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Дисертації з теми "Effect of gibberellins on"

Автор: Grafiati

Опубліковано: 4 червня 2021

Оновлено: 26 липня 2024

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1

Gxaba, Nomagugu. "The effect of exogenous growth regulators on salinity tolerance in Erucastrum strigosum." University of the Western Cape, 2003. http://hdl.handle.net/11394/8268.

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Magister Scientiae (Biodiversity and Conservation Biology) - MSc (Biodiv and Cons Biol)<br>Randomized block experiments were conducted to examine the putative amelioratory effects of kinetin or gibberellic acid at concentrations (0, 4, 12.5, 40, and 125 μM) in Erucastrum strigosum plants subjected to a salinity series (0, 100, 200, 300, and 400 mM NaCl) in the greenhouse. When the highest salinity concentration (increased stepwise) was reached, growth effects in relation to water and cation content of the plants were evaluated. Growth and water content were reduced progressively with sali

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2

Darwiche, Amal Omar 1964. "Effect of cytokinin, gibberellin, and nitrogen applications on the growth of eldarica pine seedlings." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/276979.

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A greenhouse experiment was conducted over a ninety day period to test the effect of different nitrogen fertilizer regimes and several application rates of compounds with gibberellin and cytokinin activity (GA4/7 and BA, respectively) on the growth and development of Pinus brutia var. eldarica. Nitrogen produced no significant effects and this was attributed to its abundance in the potting medium, to begin with. All levels of growth regulators used showed a highly significant effect on vegetative development. A reduction in root collar diameter, shoot elongation, needle nitrogen content and ov

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3

Rossouw, Jan Adriaan. "Effect of cytokinin and gibberellin on potato tuber dormancy." Diss., Pretoria : [s.n.], 2008. http://upetd.up.ac.za/thesis/available/etd-07302008-164519.

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4

Pound, William Eugene. "The effect of 1,1-dimethylaminosuccinamic acid (B-nine SP) on endogenous gibberellic acids in Chrysanthemum morifolium /." The Ohio State University, 1985. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487260859495302.

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5

Bezuidenhout, Johannes Jacobus. "Elucidating the dual physiological induced effect of gliotoxin on plants / Johannes Jacobus Bezuidenhout." Thesis, North-West University, 2011. http://hdl.handle.net/10394/6945.

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Fungi and Oomycetes represent the two most important groups of eukaryotic plant pathogens. Besides chemical and physical control of these pathogens, biological control is an approach enjoying increasingly more focus. One of the biological agents increasingly employed in biological control of plant pathogenic fungi is ironically the fungus Trichoderma, more specifically Trichoderma harzianum. Besides control of the fungal plant pathogens, another interesting aspect observed when plants are treated with Trichoderma harzianum are effects such as complete and even stand of plants, faster seed germ

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6

Loaring, Huw W. "Alkylation studies on the gibberellins." Thesis, University of Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338439.

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7

Harrison, Polly A. "Partial synthesis of selected gibberellins." Thesis, University of Bristol, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294577.

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8

Dickson, Ross L. "The effect of water stress, nitrogen and gibberellic acid on the phytotoxicity of post-emergent herbicides to Avena spp." Lincoln University, 1990. http://hdl.handle.net/10182/1283.

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A series of experiments was carried out on cultivated oat (Avena sativa L. cv Amuri) to examine the efficacies of fluazifop-butyl and glyphosate against water stressed plants, plants grown in low and high nitrogen and plants treated with gibberellic acid (GA₃). Avena sativa L. was used as a test plant and on completion of the experiments, further studies were carried out on the weed species wild oat (Avena fatua L.). In the laboratory, plants maintained at wilting point for five days before and nine days after spraying and treated with fluazifop-butyl (0.5 kg a.i./ha) appeared healthy 32 days

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9

Stokes, Tania Selvayogini. "Gibberellins and cytokinins in Rumex acetosa L." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621418.

