Academic literature on the topic 'Alder Frankia'
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Journal articles on the topic "Alder Frankia"
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Hendrickson, O. Q., W. H. Fogal, and D. Burgess. "Growth and resistance to herbivory in N2-fixing alders." Canadian Journal of Botany 69, no. 9 (September 1, 1991): 1919–26. http://dx.doi.org/10.1139/b91-241.
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Fixation of atmospheric N2 may provide an advantage to woody plants in N-limited environments, but may also alter their resistance to herbivory. Studies in adjacent plantings of three North American shrub alders (Alnus spp.) and three Eurasian tree alders showed significant species differences in susceptibility to a leaf-mining sawfly (Fenusa dohrnii) and in response to inoculation with a N2-fixing actinomycete (Frankia). During the first 5 years, woody biomass production ranged from 0.3 t∙ha−1∙year−1 in Alnus viridis ssp. sinuata (Sitka alder) to 8.3 t∙ha−1∙year−1 in Alnus incana ssp. incana (grey alder). Grey alder and another tree species (Alnus japonica) were attacked infrequently and suffered little sawfly damage except in plots with poor growth. The tree species Alnus glutinosa (black alder) was attacked frequently, and sawfly damage was greatest in plots with the best growth. The shrub species Alnus viridis ssp. crispa (green alder) was also attacked frequently but was highly resistant to larval feeding. Frequently attacked species showed greater damage in the lower portion of the crown. Frankia inoculation increased green alder biomass by 87% but had no significant effect on grey alder or black alder. The concept of a growth-defense trade-off does not fully explain the interactions between Alnus spp. and F. dohrnii. Key words: Alnus, Fenusa dohrnii, Frankia, biomass production, plant–herbivore interactions, leaf miner.
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Bélanger, Pier-Anne, Jean-Philippe Bellenger, and Sébastien Roy. "Strong modulation of nutrient distribution in Alnus glutinosa as a function of the actinorhizal symbiosis." Botany 91, no. 4 (April 2013): 218–24. http://dx.doi.org/10.1139/cjb-2012-0184.
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Micro- and macro-nutrient acquisition by plants and microorganisms is a cornerstone for their survival and has a direct impact on biogeochemical cycling. In this study, we investigated, in controlled conditions, how the availability of exogenous nitrate impacted nutrient acquisition and distribution in black alder (Alnus glutinosa (L.) Gaertn.) in the presence, or absence, of its nitrogen-fixing bacterial symbiont (Frankia sp.). Our findings show that alder physiology and distribution of nutrients between aerial and root tissues were strongly influenced by the presence of the symbiont. In both nodulated and non-nodulated alders, root allocation and total plant biomass were positively correlated, except when nodulated alders were subjected to low nitrate conditions (≤15 ppm). Alders receiving 45 ppm exogenous nitrate had a less developed actinorhizal symbiosis. These findings reflect the importance of root exploration in relation to plant dependence to exogenous nitrate. Nutrient composition of alder aerial tissues, in particular molybdenum, was significantly altered in the presence of Frankia. In the context of plant leaf-litter mutualism involving metals and N exchange, our findings of high Mo and P translocation to shoots of non-nodulated alders underscores how the state of the symbiosis in actinorhizal plants can influence the biogeochemical cycling of elements.
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Huss-Danell, Kerstin, Per-Olof Lundquist, and Helene Ohlsson. "N2 fixation in a young Alnus incana stand, based on seasonal and diurnal variation in whole plant nitrogenase activity." Canadian Journal of Botany 70, no. 8 (August 1, 1992): 1537–44. http://dx.doi.org/10.1139/b92-193.
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N2 fixation by grey alder, Alnus incana (L.) Moench, was studied in the field during two growing seasons in northern Sweden. Alders were planted in a nitrogen-poor soil. Each alder had its root system enclosed in an open-ended cylinder that was closed with a gas-tight lid around the stem base to serve as cuvette during nitrogenase activity (acetylene reducing activity) measurements. To follow the seasonal variation, nitrogenase activity was measured at noon on 15 occasions for each alder in 1987 and on 15 occasions in 1988. Diurnal variation in nitrogenase activity was studied at six occasions, but no obvious pattern in the diurnal variation was found. Nitrogenase activity began shortly after leaf emergence at the very end of May, increased in June, stayed high although with some variation through July and August, declined during September, and was zero in early October. Cumulative nitrogenase activity over the season was converted to cumulative N2 fixation after determination of molar ratio nitrogenase activity to N2 fixation. This conversion was facilitated as the Frankia chosen as symbiont was lacking hydrogenase activity. Control experiments showed that the introduced symbiont was the only infective Frankia in the soil. N2 fixation was estimated to be 0.23 and 2.83 g N/(alder∙year) in the 1st and 2nd year, respectively. Despite its young age, A. incana was apparently capable of high N2 fixation rates at the high latitude studied. Key words: Alnus incana, hydrogenase, intact plants, N2 fixation, seasonal variation, spreading of Frankia.
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Welsh, Allana K., Jeffrey O. Dawson, Gerald J. Gottfried, and Dittmar Hahn. "Diversity of Frankia Populations in Root Nodules of Geographically Isolated Arizona Alder Trees in Central Arizona (United States)." Applied and Environmental Microbiology 75, no. 21 (September 4, 2009): 6913–18. http://dx.doi.org/10.1128/aem.01103-09.
