi1-xSbx is the first experimentally confirmed 3D topololgical insulator. In this new material, the presence of robust 2D conducting states, surrounding the 3D insulating bulk can be engineered to host Majorana fermions used as Qubits. However, the compostion of Bi1-xSbx should be in the range of 0.08 to 0.24 for the material to behave as a topological insula- tor. We report growth of defect free and composition controlled Bi1-xSbx nanowires on Si for the first time. Different nanoscale morphologies are obtained including nanowires, nanoribbons and nanoflakes. Their diameter can be 20 nm thick for more than 10 microns in length, making them ideal candidates for quantum devices. The key role of the Bi flux, the Sb flux and the growth tem- perature on the density, the composition and the geometry of nanoscale structures is investigated and discussed in detail
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Ewedje, Eben-Ezer. "Biologie de la reproduction, phylogéographie et diversité de l'arbre à beurre Pentadesma butyracea Sabine, Clusiaceae: implications pour sa conservation au Bénin." Doctoral thesis, Universite Libre de Bruxelles, 2012. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209647.

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Pentadesma butyracea Sabine est l’une des quatre espèces du genre Pentadesma endémique de l’Afrique. Elle est distribuée de la Sierra Léone au Gabon dans deux grands types d’habitats :les forêts denses humides discontinues du domaine guinéo-congolais (Haute- et Basse-Guinée) et le domaine soudanien du couloir sec du Dahomey (assimilé à une barrière à l’échange de gènes et d’espèces entre les deux blocs guinéo-congolais). Dans ce dernier, l’espèce se retrouve dans des galeries forestières et occupe une place capitale dans le développement socio-économique des communautés locales en raison des multiples biens et services que procurent ses produits (alimentation, médecine et pharmacopée traditionnelle, etc.). Cependant, des pressions d’origines multiples, telles que le ramassage des graines pour fabriquer du beurre, la fragmentation de l’habitat et sa destruction en faveur du maraîchage, les pratiques culturales inadaptées, les incendies, font peser de lourdes menaces sur l’espèce.

Le but de ce travail est d’acquérir les connaissances requises pour la conservation et la gestion durable des ressources génétiques de l’espèce. Trois objectifs ont été définis :(i) étudier la phylogéographie de l’espèce, (ii) étudier sa variabilité morphologique et génétique au Bénin et (iii) caractériser sa biologie de reproduction. En amont de ces travaux, nous avons développé onze marqueurs microsatellites nucléaires chez P. butyracea (chapitre 2). Ils ont été utilisés pour l’étude de la phylogéographie et la diversité génétique de P. butyracea (chapitres 3 et 5), ainsi que pour étudier la dépression de consanguinité et les paramètres de son système de reproduction (chapitre 7).

La caractérisation de la répartition spatiale des lignées génétiques de régions intergéniques de l’ADN chloroplastique et de l’ADN ribosomal (ITS) a détecté deux lignées génétiques allopatriques entre le Haut et le Bas-Guinéen, indiquant une forte différenciation génétique et un signal phylogéographique. L’analyse des microsatellites détecte trois pools géniques correspondant aux trois régions étudiées (Haute Guinée, Dahomey Gap et Basse Guinée). La diversité génétique est faible dans le Dahomey Gap, modérée dans le Haut-Guinéen et élevée dans le Bas-Guinéen. Ces résultats indiquent une séparation très ancienne des populations d’Afrique centrale et d’Afrique de l’ouest, alors que celles du Dahomey Gap pourraient résulter des forêts denses humides de l’Afrique de l’ouest lors de la période Holocène humide africaine. Dans ce couloir sec, les populations ont subi une forte dérive génétique, potentiellement due à des évènements de fondation. Au Bénin, deux groupes éco-morphologiques ont été détectés suivant un gradient nord-sud, contrastant avec deux pools géniques présentant une distribution est-ouest.

P. butyracea est une espèce auto-compatible majoritairement allogame. La corrélation de paternité est plus élevée aux niveaux intra-fruit vs. inter-fruits, et au sein d’une population de petite taille vs. de grande taille. Les principaux pollinisateurs au Bénin sont deux oiseaux (Cyanomitra verticalis, Cinnyris coccinigastrus) et trois abeilles (Apis mellifera, Meliponula togoensis, Hypotrigona sp.). La productivité totale en fruits augmente en fonction de l’âge de l’arbre et varie en fonction de l’année, atteignant un pic pour les arbres ayant un diamètre de 60-80 cm. Les graines sont récalcitrantes et ont une teneur en eau de 42.5 ± 2.9 %.