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10

Huntley, Rachel Paula. "Cytokinins and gibberellins in oil palm sex determination." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388546.

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11

Nour, J. M. "The transport of gibberellins by cultured plant cells." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332612.

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12

Castellaro, Simon John. "Aspects of the chemistry and biosynthesis of gibberellins." Thesis, University of Bristol, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329885.

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13

Steenkamp, Emma Theodora. "Molecular taxonomic studies of selected species in the Gibberella fujikuroi complex." Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-06092006-114803/.

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14

Ertekin, Ozlem. "The Effect Of Indole Acetic Acid, Abscisic Acid, Gibberellin And Kinetin On The Expression Of Arf1 Gtp Binding Protein Of Pea (pisum Sativum L. Cv. Araka)." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608902/index.pdf.

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ADP Ribosylation Factor 1 (ARF1) is a universal small GTP binding protein which has an important role in vesicular trafficking between endoplasmic reticulum and Golgi. ARF1 is a basic component of Coat Protein I (COPI) vesicles which have functions in both formation of coatomer complex and recruitment of cargo proteins. In this study, the expression ARF1 was analyzed in pea (P. sativum L. cv. Araka) grown at different developmental stages. Because of the differential hormonal levels at corresponding stages, the effects of hormones on ARF1 expression were also studied. The results of present re

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15

Penny, Martin. "New methods for the syntheses of biologically important gibberellins." Thesis, University of Bristol, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386024.

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16

Boother, Gillian Margaret. "Gibberellins and genetic control of shoot growth in barley." Thesis, University of Bristol, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.330035.

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17

Doong, Tzyy-Jye. "Regulation of Gibberellin Metabolism by Environmental Factors in Arabidopsis Thaliana." Columbus, Ohio : Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1034085989.

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Thesis (Ph. D.)--Ohio State University, 2002.<br>Title from first page of PDF file. Document formatted into pages; contains xi, 148 p.; also contains graphics (some col.). Includes abstract and vita. Advisor: James Metzger, Dept. of Horticulture and Crop Science. Includes bibliographical references (p. 132-148).

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18

Holmes, Helen Frances. "The role of gibberellin in bolting in sugar beet." Thesis, University of Cambridge, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709529.

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19

Eriksson, Sven. "The role of gibberellins in the regulation of Arabidopsis flowering time /." Umeå : Dept. of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200693.pdf.

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20

Schauvinhold, Ines. "Influence of gibberellins on trichome initiation and secondary metabolism in tomato." Thesis, University of York, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.479511.

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21

Dolan, S. C. "The synthesis, characterisation and metabolism of some selected gibberellins and kaurenoids." Thesis, University of Bristol, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370825.

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22

Makinson, Ian Kenneth. "The synthesis and metabolism of some novel gibberellins and related compounds." Thesis, University of Bristol, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328232.

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23

Camut, Lucie. "Rôle des gibbérellines dans l’adaptation des plantes à la disponibilité en azote." Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAJ109.

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Les gibbérellines (GAs) sont des phytohormones régulant divers aspects de la croissance et du développement de la plante en réponse aux signaux endogènes et exogènes. Au niveau moléculaire, les GAs stimulent la dégradation des protéines DELLA, répresseurs nucléaires de croissance. L’azote (N), macronutriment essentiel au développement de la plante, représente un des facteurs les plus limitant pour la productivité agricole. Le nitrate (NO3-), principale source de N pour les plantes cultivées, est une molécule soluble dont la disponibilité varie dans l’espace et le temps. Depuis la Révolution Ve

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24

Buzzello, Gederson Luiz. "Uso de reguladores no controle do crescimento e no desempenho agronômico da cultura da soja cultivar CD 214 RR." Universidade Tecnológica Federal do Paraná, 2010. http://repositorio.utfpr.edu.br/jspui/handle/1/240.