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ABSTRACT The diversity of uncultured Frankia populations in root nodules of Alnus oblongifolia trees geographically isolated on mountaintops of central Arizona was analyzed by comparative sequence analyses of nifH gene fragments. Sequences were retrieved from Frankia populations in nodules of four trees from each of three mountaintops (n = 162) and their levels of diversity compared using spatial genetic clustering methods and single-nucleotide or 1, 3, or 5% sequence divergence thresholds. With the single-nucleotide threshold level, 45 different sequences with significant differences between the mountaintops were retrieved, with the southern site partitioning in a separate population from the two other sites. Some of these sequences were identical in nodules from different mountaintops and to those of strains isolated from around the world. A high level of diversity that resulted in the assignment of 14 clusters of sequences was also found on the 1% divergence level. Single-nucleotide and 1% divergence levels thus demonstrate microdiversity of frankiae in root nodules of A. oblongifolia trees and suggest a partitioning of diversity by site. At the 3 and 5% divergence levels, however, diversity was reduced to three clusters or one cluster, respectively, with no differentiation by mountaintop. Only at the 5% threshold level do all Frankia strains previously assigned to one genomic group cluster together.
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Russo, R. O., J. C. Gordon, and G. P. Berlyn. "Evaluating Alder-Endophyte (Alnus acuminata-Frankia- Mycorrhizae) Interactions." Journal of Sustainable Forestry 1, no. 1 (January 1, 1993): 93–110. http://dx.doi.org/10.1300/j091v01n01_06.
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Russo, Ricardo O. "Evaluating alder-endophyte (Alnus acuminata-Frankia-Mycorrhizae) interactions." Plant and Soil 118, no. 1-2 (August 1989): 151–55. http://dx.doi.org/10.1007/bf02232801.
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Huss-Danell, Kerstin, and Helene Ohlsson. "Distribution of biomass and nitrogen among plant parts and soil nitrogen in a young Alnus incana stand." Canadian Journal of Botany 70, no. 8 (August 1, 1992): 1545–49. http://dx.doi.org/10.1139/b92-194.
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Grey alder, Alnus incana (L.) Moench, was inoculated with the local source of Frankia and planted in nitrogen-poor soil in northern (63.8°N, 20.3°E) Sweden. Each alder root system was enclosed in a cylinder that served as an open-ended cuvette for nitrogenase activity measurements. The alders grew well, especially during the 2nd year of the study. The final leaf area in each season was more closely related to total alder biomass than final height of alders. The alders lost 17% of their total dry mass as leaf litter each year. This corresponded to 33 g dry mass and 0.67 g N per alder during the 2nd year. During the 2 years the soil N increment was 0.52 g N per alder. Leaf litter N and the increase in soil N corresponded to 27 and 17%, respectively, of the N2 fixed in the 2 years. Already at a young age, N2-fixing A. incana can apparently contribute to an improved fertility of N deficient soils. Key words: aboveground biomass, Alnus incana, belowground biomass, leaf litter, nitrogen content, soil N increment.
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Batzli, Janet McCray, and Jeffrey O. Dawson. "Development of flood-induced lenticels in red alder nodules prior to the restoration of nitrogenase activity." Canadian Journal of Botany 77, no. 9 (December 18, 1999): 1373–77. http://dx.doi.org/10.1139/b99-082.
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Red alder (Alnus rubra Bong.) is a nitrogen-fixing woody plant that is common on wetland sites and tolerates flooding through a variety of induced morphological and physiological changes. Among these changes are the formation of hypertrophied nodule lenticels and the subsequent full restoration of nitrogenase activity after 50 days of flooding. The objective of this study was to examine fine structural changes within red alder nodules during lenticel development that correspond to changes in nitrogenase activity during a 50-day experimental flood. Nodulated seedlings of red alder were grown under greenhouse conditions and then exposed to root flooding for 1, 20, 35, or 50 days. At each harvest, estimates of nitrogenase activity were made via acetylene reduction, and nodule samples were taken for light-microscope examination. Only after 50 days of flooding did red alder show restoration of nitrogenase to pretreatment levels. At this time, Frankia vesicles were found to be directly adjacent to developing lenticel tissue and large intercellular spaces. Intercellular space within the nodule increased from 0.6% in nonflooded tissue to 5.7% after 50 days of flooding. Our results demonstrate the sensitivity of the nitrogenase enzyme to low oxygen soil conditions and indicate that substantial morphological change within the nodule must occur before red alder can regain the capacity to fix nitrogen under flooded conditions.Key words: Alnus rubra, Frankia, waterlogged, biological nitrogen fixation, hypertrophied lenticels, intercellular space.
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GREITNER, CAROL S., and WILLIAM E. WINNER. "Effects of O3 on alder photosynthesis and symbiosis with Frankia." New Phytologist 111, no. 4 (April 1989): 647–56. http://dx.doi.org/10.1111/j.1469-8137.1989.tb02359.x.