L’analyse des paramètres de reproduction et de diversité génétique, associés aux facteurs écogéographiques, nous a permis de proposer un échantillon de neuf populations représentatives de la diversité à l’échelle du Bénin, dans la perspective d’une conservation in situ. Le succès de celle-ci dépendra des efforts conjugués des communautés locales, de la recherche forestière et de la définition d’un cadre législatif par le politique pour la protection des habitats. La conservation ex situ est envisagée sous forme d’un verger rassemblant diverses origines, présentant l’intérêt supplémentaire de permettre d’étudier les contributions de la diversité génétique et de la plasticité phénotypique à la variation phénotypique. / Pentadesma butyracea Sabine is one of the four species of the endemic genus Pentadesma in Africa. The species is distributed from Sierra Leone to Gabon in two major types of habitats: the discontinuous and dense Guineo-Congolian rainforests (Upper and Lower Guinea) and the Sudanian domain of the dry corridor of Dahomey (considered as a barrier to the exchange of genes and species between Upper and Lower Guinea). In the latter, the species is found in gallery forests and plays a vital role in the socio-economic livelihood of local communities due to the various resources and services that provide its products (food, medicine and traditional, etc.). However, pressure from many sources including the collection of seeds to make butter, habitat fragmentation and its destruction for market gardening, inadequate agricultural practices, fires, are serious threats to the species.

The aim of this work was to acquire appropriate knowledge for the conservation and sustainable management of genetic resources of the species. Three objectives were defined (i) study the phylogeography of the species; (ii) evaluate its morphological and genetic variability in Benin; and (iii) characterize its reproductive biology. In a preliminary work, eleven nuclear microsatellite markers of P. butyracea were developed (Chapter 2). They were used for the study of phylogeography and genetic diversity of P. butyracea (chapters 3 and 5), and to study the inbreeding depression and parameters of its breeding system (Chapter 7).

The characterization of the genetic lineages and their spatial distribution using intergenic regions from chloroplast DNA and ribosomal DNA (ITS) region detected two allopatric genetic lineages between Upper and Lower Guinea, indicating a high genetic differentiation and a phylogeographic signal. Microsatellite markers allowed us to detect three genepools matching with the three studied regions (Upper Guinea, Dahomey-Gap and Lower Guinea). Genetic diversity was low in the Dahomey Gap, moderate in Upper Guinea and high in Lower Guinea. These results indicate an ancient separation of populations from Central and West Africa, while those from Dahomey Gap could originate West African rainforests (Upper Guinea) during the African humid Holocene period. In this dry corridor, populations experienced high genetic drift, possibly due to founding events. In Benin, two eco-morphological groups were detected following a north-south gradient, contrasting with two gene pools presenting an east-west distribution.

Pentadesma butyracea is a self-compatible, mainly allogamous species. The correlation of paternity was higher within-fruit vs. among-fruits, and in population of small size vs. large size. The main pollinators in Benin are two birds (Cyanomitra verticalis, Cinnyris coccinigastrus) and three bees (Apis mellifera, Meliponula togoensis, Hypotrigona sp.). Total productivity in fruit increases with tree age and varies yearly, reaching a peak for trees of 60-80 cm of diameter class. Seeds are recalcitrant (i.e. they cannot be conserved at low temperature), having a water content of 42.5 ± 2.9% at maturity.

The analysis of reproduction and genetics parameters, associated with eco-geographic factors, enabled us to select nine populations representative of the diversity in Benin, from the perspective of in situ conservation. The success of the latter will depend on combined efforts of local communities, forest research and an adequate legislative framework for the protection of habitats. Ex situ conservation is envisaged as an orchard assembling various origins, and would have the additional advantage of allowing to study the contribution of genetic diversity and phenotypic plasticity to phenotypic variation.
Doctorat en Sciences
info:eu-repo/semantics/nonPublished

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Davila, Yvonne Caroline. "Pollination ecology of Trachymene incisa (Apiaceae): Understanding generalised plant-pollinator systems." Thesis, The University of Sydney, 2006. http://hdl.handle.net/2123/1896.