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O acamamento de plantas provoca perdas significativas no rendimento de grãos da cultura da soja e por isso estratégias de manejo para minimizar o acamamento são importante necessidade na agricultura atual. O objetivo desse trabalho foi estudar ação de reguladores de crescimento vegetal sobre o acamamento e outras características agronômicas da cultivar de soja CD 214 RR, em épocas de semeadura e densidades distintas. Foram conduzidos dois experimentos na Estação Experimental da Universidade Tecnológica Federal do Paraná, Campus Pato Branco. No primeiro experimento foram testados diferentes reg

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25

Sarkar, Sunita. "Relationship between gibberellins, height and stress tolerance in barley (Hordeum vulgare L.) seedlings." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ56695.pdf.

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26

Felipo, Benavent Amelia. "Modulation of primary meristem activity by gibberellins through DELLA-TCP interaction in Arabidopsis." Doctoral thesis, Universitat Politècnica de València, 2017. http://hdl.handle.net/10251/82237.

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Plant development is an iterative process of organ formation from the primary meristems of the plant. Meristem activity is driven by dynamic transcriptional programs that determine cell fate and identity as cells are displaced trough the meristematic tissue to initiate organ primordia. This regulatory network includes members of the TCP and KNOX family of transcription factors, and integrates external and intrinsic cues to efficiently adapt meristem activity to an ever-changing environment. However, how this integration occurs is not clear yet. DELLA proteins have been proposed to modulate t

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27

Yan, Jia. "Effects of Gibberellin 2-oxidase, Phytochrome B1, and Bas1 gene transformation on creeping bentgrass photomorphogenesis under various light conditions." The Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1168027982.

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28

Björklund, Simon. "Plant hormones in wood formation : novel insights into the roles of ethylene and gibberellins /." Umeå : Dept. of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, 2007. http://epsilon.slu.se/200781.pdf.

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29

Silva, Rudieli Machado da. "Componentes da produção e produtividade da mandioca de mesa em função do arranjo de plantio e modos de aplicação de regulador de crescimento /." Botucatu, 2019. http://hdl.handle.net/11449/181549.

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Orientador: Adalton Mazetti Fernandes<br>Banca: Marcelo de Almeida Silva<br>Banca: Samuel Ferrari<br>Resumo: A importância econômica da mandioca (Manihot esculenta Crantz) está relacionada ao uso de suas raízes tuberosas na alimentação humana, animal e na produção de fécula e farinha, no entanto sua produção é limitada pela baixa produtividade média brasileira. Sistemas adensados de plantio são utilizados no aumento da produtividade da mandioca, porém com a obtenção de raízes menores e mais finas, devido à maior competição entre as plantas. Assim, a utilização de reguladores de crescimento pod

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30

Duvalsaint, Marvin Duvalsaint. "The Effects of Phytohormones and Isoprenoids in Dihydroartemisinin-induced Dormancy in the Erythrocytic Stages of Plasmodium falciparum." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6495.

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Our ability to control malaria has been challenged by increasing antimalarial resistance. Plasmodium falciparum undergoes dormancy in the blood stages which is hypothesized to be a means by which they are able to survive under drug pressure. This helps select for resistant parasites which grow following removal of drug. The mechanisms behind dormancy and the subsequent recrudescence are not fully understood but translating knowledge from related organisms which undergo a similar phenomenon might shed some light. Higher plants utilize dormancy during the early development stages to survive unde

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31

Dry, P. R. "Primary bud-axis necrosis of grapevines /." Title page, contents and summary only, 1986. http://web4.library.adelaide.edu.au/theses/09A/09ad798.pdf.

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32

Abbas, Mohamad. "The control of auxin homeostasis through the regulation of IAMT1 by DELLA proteins." Doctoral thesis, Universitat Politècnica de València, 2014. http://hdl.handle.net/10251/39348.