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Roy, Melanie, Adrien C. Pozzi, Raphaëlle Gareil, Melissande Nagati, Sophie Manzi, Imen Nouioui, Nino Sharikadze, et al. "Alder and the Golden Fleece: high diversity of Frankia and ectomycorrhizal fungi revealed from Alnus glutinosa subsp. barbata roots close to a Tertiary and glacial refugium." PeerJ 5 (July 18, 2017): e3479. http://dx.doi.org/10.7717/peerj.3479.
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Background Recent climatic history has strongly impacted plant populations, but little is known about its effect on microbes. Alders, which host few and specific symbionts, have high genetic diversity in glacial refugia. Here, we tested the prediction that communities of root symbionts survived in refugia with their host populations. We expected to detect endemic symbionts and a higher species richness in refugia as compared to recolonized areas. Methods We sampled ectomycorrhizal (EM) root tips and the nitrogen-fixing actinomycete Frankia communities in eight sites colonized by Alnus glutinosa subsp. barbata close to the Caucasus in Georgia. Three sites were located in the Colchis, one major Eurasian climatic refugia for Arcto-Tertiary flora and alders, and five sites were located in the recolonized zone. Endemic symbionts and plant ITS variants were detected by comparing sequences to published data from Europe and another Tertiary refugium, the Hyrcanian forest. Species richness and community structure were compared between sites from refugia and recolonized areas for each symbionts. Results For both symbionts, most MOTUs present in Georgia had been found previously elsewhere in Europe. Three endemic Frankia strains were detected in the Colchis vs two in the recolonized zone, and the five endemic EM fungi were detected only in the recolonized zone. Frankia species richness was higher in the Colchis while the contrary was observed for EM fungi. Moreover, the genetic diversity of one alder specialist Alnicola xanthophylla was particularly high in the recolonized zone. The EM communities occurring in the Colchis and the Hyrcanian forests shared closely related endemic species. Discussion The Colchis did not have the highest alpha diversity and more endemic species, suggesting that our hypothesis based on alder biogeography may not apply to alder’s symbionts. Our study in the Caucasus brings new clues to understand symbioses biogeography and their survival in Tertiary and ice-age refugia, and reveals that isolated host populations could be of interest for symbiont diversity conservation.
Dissertations / Theses on the topic "Alder Frankia"
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Bajwa, Balwinder Singh. "Molecular charecterisation of Frankia and Alder- Frankia symbiosis in Eastern India." Thesis, University of North Bengal, 2004. http://hdl.handle.net/123456789/918.
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Harrington, John T. "Physiological effects of moisture stress, moisture stress conditioning, and leaf area manipulations on black alder seedlings (Alnus glutinosa (L.) Gaertn.)." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45674.
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This project consisted of three studies, two of which examined the effects of moisture deficits and moisture stress conditioning of black alder seedlings and the third examined the effects of shoot manipulations on the physiology of black alder seedlings and the nitrogenase activity of the seedlings' root nodules.
Endophyte strain was found to be nonsignificant in response to moisture deficit and moisture-stress conditioning (MSC). Using regression analysis MSC significantly decreased the impact of low water potentials on photosynthesis and acetylene reduction. There were no significant improvements in this response with increased MSC periods. Exposure of nodules to dry soil conditions while keeping the host plant hydrated did not significantly reduce acetylene reduction, nodule sugar content, transpiration or leaf conductance; however, photosynthesis was significantly reduced. Only defoliations of 100% significantly lowered acetylene reduction. Defoliations of 45% caused increases in photosynthesis and transpiration of residual leaves three days following defoliation. Nodule sugar content was unaffected by any level of defoliation.
Master of Science
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Mehta, Punita. "Evaluating the potential of alder-Frankia symbionts for the remediation and revegetation of oil sands tailings." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=84099.
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Tailings are the waste produced as a result of the extraction of oil from the tar sands in northern Alberta. Many avenues for the reclamation of tailings are being researched, but one area that has received little attention is phytoremediation. The Alder-Frankia symbiotic relationship in the tailings was investigated for its potential in revegetation and remediation of the tailings. Two species of alders were examined Alnus glutinosa and A. rugosa. The impact of the alders was monitored through the investigation of the differences in the microbial community present in the oil sands tailings and composite tailings (CT) with and without alders. For our investigation we used culture dependent techniques (plate counts and mineralization assays) and culture independent techniques (16S rRNA gene PCR, catabolic PCR and DGGE). The alders lowered the pH of the tailings, increased rates of mineralization, increased the general microbial population in the tailings by one to two orders of magnitude and increased the microbial diversity.A. rugosa however, had a greater impact on the mineralization of poly aromatic hydrocarbons (PAHs) and, being native to Alberta, was chosen for further experimentation, using only composite tailings. The aim of the experiments was to determine the effect of a Frankia inoculum on the growth of A. rugosa in (CT) and the associated microbial community. The microflora in the bulk soil, rhizosphere and inside the root of inoculated and non-inoculated A. rugosa were compared through microbial enumerations of the community, with general and selective media and mineralization assays. A. rugosa inoculated with Frankia was taller and the roots were more developed and the endophytic community of inoculated A. rugosa had greater rates of naphthalene mineralization.
The results indicate that A. rugosa inoculated with Frankia could be used for the phytoremediation of tailings and for the re-establishment of a forest ecosystem.