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A renewed focus on generalised pollinator systems has inspired a conceptual framework which highlights that spatial and temporal interactions among plants and their assemblage of pollinators can vary across the individual, population, regional and species levels. Pollination is clearly a dynamic interaction, varying in the number and interdependence of participants and the strength of the outcome of the interaction. Therefore, the role of variation in pollination is fundamental for understanding ecological dynamics of plant populations and is a major factor in the evolution and maintenance of generalised and specialised pollination systems. My study centred on these basic concepts by addressing the following questions: (1) How variable are pollinators in a generalised pollination system? To what degree do insect visitation rates and assemblage composition vary spatially among populations and temporally among flowering seasons? (2) How does variation in pollinators affect plant reproductive success? I chose to do this using a model system, Trachymene incisa subsp. incisa (Apiaceae), which is a widespread Australian herbaceous species with simple white flowers grouped into umbels that attract a high diversity of insect visitors. The Apiaceae are considered to be highly generalist in terms of pollination, due to their simple and uniform floral display and easily accessible floral rewards. Three populations of T. incisa located between 70 km and 210 km apart were studied over 2-3 years. The few studies investigating spatial and temporal variation simultaneously over geographic and yearly/seasonal scales indicate that there is a trend for more spatial than temporal variation in pollinators of generalist-pollinated plants. My study showed both spatial and temporal variation in assemblage composition among all populations and variation in insect visitation rates, in the form of a significant population by year interaction. However, removing ants from the analyses to restrict the assemblage to flying insects and the most likely pollinators, resulted in a significant difference in overall visitation rate between years but no difference in assemblage composition between the Myall Lakes and Tomago populations. These results indicate more temporal than spatial variation in the flying insect visitor assemblage of T. incisa. Foraging behaviour provides another source of variation in plant-pollinator interactions. Trachymene incisa exhibits umbels that function as either male or female at any one time and offer different floral rewards in each phase. For successful pollination, pollinators must visit both male and female umbels during a foraging trip. Insects showed both preferences and non-preferences for umbel phases in natural patches where the gender ratio was male biased. In contrast, insects showed no bias in visitation during a foraging trip or in time spent foraging on male and female umbels in experimental arrays where the gender ratio was equal. Pollinator assemblages consisting of a mixture of different pollinator types coupled with temporal variation in the assemblages of populations among years maintains generalisation at the population/local level. In addition, spatial variation in assemblages among populations maintains generalisation at the species level. Fire alters pollination in T. incisa by shifting the flowering season and reducing the abundance of flying insects. Therefore, fire plays an important role in maintaining spatial and temporal variation in this fire-prone system. Although insect pollinators are important in determining the mating opportunities of 90% of flowering plant species worldwide, few studies have looked at the effects of variation in pollinator assemblages on plant reproductive success and mating. In T. incisa, high insect visitation rates do not guarantee high plant reproductive success, indicating that the quality of visit is more important than the rate of visitation. This is shown by comparing the Agnes Banks and Myall Lakes populations in 2003: Agnes Banks received the highest visitation rate from an assemblage dominated by ants but produced the lowest reproductive output, and Myall Lakes received the lowest visitation rate by an assemblage dominated by a native bee and produced the highest seedling emergence. Interestingly, populations with different assemblage composition can produce similar percentage seed set per umbel. However, similar percentage seed set did not result in similar percentage seedling emergence. Differences among years in reproductive output (total seed production) were due to differences in umbel production (reproductive effort) and proportion of umbels with seeds, and not seed set per umbel. Trachymene incisa is self-compatible and suffers weak to intermediate levels of inbreeding depression through early stages of the life cycle when seeds are self-pollinated and biparentally inbred. Floral phenology, in the form of synchronous protandry, plays an important role in avoiding self-pollination within umbels and reducing the chance of geitonogamous pollination between umbels on the same plant. Although pollinators can increase the rate of inbreeding in T. incisa by foraging on both male and female phase umbels on the same plant or closely related plants, most consecutive insect movements were between plants not located adjacent to each other. This indicates that inbreeding is mostly avoided and that T. incisa is a predominantly outcrossing species, although further genetic analyses are required to confirm this hypothesis. A new conceptual understanding has emerged from the key empirical results in the study of this model generalised pollination system. The large differences among populations and between years indicate that populations are not equally serviced by pollinators and are not equally generalist. Insect visitation rates varied significantly throughout the day, highlighting that sampling of pollinators at one time will result in an inaccurate estimate and usually underestimate the degree of generalisation. The visitor assemblage is not equivalent to the pollinator assemblage, although non-pollinating floral visitors are likely to influence the overall effectiveness of the pollinator assemblage. Given the high degree of variation in both the number of pollinator species and number of pollinator types, I have constructed a model which includes the degree of ecological and functional specialisation of a plant species on pollinators and the variation encountered across different levels of plant organisation. This model describes the ecological or current state of plant species and their pollinators, as well as presenting the patterns of generalisation across a range of populations, which is critical for understanding the evolution and maintenance of the system. In-depth examination of pollination systems is required in order to understand the range of strategies utilised by plants and their pollinators, and I advocate a complete floral visitor assemblage approach to future studies in pollination ecology. In particular, future studies should focus on the role of introduced pollinators in altering generalised plant-pollinator systems and the contribution of non-pollinating floral visitors to pollinator assemblage effectiveness. Comparative studies involving plants with highly conserved floral displays, such as those in the genus Trachymene and in the Apiaceae, will be useful for investigating the dynamics of generalised pollination systems across a range of widespread and restricted species.
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Davila, Yvonne Caroline. "Pollination ecology of Trachymene incisa (Apiaceae): Understanding generalised plant-pollinator systems." University of Sydney, 2006. http://hdl.handle.net/2123/1896.