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The plant hormones gibberellins (GAs) and auxin display overlapping activities in the regulation of multiple developmental processes, including the differential growth that mediates the response to tropic stimuli and the formation of the apical hook. Several mechanisms have been proposed that explain the interaction between these two hormones, such as the regulation of auxin transport by GAs, and the regulation of GA biosynthesis by auxin. GAs are known to exert their action at the transcriptional level by promoting the degradation of DELLA proteins, which in turn interact with numerous transc

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33

Johnson, Kerry. "Photoperiod induction, Gibberellic acid, mulch and row cover effects on fresh cut flower production of three Rudbeckia hirta L. cultivars." Diss., Mississippi State : Mississippi State University, 2006. http://sun.library.msstate.edu/ETD-db/ETD-browse/browse.

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34

Wood, Nicholas D. "Studies towards the synthesis of mycinolide III, mycinoic acids I & II and 1β,2α-dimethyl gibberellins". Thesis, University of Bristol, 1996. http://hdl.handle.net/1983/1322f2e7-4563-4a44-991b-a4bf89a5c81b.

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35

Amaro, Amanda Cristina Esteves [UNESP]. "Respostas fisiológicas à aplicação de reguladores vegetais e nutrientes em videira ‘crimson seedless'." Universidade Estadual Paulista (UNESP), 2014. http://hdl.handle.net/11449/108724.

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Made available in DSpace on 2014-08-13T14:50:53Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-04-04Bitstream added on 2014-08-13T18:01:23Z : No. of bitstreams: 1 000766009.pdf: 2133283 bytes, checksum: ba937fe476457437b0b6e44206820ee8 (MD5)<br>O presente trabalho objetivou avaliar o efeito da aplicação foliar da mistura de auxina (Ax), citocinina (CK) e giberelina (GA), isolada ou combinada com a mistura de nutrientes, cobalto (Co) e molibdênio (Mo), em videira ‘Crimson Seedless’, buscando analisar seus efeitos na duração da atividade fotossintética das folhas e no metabolismo e des

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36

Amaro, Amanda Cristina Esteves 1985. "Respostas fisiológicas à aplicação de reguladores vegetais e nutrientes em videira 'crimson seedless' /." Botucatu : [s.n.], 2014. http://hdl.handle.net/11449/108724.

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Orientador: João Domingos Rodrigues<br>Banca: Elizabeth Orika Ono<br>Banca: Gisela Ferreira<br>Banca: Osvaldo Ferrarese Filho<br>Banca: Stella Consorte Cato<br>Resumo: O presente trabalho objetivou avaliar o efeito da aplicação foliar da mistura de auxina (Ax), citocinina (CK) e giberelina (GA), isolada ou combinada com a mistura de nutrientes, cobalto (Co) e molibdênio (Mo), em videira 'Crimson Seedless', buscando analisar seus efeitos na duração da atividade fotossintética das folhas e no metabolismo e desenvolvimento da planta, bem como no aumento da produção e qualidade de frutos. Os exper

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37

Barker, Whitnee Leigh. "Lateral Movement of Herbicides on Golf Course Fairways and Effects on Bentgrass Greens." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/9929.

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Concern has been raised that herbicides recently registered for use in warm-season turf to control perennial ryegrass could be dislodged from treated areas and deposited on neighboring cool-season grasses. In a field study, rimsulfuron was applied at 17.5 or 35 g ai/ha to perennial ryegrass in the afternoon; the following morning while dew was still present, a greens mower was driven through the perennial ryegrass and across adjacent creeping bentgrass. Irrigation had no effect on perennial ryegrass control but reduced visible track length and injury of neighboring creeping bentgrass. When tre

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38

Eriksson, Maria Elenor. "The role of phytochrome A and gibberellins in growth under long and short day conditions : studies in hybrid aspen /." Umeå : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2000. http://epsilon.slu.se/avh/2000/91-576-5898-6.pdf.