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Orfanoudakis, Michail. "Symbiotic relationships of Alnus glutinosa with arbuscular mycorrhizal fungi and with Frankia." Thesis, University of South Wales, 2003. https://pure.southwales.ac.uk/en/studentthesis/symbiotic-relationships-of-alnus-glutinosa-with-arbuscular-mycorrhizal-fungi-and-with-frankia(c70364aa-677c-4611-a733-ffd98314a733).html.
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The occurrence in Scotland of arbuscular mycorrhizal fungi (AMF) infective on Alnus glutinosa and the effects on early growth of inoculation of seedlings with AMF and Frankia were investigated. AMF characteristic of G/omiw-like fungi were detected microscopically in A. glutinosa roots from mineral and loam but not from highly organic soils. Both GJomus- and Gigaspora-like fungi were detected only in roots from sandy soils. Glasshouse experiments showed that Glomus and Gigaspora species gave higher colonisation of roots, and were of higher compatibility with the host plant, than Acutelospora or Scutettospora species. Colonisation by AMF increased nodulation by Frankia and vice versa. Inoculation with AMF alone and dual inoculation with Gigaspora rosea and Frankia inhibited growth of young A. glutinosa seedlings. Initially after inoculation, AMF colonisation was poor allowing the host to meet the requirements of both developing symbioses. Mycorrhizal plants inoculated with Frankia 15 days after AMF inoculation, were under significant stress and this delayed the beneficial effects of AMF and Frankia symbiosis. Seedlings compensated for the cost of symbiosis by developing a larger, leafy shoot in a period of 25-30 days after AMF inoculation, with or with out, Frankia nodulation. A significant increase in root length and branching detected after inoculation with AMF and Frankia must impose additional energy requirements. However, the stimulation of lateral root branching that follows AMF colonisation may facilitate nutrient uptake, thus helping the plant to overcome the disadvantages of early retardation of shoot growth. Competition with adjacent plant species for below ground space may also be enhanced thus facilitating competition for growing space with other plant species. These factors may be part of a strategy that assists the survival of very young seedlings in the field. The data obtained suggest that delaying Frankia inoculation for 3-4 weeks after inoculation with selected AMF should improve the production in Scottish nurseries of robust, well nodulated and mycorrhizal seedlings.
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Schwob, Guillaume. "Rôle écologique de la sporulation in-planta dans les symbioses actinorhiziennes : cas de la symbiose Alnus - Frankia." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1037/document.
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Les patrons de distribution chez les micro-organismes reposeraient sur leurs capacités à disperser dans le temps et dans l'espace, en lien avec des facteurs abiotiques comme les propriétés du sol, le climat, et des interactions biotiques, notamment avec l'hôte dans le cas des symbiontes, mais aussi sur les traits d'histoire de vie propres aux micro-organismes, telle que la capacité à sporuler. Frankia sp. est une actinobactérie sporulante et fixatrice d'azote à la biogéographie complexe, car vivant à la fois de façon saprophytique dans le sol, en symbiose racinaire (nodosité) avec les plantes actinorhiziennes dont les aulnes (Alnus, Betulaceae). Deux types de souches de Frankia génétiquement différentes ont été décrites dont la distinction phénotypique majeure réside dans la capacité à maintenir (Sp+) ou non (Sp-) leur sporulation in planta. Cette sporulation endophytique est à notre connaissance unique dans un contexte symbiotique et son implication dans la biogéographie de Frankia, reste peu connue. Ces travaux de thèse intègrent à la fois des approches descriptives et expérimentales, sur le terrain et au laboratoire, afin d'accroître la compréhension du rôle écologique de la sporulation in planta de Frankia. Dans un premier temps, nous avons étendu la description de la phylobiogéographie des souches de Frankia Sp+ afin de tester la validité du patron de distribution centré sur les milieux froids des zones de haute altitude et de haute latitude de l'hémisphère nord. Un intérêt tout particulier a été porté sur les aires géographiques où une plus forte diversité de Frankia était attendue, dans la zone d'origine de l'aulne et ses refuges glaciaires. Dans un second temps, nous avons étudié l'influence du partenaire végétal dans la distribution observée des Frankia Sp+ et l'implication du trait Sp+ dans la capacité d'association à l'hôte. Des croisements expérimentaux ont été réalisés au laboratoire afin de découpler les effets de l'espèce-hôte et du climat, et tester les implications du trait Sp+ en termes d'infectivité, compétitivité et spectre d'hôte. Enfin, nous avons étudié les conséquences écosystémiques de l'expansion subalpine du complexe symbiotique Alnus/Frankia, au niveau de la diversité microbienne et du fonctionnement du cycle de l'azote, en fonction du phénotype de sporulation des souches associées. Des analyses pédologiques, en association avec des mesures de nitrification, dénitrification et fixation d'azote, ainsi que des analyses de diversité microbienne (globale et fonctionnelle), ont été réalisées dans différentes aulnaies Sp+, Sp- ou mixte, à différents stades de colonisation de l'aulne. Les résultats obtenus démontrent une