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Doctor of Philosophy (PhD)
A renewed focus on generalised pollinator systems has inspired a conceptual framework which highlights that spatial and temporal interactions among plants and their assemblage of pollinators can vary across the individual, population, regional and species levels. Pollination is clearly a dynamic interaction, varying in the number and interdependence of participants and the strength of the outcome of the interaction. Therefore, the role of variation in pollination is fundamental for understanding ecological dynamics of plant populations and is a major factor in the evolution and maintenance of generalised and specialised pollination systems. My study centred on these basic concepts by addressing the following questions: (1) How variable are pollinators in a generalised pollination system? To what degree do insect visitation rates and assemblage composition vary spatially among populations and temporally among flowering seasons? (2) How does variation in pollinators affect plant reproductive success? I chose to do this using a model system, Trachymene incisa subsp. incisa (Apiaceae), which is a widespread Australian herbaceous species with simple white flowers grouped into umbels that attract a high diversity of insect visitors. The Apiaceae are considered to be highly generalist in terms of pollination, due to their simple and uniform floral display and easily accessible floral rewards. Three populations of T. incisa located between 70 km and 210 km apart were studied over 2-3 years. The few studies investigating spatial and temporal variation simultaneously over geographic and yearly/seasonal scales indicate that there is a trend for more spatial than temporal variation in pollinators of generalist-pollinated plants. My study showed both spatial and temporal variation in assemblage composition among all populations and variation in insect visitation rates, in the form of a significant population by year interaction. However, removing ants from the analyses to restrict the assemblage to flying insects and the most likely pollinators, resulted in a significant difference in overall visitation rate between years but no difference in assemblage composition between the Myall Lakes and Tomago populations. These results indicate more temporal than spatial variation in the flying insect visitor assemblage of T. incisa. Foraging behaviour provides another source of variation in plant-pollinator interactions. Trachymene incisa exhibits umbels that function as either male or female at any one time and offer different floral rewards in each phase. For successful pollination, pollinators must visit both male and female umbels during a foraging trip. Insects showed both preferences and non-preferences for umbel phases in natural patches where the gender ratio was male biased. In contrast, insects showed no bias in visitation during a foraging trip or in time spent foraging on male and female umbels in experimental arrays where the gender ratio was equal. Pollinator assemblages consisting of a mixture of different pollinator types coupled with temporal variation in the assemblages of populations among years maintains generalisation at the population/local level. In addition, spatial variation in assemblages among populations maintains generalisation at the species level. Fire alters pollination in T. incisa by shifting the flowering season and reducing the abundance of flying insects. Therefore, fire plays an important role in maintaining spatial and temporal variation in this fire-prone system. Although insect pollinators are important in determining the mating opportunities of 90% of flowering plant species worldwide, few studies have looked at the effects of variation in pollinator assemblages on plant reproductive success and mating. In T. incisa, high insect visitation rates do not guarantee high plant reproductive success, indicating that the quality of visit is more important than the rate of visitation. This is shown by comparing the Agnes Banks and Myall Lakes populations in 2003: Agnes Banks received the highest visitation rate from an assemblage dominated by ants but produced the lowest reproductive output, and Myall Lakes received the lowest visitation rate by an assemblage dominated by a native bee and produced the highest seedling emergence. Interestingly, populations with different assemblage composition can produce similar percentage seed set per umbel. However, similar percentage seed set did not result in similar percentage seedling emergence. Differences among years in reproductive output (total seed production) were due to differences in umbel production (reproductive effort) and proportion of umbels with seeds, and not seed set per umbel. Trachymene incisa is self-compatible and suffers weak to intermediate levels of inbreeding depression through early stages of the life cycle when seeds are self-pollinated and biparentally inbred. Floral phenology, in the form of synchronous protandry, plays an important role in avoiding self-pollination within umbels and reducing the chance of geitonogamous pollination between umbels on the same plant. Although pollinators can increase the rate of inbreeding in T. incisa by foraging on both male and female phase umbels on the same plant or closely related plants, most consecutive insect movements were between plants not located adjacent to each other. This indicates that inbreeding is mostly avoided and that T. incisa is a predominantly outcrossing species, although further genetic analyses are required to confirm this hypothesis. A new conceptual understanding has emerged from the key empirical results in the study of this model generalised pollination system. The large differences among populations and between years indicate that populations are not equally serviced by pollinators and are not equally generalist. Insect visitation rates varied significantly throughout the day, highlighting that sampling of pollinators at one time will result in an inaccurate estimate and usually underestimate the degree of generalisation. The visitor assemblage is not equivalent to the pollinator assemblage, although non-pollinating floral visitors are likely to influence the overall effectiveness of the pollinator assemblage. Given the high degree of variation in both the number of pollinator species and number of pollinator types, I have constructed a model which includes the degree of ecological and functional specialisation of a plant species on pollinators and the variation encountered across different levels of plant organisation. This model describes the ecological or current state of plant species and their pollinators, as well as presenting the patterns of generalisation across a range of populations, which is critical for understanding the evolution and maintenance of the system. In-depth examination of pollination systems is required in order to understand the range of strategies utilised by plants and their pollinators, and I advocate a complete floral visitor assemblage approach to future studies in pollination ecology. In particular, future studies should focus on the role of introduced pollinators in altering generalised plant-pollinator systems and the contribution of non-pollinating floral visitors to pollinator assemblage effectiveness. Comparative studies involving plants with highly conserved floral displays, such as those in the genus Trachymene and in the Apiaceae, will be useful for investigating the dynamics of generalised pollination systems across a range of widespread and restricted species.
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Bouanani, Shayma. "Vers l'industrialisation de l'auto-assemblage dirigé des copolymères à blocs : développement de procédés de lithographie compatibles avec les noeuds technologiques sub-10 nm pour des applications de type contacts." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAT053/document.