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39

Virtanen, E. (Elina). "Effects of haulm killing and gibberellic acid on seed potato (Solanum tuberosum L.) and techniques for micro- and minituber production in northern latitudes." Doctoral thesis, Oulun yliopisto, 2014. http://urn.fi/urn:isbn:9789526204178.

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Abstract Seed potato is the starting point in the potato (Solanum tuberosum L.) production chain. In order to secure potato production in a variety of production conditions, plant diseases must be controlled and the yield characteristics of the used cultivars ensured. In addition, production must be cost-effective. Characteristics particular to northern production conditions include long periods of daylight and a short growing season as well as a several months long seed potato storage period. The focus of the present study is on northern production conditions and methods, including haulm kill

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40

Dias, João Paulo Tadeu [UNESP]. "Etil-trinexapac em diferentes concentrações e épocas de aplicações no crescimento de figueira (Ficus carica L)." Universidade Estadual Paulista (UNESP), 2014. http://hdl.handle.net/11449/103297.

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Made available in DSpace on 2014-06-11T19:32:39Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-03-28Bitstream added on 2014-06-13T19:22:09Z : No. of bitstreams: 1 000757670.pdf: 1772920 bytes, checksum: ac3e161b26a22adc394755fc3cc1f63c (MD5)<br>Neste trabalho foram realizados três experimentos com o objetivo de estudar o efeito do regulador vegetal, etil-trinexapac, no crescimento e produção da planta de figueira (Ficus carica L.). O experimento 1 foi desenvolvido no período de 27 de agosto de 2011 a três de março de 2012 e o experimento 2, de 27 de agosto de 2012 a três de março de

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41

Dias, João Paulo Tadeu 1985. "Etil-trinexapac em diferentes concentrações e épocas de aplicações no crescimento de figueira (Ficus carica L) /." Botucatu :, 2014. http://hdl.handle.net/11449/103297.

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Orientador: Elizabeth Orika Ono<br>Banca: João Domingos Rodrigues<br>Banca: Giuseppina Pace Pereira Lima<br>Banca: Terezinha de Fatima Fumis<br>Banca: Aparecida Conceição Boliani<br>Resumo: Neste trabalho foram realizados três experimentos com o objetivo de estudar o efeito do regulador vegetal, etil-trinexapac, no crescimento e produção da planta de figueira (Ficus carica L.). O experimento 1 foi desenvolvido no período de 27 de agosto de 2011 a três de março de 2012 e o experimento 2, de 27 de agosto de 2012 a três de março de 2013. Os dois experimentos foram implantados em pomar comercial d

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42

Tenreira, Tracey. "Contrôle génétique et moléculaire du stolonnage : Balance entre reproduction sexuée et multiplication végétative chez le fraisier diploïde." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0415.

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Le fraisier diploïde (Fragaria vesca, 2x=14) comporte deux modes de reproduction : la reproduction sexuée via la floraison, et la multiplication végétative via la production de stolons. Cette espèce présente également deux types de floraison, non-remontants ou remontants, selon la période d’initiation florale du génotype. Chez le fraisier diploïde, le gène responsable de la remontée florale a été identifié comme étant l’homologue du répresseur floral TFL1 et celui du stolonnage reste inconnu. L’objectif de cette thèse est d’identifier le gène responsable du stolonnage et de mieux comprendre la

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43

Regnault, Thomas. "Biosynthèse et transport des gibbérellines chez Arabidopsis thaliana." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAJ098/document.

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Les gibbérellines (GA) sont une classe de phytohormones modulant différents aspects du développement des plantes. La biosynthèse des GA est catalysée par l’activité de différentes classes d’enzymes permettant la formation des formes bioactives. Si les mutants de biosynthèse sont nains, un excès de l’hormone provoque croissance excessive et stérilité. Ainsi, les plantes ont développé des mécanismes efficaces leur permettant de maintenir une concentration optimale de GA bioactives. Un niveau supplémentaire de régulation peut être constitué par une séparation spatiale de la biosynthèse dans diffé

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Fonouni-Farde, Camille. "Le rôle des gibbérellines dans la régulation de l’architecture racinaire chez la légumineuse modèle Medicago truncatula." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS079.