prédominance des souches Sp+ associées aux espèces d'aulne des milieux froids sur les 3 continents de la zone Holarctique, avec une diversité nouvelle dans l'aire d'origine et les zones refuges de l'aulne. Les croisements effectués révèlent une infectivité et compétitivité plus forte des Sp+ par rapport aux Sp-. De plus, contrairement aux Sp- à spectre d'hôte très large, les Sp+ présentent un spectre limité entraînant des incompatibilités d'association suggérant une dépendance forte à une espèce-hôte donnée. Les modifications des communautés microbiennes du sol en réponse à l'expansion du complexe symbiotique Alnus/Frankia ont été démontrées, en lien avec la stimulation du cycle de l'azote dans les milieux sub-/alpins. Les premiers résultats sur l'efficience comparée de la fixation d'azote in natura des souches Sp- par rapport aux Sp+ suggèrent que 100% de l'azote de l'aulne est obtenu par le biais de la fixation. Aucun patron n'est mis en évidence entre souches Sp+ et Sp-, suggérant un effet plus complexe de la saisonnalité, de l'âge de l'arbre et de celui de la nodosité. Les résultats obtenus nous permettent de mieux appréhender les facteurs guidant la biogéographie de Frankia et de discuter de l'évolution de ces patrons de distribution en réponse au réchauffement climatiqueMicrobial biogeography would be based on the ability of microorganisms to disperse across time and space, as a function of abiotic factors such as soil properties, climate, and of biotic interactions, in particular with the host in the case of symbionts, but also on life history traits such as the ability to sporulate. Frankia sp. is a spore-forming and nitrogen-fixing actinobacterium that has a complex biogeography given its abilities for both saprophytic life and root symbiotic interaction with actinorhizal plants such as alders (Alnus, Betulaceae). Two distinct groups of Frankia lineages have been described according to a major phenotypic divergence, based on the presence (Sp+) or the absence (Sp-) of spores in planta.. To the best of our knowledge, this endophytic sporulation is an original trait in a symbiotic context and very little is known about its incidence in Frankia biogeography. This work integrates descriptive and experimental approaches on both field and laboratory areas, in order to improve the understanding of the ecological role of Frankia in planta sporulation. First, we have extended the description of the phylobiogeography of Sp+ Frankia strains to validate the previously proposed distribution pattern focused on cold environements at high altitude or high latitude. A phylogeny has been computed using a large number of nodular strains coming from the 3 continents of the Northern Hemisphere and 10 different Alnus species. Special attention was paid to geographic areas where a higher diversity was expected, in Asia, and in its glacial refuges. Second, we studied the influence of the host-plant on the distribution of Fankia Sp+ and the incidence of Sp+ in the symbiotic interaction. Experimental crosses have been performed to disentangle host and climate effects and to test the incidence of the Sp+ trait in terms of infectivity, competitiveness and host-range. Finally, we studied the ecological consequences of the Alnus/Frankia symbiotic complex, on the microbial diversity and on the nitrogen cycle functionning, with respect to the sporulation of Frankia and to the Alnus expansion on sub-/alpine grasslands. Soils analyses were performed in association with measures of nitrification and denitrification, as well as global and functional microbial diversity analyses, in Sp+, Sp- or mixed alder stands and at different colonization stages. In each part of this work, alder ectomycorhizae were analyzed to compare the distribution pattern between the two symbionts and to highlight potential interactions with the Sp+ trait of Frankia. Our results show the dominance of Sp+ strains in nodules of alder species from cold environments over the 3 continents of the Holarctic zone, with original diversity patterns in alder area of origin and in glacial refuges. Even if these strains are genetically homogenous, host-specific clusters were observed in the phylogeny. Crosses revealed that Sp+ strains were more infective and competitive than Sp- strains. Moreover, unlike Sp- strains that harbor a wide host-range, Sp+ strains have a narrower specificity leading to association’s incompatibilities and suggesting strong host dependence. For the first time, modifications of microbial communities were revealed in response to the Alnus-Frankia symbiotic complex colonization and were linked to a stimulation of the nitrogen cycle in the sub-/alpine grasslands. The first comparative results of nitrogen fixation between Sp+ and Sp- strains in natura suggest a maximal efficiency of fixation, representing almost 100% of the alder nitrogen. However, unlike previous reports in literature, no pattern was observed between Sp+ and Sp- strains, suggesting a complex effect of seasonality, alder age as well as that of nodules. Altogether, the previous results contribute to a better understanding of the Frankia biogeography drivers and allow us to discuss the expected evolution of distribution pattern in response to the global warming
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Escobar, Jaramillo Paola. "Development, production and application of alder-Frankia symbionts for the remediation and revegetation of oil sands process affected material (OSPM) in Athabasca." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=110622.