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La course à la compétitivité que se disputent les industriels du semi-conducteur implique d’augmenter le nombre de fonctionnalités par puce ainsi que de réduire leur coût unitaire, ce qui se traduit par une diminution continue de leur taille. Pour ce faire, le DSA (Directed Self-Assembly), ou auto-assemblage dirigé des copolymères à blocs associe les techniques de lithographie conventionnelle avec les propriétés d’organisation à l’échelle moléculaire des copolymères. Dans ce cadre, l’objectif global de cette thèse est d’évaluer le potentiel d’industrialisation du DSA par grapho-épitaxie pour des applications de type « shrink » et « multiplication » de contacts. Il s’agit en particulier de démontrer la capacité de cette technique à répondre au cahier des charges de l’ITRS en termes d’uniformité de CD, de désalignement et de taux de défauts. Une première étude concernant le « shrink de contact », basée sur l’impact des propriétés matériaux, d’affinité de surface et de tailles de guides permet de comprendre les mécanismes qui rentrent en jeu dans l’apparition de défauts d’assemblage. Une seconde partie de l’étude porte sur la multiplication de contact. Pour adresser cette application, deux types de guides ont été étudié : les guides elliptiques et les guides complexes dits « peanut ». L’étude de la fenêtre de procédé en termes de paramètres procédé comme le temps et la température de recuit, mais aussi de commensurabilité, a été menée. Une attention particulière a été portée sur l’impact de la variation du guide sur le pitch final obtenu en DSA, dont les données expérimentales ont été corrélées avec des résultats de simulation. Les critères de réussite sont basés sur les performances lithographiques qu’il faut juger à travers une métrologie de pointe. Le développement d’une métrologie spécifique pour mesurer l’erreur de placement des contacts ainsi que leur pitch a été conduite
The competitiveness-chasing in which industrial manufactures are involved, leads to an exponential increase in the number of functionalities per chips, as well as reducing their unit cost, which results in a continuous decrease of their size. To achieve this, DSA (Directed Self-Assembly) of block copolymers, combines conventional lithography techniques with the molecular-scale organizational properties of copolymers. In this framework, the overall objective of this thesis is to evaluate the industrialization potential of the DSA process by graphoepitaxy for contact hole shrink and contact multiplication applications. In particular, it is necessary to demonstrate the ability of this technique to meet the ITRS specifications in terms of CD uniformity, misalignment and hole open yield. A first study on contact shrink, based on the impact of material properties, surface affinity and guiding feature size, allows us to understand the mechanisms involved in the appearance of defects. A second part of the study deals with contact multiplication. To address this application, two types of guides have been studied: elliptical guiding patterns and more complex ones called "peanut". The study of the process window in terms of process parameters such as annealing time and temperature, but also commensurability was conducted. Particular attention was paid to guide size variation and its impact on DSA final pitch. Experimental data from this study were correlated with simulations. The success criteria are based on the lithographic performances that must be judged through advanced metrology. The development of a specific metrology to measure the placement error of contacts as well as their pitch was conducted
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Books on the topic "Self compatible"

1

Crabtree, Donald L. Basic language programming for the beginner: A self-paced text for the IBM PC and compatible computers. Dubuque, Iowa: Kendall/Hunt Pub. Co., 1987.

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E, Poor Alfred, ed. Troubleshooting your PC. Redmond, Wash: Microsoft, 2001.

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Stone, M. David. Troubleshooting your PC. 2nd ed. Redmond, Wash: Microsoft Press, 2002.

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1949-, Moulton Gary, ed. Accessible technology in today's business: Case studies for success. Redmond, Wash: Microsoft Press, 2002.

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The Harmonious Way: A Success Guide to Selecting A Compatible Mate. Pantheo, Inc., 2002.

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Partridge, Morgan. Debian 11 Bullseye after Install Self Help Guide Remastered Unofficial: Unofficial and Compatible with All Debian 11 Versions. Independently Published, 2022.

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How to Hide Your Cat From the Landlord: A Practical and Spiritual Guide to Living in Harmony with a Compatible Feline in Smaller Spaces. 2nd ed. CCB Publishing, 2006.

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ExamREVIEW. Maine Water Distribution Operator Certification Exam Unofficial Self Practice Exercise Questions: Topics compatible with exams of all classes and levels. Createspace Independent Publishing Platform, 2018.

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ExamREVIEW. Connecticut Water Distribution System Certification Exam Unofficial Self Practice Exercise Questions: Covering Fundamental Knowledge Topics compatible with most distribution exam grades. Createspace Independent Publishing Platform, 2018.

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ExamREVIEW. Connecticut Water Treatment Operator Certification Exam Unofficial Self Practice Exercise Questions: Covering Fundamental Knowledge Topics compatible with most treatment exam grades. Createspace Independent Publishing Platform, 2018.

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Book chapters on the topic "Self compatible"

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Socias, R. "Breeding Self-compatible Almonds." In Plant Breeding Reviews, 313–38. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118061053.ch9.

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Reis, Harry T. "The Role of the Self in the Initiation and Course of Social Interaction." In Compatible and Incompatible Relationships, 209–31. New York, NY: Springer New York, 1985. http://dx.doi.org/10.1007/978-1-4612-5044-9_10.

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Samuel, M. A., D. Yee, K. E. Haasen, and D. R. Goring. "‘Self’ Pollen Rejection Through the Intersection of Two Cellular Pathways in the Brassicaceae: Self-Incompatibility and the Compatible Pollen Response." In Self-Incompatibility in Flowering Plants, 173–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-68486-2_8.