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L’architecture du système racinaire des légumineuses est déterminée par la croissance des racines et leur capacité à former des racines latérales et des nodosités symbiotiques fixatrices d’azote en fonction des conditions environnementales. Chez la légumineuse modèle Medicago truncatula, nous avons mis en évidence que les phytohormones gibbérellines (GAs) et leur voie de signalisation – médiée par trois protéines MtDELLAs présentant des profils d’expression redondants – jouent un rôle clé dans la régulation du développement du système racinaire. En conditions non-symbiotiques, les GAs régulent

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Saint, Germain Alexandre de. "Vers une meilleure compréhension du mode d’action des strigolactones et de leur interaction avec les autres hormones du développement." Thesis, Paris 11, 2012. http://www.theses.fr/2012PA112326/document.

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L'étude de la ramification chez le pois, à partir des mutants hyper-ramifiés ramosus (rms) a permis de mettre en évidence l'existence d'une nouvelle famille d'hormones végétales : les strigolactones, inhibant la ramification des plantes à graines. La découverte de cette hormone végétale ouvre de nouvelles pistes de recherche sur la biosynthèse et la perception de cette nouvelle hormone. Nous avons montré le rôle du gène PsBRC1, codant un facteur de transcription de type TCP et homologue du gène TEOSINTE BRANCHED1 du maïs, dans la voie de signalisation des strigolactones. L’étude de ce gène nou

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Rader, Gaurakisora D. "Blame and the Side-Effect Effect." Ohio University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1536758782159273.

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Harrison, Derek Laurie Shawn. "Bud development and the influence of gibberellins on the differentiation of reproductive buds in Pinus caribaea var. hondurensis." Phd thesis, 1987. http://hdl.handle.net/1885/143058.

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Hasan, O. "The effect of paclobutrazol on flowering activity and gibberellin levels in Eucalyptus nitens and Eucalyptus globulus." Thesis, 1993. https://eprints.utas.edu.au/17320/1/whole-Hasan-thesis.pdf.

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Experiments prior to this project demonstrated the capacity of the plant growth retardant paclobutrazol to enhance flowering in commercially important Eucalyptus nitens and E. globulus trees and produced anecdotal evidence of this material reducing time to first flowering. Paclobutrazol is known to reduce the levels of endogenous gibberellins (GAs) in several species and hence it was hypothesized that the effects of paclobutrazol on flowering in these Eucalyptus species may be mediated by an effect on GA levels. The lack of previous identification of GAs in this genus necessitated the d

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Ritchings, Bruce W. "Two studies on the developmental biology of the corngrass (Cg) mutation of maize (Zea mays L.) 1) the response of corngrass to exogenous application of two gibberellins : 2) the effect of daylength and temperature on expression of the corngrass phenotype /." 1987. http://catalog.hathitrust.org/api/volumes/oclc/17472635.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 1987.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 96-100).

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Kleingeld, Gerhard. "A comparison between the efficacy of radionically prepared gibberellic acid and homoeopathically prepared gibberellic acid (GHP) on the germination rate and seedling development of barley seeds." Thesis, 2016. http://hdl.handle.net/10321/1508.

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Submitted in partial compliance with the requirements of the Master’s Degree in Technology: Homoeopathy, Durban University of Technology, Durban, South Africa, 2016.<br>Aim The aim of this controlled, experimental study was to compare the biological activity of various homoeopathic potencies of gibberellic acid manufactured radionically (AMS transfer device) and conventionally (GHP) in terms of their respective influence on germination rate and seedling development of barley seeds; all the respective results being contrasted against those produced by the distilled water control. Methodology

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