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ABSTRACTSymbiotic alders are potential candidates for use in the remediation and revegetation of oil sands reclamation sites, and greenhouse inoculation has been shown to help ensure successful out-planting in the field. For successful nodule formation and growth, the time of inoculation (plant age) and N input are factors to be considered. In the present study, symbiosis was induced between Alnus crispa and Frankia strain AvcI1. Seedlings were grown, inoculated and exposed to different growing conditions that consisted of combining the presence or absence of Frankia, three different plant ages and five N treatments, to determine the best method for enhancing plant nodulation and growth. Results indicated that inoculation of 9-week-old seedlings with Frankia improved seedling growth, promoted nodule formation and ensured efficient N2 fixation. Fertilization with 100ppm of N was counterproductive for plant health, while the lower concentration of N, 10ppm, did not fulfill the N requirements of seedlings, suggesting the need to apply higher concentrations of N that do not surpass 100ppm. Greenhouse inoculated alders were subsequently used in a large-scale field trial to evaluate their ability to improve soil quality and metabolic activity of the indigenous microbial community in an oil sands reclamation site. In addition, the inoculated Frankia was monitored to determine if it remained present as part of the endophytic community in alder nodules. Results showed that inoculated alders were capable of very active growth, out performing non-inoculated plants, producing up to five-fold more biomass within the 3 growing season monitoring period. Alders also promoted the proliferation of heterotrophic and hydrocarbon degrading bacteria in the rhizosphere. Indigenous Frankia strains, that shared molecular similarities with the symbiont used in this study, were found in the nodules of non-inoculated alders, as well as in some of the soil samples indicating that a molecular detection approach requires further validation.RÉSUMÉLes aulnes symbiotiques ont un excellent potentiel pour la restauration et la re-végétalisation des anciens sites d'exploitation des sables bitumineux, et la pré-inoculation en serre a été démontrée comme aidant à assurer le succès de la plantation sur le terrain. Pour une croissance et une formation optimale des nodules, plusieurs facteurs sont à considérer : le moment de l'inoculation (âge de la plante) et les sourcesd'N. Dans la présente étude, Alnus crispa a été inoculé avec la souche Frankia AvcI1. Les semis ont été exposés à différentes conditions incluant la présence ou l'absence de Frankia, trois moment d'inoculation et cinq traitements d'N, afin de déterminer la meilleure méthode pour induire la nodulation des plantes et optimiser la croissance. Les résultats ont indiqué que l'inoculation avec Frankia à 9 semaines d'âge a amélioréla croissance des semis, la formation de nodules et la fixation de N2. La fertilisation avec 100 ppm d'N a été nocive pour la santé des plantes, tandis que la fertilisation avec 10 ppm d'N n'a pas remplis les besoins en azote des semis, ce qui suggère la nécessité d'appliquer des concentrations plus élevées d'N ne dépassant toutefois pas 100 ppm.Les semis d'aulnes inoculés en serre ont ensuite été utilisés dans un essai à grande échelle sur le terrain afin d'évaluer leur capacité à améliorer la qualité des sols et l'activité métabolique de la communauté microbienne indigène sur un ancien site d'exploitation des sables bitumineux. En outre, la souche de Frankia inoculée a été surveillée pour déterminer si elle est restée présente parmis la communauté endophyte des nodules d'aulne. Les résultats ont démontrés que les aulnes inoculés étaient capable d'une croissance beaucoup plus active que lesplantes non inoculées, produisant jusqu'à cinq fois plus de biomasse au cours des trois saisons de croissance de l'essai sur le terrain. Les aulnes ont aussi favorisé la prolifération des bactéries hétérotrophes et des bactéries dégradant les hydrocarbures leur rhizosphère. Dessouches de Frankia indigènes qui partageaient des similitudes moléculaires avec le symbiote utilisée dans cette étude, ont été retrouvées dans les nodules des aulnes non inoculés, ainsi que dans certains des échantillons de sol indiquant qu'une approche de détection moléculaire nécessite une validation plus poussée.
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Lefrançois, Elisabeth. "Revegetation and reclamation of oil sands process-affected material using «Frankia»-inocculated alders: field and greenhouse trials." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66758.
Full textAbstract:
Canada's oil sand industry produces substantial quantities of oil sands process-affected material (OSPM) including composite tailings (CT) and tailings sands (TS) that need to be reclaimed on site. This work evaluated the establishment of a pioneer plant species, alder, inoculated with a nitrogen-fixing actinomycete, Frankia. The main objectives were to evaluate alder performance in OSPM and its impact on soil characteristics and microbial community structure and function. This project was divided into two phases: a field study and a greenhouse trial. The greenhouse trial tested 2 alder species, Alnus glutinosa and A. crispa, in CT and TS. In addition to Frankia inoculation, a tripartite association with a mycorrhizal fungus, Glomus intraradices was evaluated. The field study consisted of a 2 year monitoring of Frankia-inoculated alders (A. crispa (Ait.) Pursh.) planted in TS capped with overburden material and peat moss. The parameters tested were the following: plant biomass and nitrogen