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Visser, T. "The Interaction Between Compatible or Compatible and Self-incompatible Pollen of Apple and Pear as Influenced by Pollination Interval and Orchard Temperature." In Biotechnology and Ecology of Pollen, 167–72. New York, NY: Springer New York, 1986. http://dx.doi.org/10.1007/978-1-4613-8622-3_28.

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Giroult, G., A. Nouailhat, and M. Gauneau. "Study of a Polycide (WSi2/Polysilicon) Emitter for a CMOS Compatible Self-aligned Bipolar Transistor." In ESSDERC ’89, 465–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-52314-4_94.

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Chen, Mingxi. "Research on Epidemic Prevention and Management Measures in University Based on GIS and ABM – Taking South China University of Technology (Wushan Campus) as an Example." In Proceedings of the 2021 DigitalFUTURES, 148–57. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5983-6_14.

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AbstractPrevention and management of epidemic is a protracted war. As large community in city, universities are key regions in the anti-epidemic period. However, the current epidemic prevention and management measures in many universities do not compatible with the spatial form and the characteristics of the population, likely to lead to waste of resources and cause conflicts. The research simulates campus environment by constructing GIS model, and simulates the behavior of campus crowd by ABM. Under the coupling effect of the two, the real-time calculation of the spread of epidemic in universities can be calculated in real-time, making up for the deficiency of GIS model which can only do static data analysis. On this basis, research takes South China University of Technology as an example and assumes three epidemic prevention management measures, i.e. closed-off management, zoning management and self prevention, respectively to simulate the spread of the epidemic, sum up the results of different management measures and provide certain suggestions.
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Morselli, Davide, and André Berchtold. "Life Calendars for the Collection of Life Course Data." In Withstanding Vulnerability throughout Adult Life, 319–36. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-4567-0_20.

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AbstractLife course studies involve the use of longitudinal data. Focusing on vulnerability processes that unfold in the medium or long term only reinforces this use, by requiring long sequences of data. However, traditional prospective data collection methods are not always compatible with restricted research time. The alternative is to collect retrospective data, sometimes in combination with prospective ones, and life calendars are a tool of choice for this kind of task. Although several methodological studies have shown that calendar data outperform conventional retrospective question lists, the quality of retrospective and prospective data is likely not to be the same. Hence, it is crucial to develop life calendars able to enhance the correct recall of past information, and to be able to demonstrate the accuracy of the resulting data. Moreover, with the advent of online data collection, the perspective to replace paper-and-pencil life calendars by electronic ones, and to make them self-administered, could help generalize this kind of data collection, but it also implies additional challenges. This chapter draws on several experiments with life calendars performed within the NCCR LIVES. It shows that life calendars can capture accurate data, and that online calendars have now become more than just a possibility.
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Ohnishi, Ohmi, and Meiliang Zhou. "Annual Self-Compatible Species." In Buckwheat Germplasm in the World, 81–88. Elsevier, 2018. http://dx.doi.org/10.1016/b978-0-12-811006-5.00010-0.

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"Are freedom and equality compatible?" In Self-Ownership, Freedom, and Equality, 92–115. Cambridge University Press, 1995. http://dx.doi.org/10.1017/cbo9780511521270.006.

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Zhou, Meiliang, Yu Tang, Xianyu Deng, Chen Ruan, Mengqi Ding, Jirong Shao, Yixiong Tang, and Yanmin Wu. "Perennial Self-Compatible Wild Fagopyrum Species." In Buckwheat Germplasm in the World, 67–69. Elsevier, 2018. http://dx.doi.org/10.1016/b978-0-12-811006-5.00008-2.

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Conference papers on the topic "Self compatible"

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Nio, Satoru, Takeo Suzuki, Hideharu Zenpo, Kazuhiko Yokoyama, Hitoshi Wakizako, and Steve Belinski. "Vacuum-compatible robot for self-contained manufacturing." In VACUUM MECHATRONICS, FIRST INTERNATIONAL WORKSHOP. AIP, 1989. http://dx.doi.org/10.1063/1.38708.

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Pasquazi, A., M. Peccianti, L. Caspani, L. Razzari, M. Ferrera, D. Duchesne, M. Clerici, et al. "Self-locked OPO in CMOS-compatible microring resonators." In Nonlinear Photonics. Washington, D.C.: OSA, 2012. http://dx.doi.org/10.1364/np.2012.nw1c.3.

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Nadig, Sachin, Serhan Ardanuc, and Amit Lal. "Self-calibration compatible Z-axis bulk PZT vibratory gyroscope." In TRANSDUCERS 2015 - 2015 18th International Solid-State Sensors, Actuators and Microsystems Conference. IEEE, 2015. http://dx.doi.org/10.1109/transducers.2015.7181123.

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Sim, Min Soo, Kwang Soon Kim, and Chan-Byoung Chae. "Self-Interference Cancellation for LTE-Compatible Full-Duplex Systems." In 2018 IEEE International Conference on Communications Workshops (ICC Workshops). IEEE, 2018. http://dx.doi.org/10.1109/iccw.2018.8403641.

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Alzgool, Mohammad, Yu Tian, Benyamin Davaji, and Shahrzad Towfighian. "Towards a CMOS-Compatible Accelerometer Using Self-Powered Teng System." In 2022 21st International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS). IEEE, 2022. http://dx.doi.org/10.1109/powermems56853.2022.10007574.

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Tomaszewicz, P., and A. Krasniewski. "Self-testing of S-compatible test units in user-programmed FPGAs." In Proceedings 25th EUROMICRO Conference. Informatics: Theory and Practice for the New Millennium. IEEE, 1999. http://dx.doi.org/10.1109/eurmic.1999.794477.

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Nagulapalli, R., K. Hayatleh, S. Barker, S. Zourob, N. Yassine, and Sriadibhatla Sridevi. "A bio-medical compatible self bias opamp in 45nm CMOS technology." In 2017 International conference on Microelectronic Devices, Circuits and Systems (ICMDCS). IEEE, 2017. http://dx.doi.org/10.1109/icmdcs.2017.8211722.

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Sardan, Ozlem, Alaca B. Erdem, Arda D. Yalcinkaya, Peter Boggild, P. Torben Tang, and Ole Hansen. "Route to batch-compatible fabrication of nanotweezers by guided self-assembly." In 7th IEEE International Conference on Nanotechnology. IEEE, 2007. http://dx.doi.org/10.1109/nano.2007.4601405.

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Caspani, L., M. Peccianti, A. Pasquazi, M. Clerici, L. Razzari, B. E. Little, S. T. Chu, D. J. Moss, and R. Morandotti. "Self-locked low threshold OPO in a CMOS-compatible microring resonator." In CLEO: Science and Innovations. Washington, D.C.: OSA, 2012. http://dx.doi.org/10.1364/cleo_si.2012.cm2m.2.

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Mao, Chending, Jia Lin, and Sumika Arima. "Self-tuning Optimization to Compatible the Delivery and Low Energy Consumption." In 2022 International Symposium on Semiconductor Manufacturing (ISSM). IEEE, 2022. http://dx.doi.org/10.1109/issm55802.2022.10027098.

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Reports on the topic "Self compatible"

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Косенко, М. А. CROSSING OF SELF-COMPATIBLE LINES OF TRADITIONS THE EUROPEAN WINTER. LJournal, 2017. http://dx.doi.org/10.18411/e189ssz357-45h.

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Shoseyov, Oded, Steven A. Weinbaum, Raphael Goren, and Abhaya M. Dandekar. Biological Thinning of Fruit Set by RNAase in Deciduous Fruit Trees. United States Department of Agriculture, August 1993. http://dx.doi.org/10.32747/1993.7568110.bard.

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Fruit thinning is a common and necessary practice for commercial fruit production in many deciduous tree fruit species. Fruit thinning in apple may be accomplished with a variety of chemical thinning agents, but the use of these chemicals is a subject of environmental concern. It has been shown recently that RNase enzyme, secreted from the stigma and the style, inhibits pollen germination and pollen tube elongation. In this study we have been able to show that Aspergillus niger B-1 RNase can effectively inhibit peach and apple pollen germination, and tube elongation in-vitro, as well as thin fruit in peach and apple, and reduce the number of seeds in citrus. The objectives of the research were to detrmine the conditions for effective thinning of (USA and Israel), develop fermentation process for cost effective production of RNase from A. niger. (Israel), and clone apple S-RNase cDNA (USA). All the objectives of the research were addressed. We have determined the optimal fermentation conditions for cost effective production of the A. niger at a 20,000 liters scale. TheA. niger B1 RNase was isolated to homogeneity and its kinetic and biochemical properties including its N-terminal sequence were fully characterized. The field test results both in Israel and California have shown variability in effectiveness and more work is needed to define the RNase concentration necessary to completely inhibit pollen development. Plant transformation vectors expressing anti-sense apple S-RNase genes were constructed (USA) with an attempt to produce self compatible transgenic apple trees. Bovine S-Protein cDNA was cloned and successfully expressed in E. coli (Israel). Plant transformation vector expressing the S-Protein gene was constructed (USA) with an attempt to produce transgenic plants expressing S-protein in the style. Exogenous application of S-peptide to these plants will result in active RNase and consequently prevention of fertilization.
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Tel-Zur, Neomi, and Jeffrey J. Doyle. Role of Polyploidy in Vine Cacti Speciation and Crop Domestication. United States Department of Agriculture, January 2012. http://dx.doi.org/10.32747/2012.7697110.bard.