content; soil chemical characteristics; microbial biomass; microbial petroleum hydrocarbon mineralization capability; and microbial community diversity and composition using the molecular techniques, PCR and DGGE. Alders performed well in OSPM and Frankia inoculation improved biomass acquisition. Frankia-alders improved a number of soil quality parameters such as pH, sodium content, and CEC. Frankia-alders presence modified soil microbial activity and diversity. Alder rhizosphere sustained more microbial biomass than unplanted soil, whereas the tripartite association did not provide additional benefits. Overall, Frankia-inoculated alders are an interesting biotechnological approach for the reclamation and revegetation of oil sand process-affected materials. Abbreviation: PCR (polymerase chain reaction), DGGE (Denaturating Gradient Gel Electrophoresis), CEC (Cation Exchange Capacity), TS (Tailings Sands), CT (CompositeL'exploitation des sables bitumineux d'Alberta par les compagnies pétrolières entraîne une importante production de matières résiduelles de sable bitumineux (MRSB). Ces MRSB, incluant les résidus de sable (RS) et les résidus composites ou consolidés (RC), doivent être réhabilités à même les sites d'exploitation. Ce projet a évalué l'utilisation d'une espèce pionnière, l'aulne, inoculée avec un actinomycète fixant l'azote, Frankia, pour la végétalisation de ces résidus. Les objectifs principaux étaient d'évaluer la performance des aulnes dans les MRSB et leurs impacts sur les caractéristiques du sol et ses communautés microbiennes. Le projet a été divisé en 2 volets : un essai sur le site minier et un essai en serre. L'essai en serre a évalué 2 espèces d'aulne, Alnus glutinosa et A. crispa, dans les RS et les RC. En plus de l'inoculation avec Frankia, une association tripartite avec un champignon mycorrhizien, Glomus intraradices, a été évaluée. L'essai sur le site minier a consisté en un suivi sur 2 ans d'aulnes (A. crispa (Ait.) Pursh.), inoculés avec Frankia, plantés dans des RS recouverts de morts-terrain et de mousse de tourbe. Les paramètres suivants ont été évalués : la biomasse et le contenu en azote des aulnes, les caractéristiques chimiques du sol, la biomasse microbienne, la capacité microbienne de minéralisation d'hydrocarbures pétroliers et, à l'aide de technique de biologie moléculaire (PCR et DGGE), la diversité et la composition des communautés microbiennes. Les aulnes ont bien performés dans les MRSB et l'inoculation avec Frankia a entraîné un important gain en biomasse. Les aulnes inoculés avec Frankia ont entraîné l'amélioration de plusieurs caractéristiques du sol, dont le pH, la CEC, et le contenu en sodium. Ils ont aussi modifié l'activité et la diversité des communautés microbiennes du sol. La rhizosphère des aulnes a$
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FEDERICO, LUCA. "L'apprendistato letterario di Raffaele La Capria." Doctoral thesis, Università degli studi di Genova, 2020. http://hdl.handle.net/11567/1005664.
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Superati «novant’anni d’impazienza» e dopo un lungo periodo votato all’autocommento e all’esplorazione delle proprie intenzioni, Raffaele La Capria ha raccolto le sue opere in due Meridiani curati da Silvio Perrella. La Capria ne ha celebrato l’uscita nella prolusione inaugurale di Salerno Letteratura, poi confluita nel breve autoritratto narrativo "Introduzione a me stesso" (2014). In questa sede, l’autore è tornato su alcuni punti essenziali della sua riflessione sulla scrittura, come la relazione, reciproca e ineludibile, fra tradizione e contemporaneità. All’epilogo del «romanzo involontario» di una vita, La Capria guarda retrospettivamente alla propria esperienza come ad un’autentica educazione intellettuale. Perciò, muovendo da un’intervista inedita del 2015, riportata integralmente in appendice, la tesi ha l’obiettivo di ricostruire l’apprendistato letterario di La Capria dai primi anni Trenta, quando l’autore ancora frequentava il ginnasio, fino all’inizio dei Sessanta, quando ottenne il premio che ne avrebbe assicurato il successo. Il percorso, che riesamina l’intera bibliografia lacapriana nella sua varietà e nella sua stratificazione, si articola in una serie di fasi interdipendenti: la partecipazione indiretta alle iniziative dei GUF (intorno alle riviste «IX maggio» e «Pattuglia»); l’incursione nel giornalismo e l’impegno culturale nell’immediato dopoguerra (sulle pagine di «Latitudine» e di «SUD»); l’attività di traduttore dal francese e dall’inglese (da André Gide a T.S. Eliot); l’impiego alla RAI come autore e conduttore radiofonico (con trasmissioni dedicate a Orwell, Stevenson, Saroyan e Faulkner); la collaborazione con «Il Gatto Selvatico», la rivista dell’ENI voluta da Enrico Mattei e diretta da Attilio Bertolucci; e le vicende editoriali dei suoi primi due romanzi, “Un giorno d’impazienza” (1952) e “Ferito a morte” (1961), fino alla conquista dello Strega. La rilettura dell’opera di uno scrittore semi-autobiografico come La Capria, attraverso il costante riscontro di fonti giornalistiche, testimonianze epistolari e documenti d’archivio che avvalorano e occasionalmente smentiscono la sua versione dei fatti, diventa allora un’occasione per immergersi nella sua mitografia personale e avventurarsi in territori finora poco esplorati: come la ricostruzione del suo profilo culturale, a partire dal milieu in cui La Capria vive e opera, o l’incidenza delle letture e delle esperienze giovanili sulla sua prassi letteraria.
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Martin, Kendall J. "Inoculation potential of soil-borne Frankia on red alder (Alnus rubra Bong.)." Thesis, 2001. http://hdl.handle.net/1957/32265.