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1. Abstract: Over the past 25 years, vine cacti of the genera Hylocereus and Selenicereus have been introduced into Israel and southern California as new exotic fruit crops. The importance of these crops lies in their high water use efficiency and horticultural potential as exotic fruit crops. Our collaboration focused on the cytological, molecular and evolutionary aspects of vine cacti polyploidization to confront the agricultural challenge of genetic improvement, ultimately to improve success of vine cacti as commercial fruit crop plants. More specifically, we worked on the: 1- Identification of the putative ancestor(s) of the tetraploid H. megalanthus; 2- Determination of the number of origins of H. megalanthus (single vs. multiple origins of polyploidy); 3- Cytogenetic analysis of BC1 and F1 hybrids; 4- Determination of important agricultural traits and the selection of superior hybrids for cultivation. The plant material used in this study comprised interspecific Hylocereus F1 and first backcross (BC1) hybrids, nine Hylocereus species (58 genotypes), nine Selenicereus species (14 genotypes), and four Epiphyllum genotypes. Two BC1 hexaploids (BC-023 and BC-031) were obtained, a high ploidy level that can be explained only by a fertilization event between one unreduced female gamete from the triploid hybrid and a balanced gamete from the pollen donor, the diploid H. monacanthus. These findings are scientific evidence that support the possibility that “hybridization followed by chromosome doubling” could also occur in nature. Cytomixis, the migration of chromatin between adjacent cells through connecting cytoplasmatic channels, was observed in vine cacti hybrids and may thus imply selective DNA elimination in response to the allopolyploidization process. Evidence from plastid and nrDNA internal transcribed spacers (ITS) sequences support the placement of H. megalanthus within a monophyletic Hylocereus group. Furthermore, both plastid and ITS datasets are most consistent with a conclusion that this tetraploid species is an autopolyploid, despite observations that the species appears to be morphologically intermediate between Hylocereus and Selenicereus. Although the possibility of very narrow allopolyploidly (i.e., derivation from parents that are barely diverged from each other such as closely related species in the same genus) cannot be ruled out entirely based on our data (in part due to the unavailability of Hylocereus species considered to be morphologically the closest relatives of H. megalanthus), the possibility of H. megalanthus representing an intergeneric cross (i.e., Hylocereus × Selenicereus) seems extremely unlikely. Interestingly, the process of homogenization of ITS sequences (concerted evolution) is either incomplete or lacking in both Hylocereus and Selenicereus, and the inclusion of several artificial hybrids in the molecular study revealed the potential for biparental plastid inheritance in Hylocereus. The most important agricultural implication of this research project was the information collected for F1 and BC1 hybrids. Specifically, this project concluded with the selection of four superior hybrids in terms of fruit quality and potential yields under extreme high temperatures. These selected hybrids are self-compatible, avoiding the need for hand cross pollination to set fruits, thus reducing manpower costs. We recently offered these hybrids to growers in Israel for prioritized rapid evaluation and characterization.
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4

Eyal, Yoram, and Sheila McCormick. Molecular Mechanisms of Pollen-Pistil Interactions in Interspecific Crossing Barriers in the Tomato Family. United States Department of Agriculture, May 2000. http://dx.doi.org/10.32747/2000.7573076.bard.

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During the evolutionary process of speciation in plants, naturally occurring barriers to reproduction have developed that affect the transfer of genes within and between related species. These barriers can occur at several different levels beginning with pollination-barriers and ending with hybrid-breakdown. The interaction between pollen and pistils presents one of the major barriers to intra- and inter-specific crosses and is the focus of this research project. Our long-term goal in this research proposal was defined to resolve questions on recognition and communication during pollen-pistil interactions in the extended tomato family. In this context, this work was initiated and planned to study the potential involvement of tomato pollen-specific receptor-like kinases (RLK's) in the interaction between pollen and pistils. By special permission from BARD the objectives of this research were extended to include studies on pollen-pistil interactions and pollination barriers in horticultural crops with an emphasis on citrus. Functional characterization of 2 pollen-specific RLK's from tomato was carried out. The data shows that both encode functional kinases that were active as recombinant proteins. One of the kinases was shown to accumulate mainly after pollen germination and to be phosphorylated in-vitro in pollen membranes as well as in-vivo. The presence of style extract resulted in dephosphorylation of the RLK, although no species specificity was observed. This data implies a role for at least one RLK in pollination events following pollen germination. However, a transgenic plant analysis of the RLK's comprising overexpression, dominant-negative and anti-sense constructs failed to provide answers on their role in pollination. While genetic effects on some of the plants were observed in both the Israeli and American labs, no clear functional answers were obtained. An alternative approach to addressing function was pursued by screening for an artificial ligand for the receptor domain using a peptide phage display library. An enriched peptide sequence was obtained and will be used to design a peptide-ligand to be tested for its effect o pollen germination and tube growth. Self-incompatibility (SI) in citrus was studied on 3 varieties of pummelo. SI was observed using fluorescence microscopy in each of the 3 varieties and compatibility relations between varieties was determined. An initial screen for an S-RNase SI mechanism yielded only a cDNA homologous to the group of S-like RNases, suggesting that SI results from an as yet unknown mechanism. 2D gel electrophoresis was applied to compare pollen and style profiles of different compatibility groups. A "polymorphic" protein band from style extracts was observed, isolated and micro-sequenced. Degenerate primers designed based on the peptide sequence date will be used to isolate the relevant genes i order to study their potential involvement in SI. A study on SI in the apple cultivar Top red was initiated. SI was found, as previously shown, to be complete thus requiring a compatible pollinator variety. A new S-RNase allele was discovered fro Top red styles and was found to be highly homologous to pear S-RNases, suggesting that evolution of these genes pre-dated speciation into apples and pears but not to other Rosaceae species. The new allele provides molecular-genetic tools to determine potential pollinators for the variety Top red as well as a tool to break-down SI in this important variety.
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