Full textAbstract:
Inoculation trials were set up in fumigated nursery beds for red alder (Alnus
rubra Bong.) seedling production. Frankia inoculum was applied in eight treatments:
control, nodule suspension, and three levels of cell suspension (strain ArI5) applied
with and without a peat carrier. Seedlings were evaluated at midseason and lifting.
The peat inoculum treatment produced larger seedlings than the other treatments, both
at mid-season and at lifting. The other treatments had little effect on growth. Size
differences paralleled differences in degree of nodulation. Differences in percentage
of seedlings nodulated were most pronounced at midseason, indicating that the
inoculation conferred primarily an early-season advantage.
In a second nursery experiment, Frankia inoculum was applied in a peat mix
carrier, in four treatments: uninoculated control, strain ArI5, strain AvcI1, and
combined dual-inoculum. Seedlings were evaluated at midseason and at lifting.
Frankia DNA from nodules was analyzed by DNA fingerprinting. The controls were
poorly nodulated and grew slowly. The single strain inoculum for ArI5 produced
larger seedlings than for AvcI1, both at mid-season and at lifting. The dual-inoculum
treatment produced larger seedlings than all other treatments. The AvcI1 single-inoculum
nodules primarily produced fingerprints identical to AvcI1, but nodule
fingerprints from all other treatments were dominated by ArI5 patterns.
In a field experiment, nodulation capacity was determined for soils from red
alder stands in the Oregon coast range covering a wide span of ages. Total nitrogen,
total carbon, nitrate, ammonium and pH were measured on the same soil samples.
Soil pH was most highly correlated with nodulation potential, with nitrate content also
significant. Cluster analysis of the sites using these two variables produced two
groups with distinctly different nodulation capacities. The higher capacity cluster was
lower in nitrate and higher in pH than the majority of sites in the lower capacity
cluster. There was general overlap in the age ranges for the two groups but the lower
capacity cluster contained the oldest sites.Graduation date: 2002
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Rojas-Melo, Nestor S. "Influence of soil and rhizosphere actinomycetes on Frankia infection and nitrogenase activity in Alnus rubra Bong /." 1989. http://hdl.handle.net/1957/11067.
Full textBooks on the topic "Alder Frankia"
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Purin, Bernhard. "-- Ein Schatzkästlein alter jüdischer Geschichte": Die Sammlung Gundelfinger im Jüdischen Museum Franken. Fürth: Jüdisches Museum Franken, Fürth und Schnaittach, 1998.
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Rojas-Melo, Nestor S. Influence of soil and rhizosphere actinomycetes on Frankia infection and nitrogenase activity in Alnus rubra Bong. 1989.
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Rojas-Melo, Nestor S. Study of some biological and nutritional factors that influence nodulation by Frankia on red alder (Alnus rubra) and snowbrush (Ceanothus velutinus) within three age-class Douglas-fir forests in H.J. Andrews Experimental Forest, Oregon. 1997.
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Alter Ego Mthode De Franais. Hachette Fle, 2007.
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Alter Ego 4 Mthode De Franais. Hachette Fle, 2007.
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Alter Ego 2 Mthode De Franais. Hachette Fle, 2006.
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RODRIGUES, L. C. A., T. S. FROES, and P. Q. BORGES, eds. Interpretações do mito do Duplo. Mares Editores, 2020. http://dx.doi.org/10.35417/978-65-87712-08-6.
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Esta coletânea se dedica à reflexão sobre o mito do duplo, a relação entre o eu e o outro, marcada por traços de uma experiência de subjetividade ao considerar o fenômeno como um “alter ego”, um “segundo eu”, “aquele que caminha ao lado” ou um “companheiro de estrada”. Segundo Julio França (2009, p. 7-8, grifo do autor) “de modo bastante genérico, pode-se entender o duplo como qualquer modo de desdobramento do ser”, que “apesar de ser uma extensão do sujeito, [...] não abandona sua condição de simulacro, [...]. Afinal, no momento em que é gerado, já não pode mais ser confundido com o ‘eu’ original; possui uma essência própria e se assume necessariamente como ‘outro’.
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Yamamoto, Eric K. The 1980s Coram Nobis Cases. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190878955.003.0004.
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This chapter describes the Korematsu, Hirabayashi, and Yasui coram nobis reopenings of the World War II curfew and exclusion cases. The mid-1980s coram nobis courts made startling findings of egregious unethical misconduct at the government’s highest levels in justifying the curfew, removal, and incarceration. A cache of previously hidden World War II government documents revealed frantic efforts by War and Justice Departments leaders to deliberately mislead the Supreme Court and American public and to alter and fabricate key evidence on national security. The chapter enfolds Acting U.S. Solicitor General Neal Katyal’s unprecedented 2012 “Confession of Error” acknowledging the World War II solicitor general’s deliberate and prejudicial misrepresentations to the Supreme Court. It closes by highlighting the outcome of pervasive government disinformation on security and court passivity: the judiciary’s legal validation of the political branches’ prolonged deprivation of a vulnerable group’s liberty on an unfounded claim of urgent need.
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Harold, Claudrena N. When Sunday Comes. University of Illinois Press, 2020. http://dx.doi.org/10.5622/illinois/9780252043574.001.0001.
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When Sunday Comes charts the explosive growth of the gospel music industry between 1968 and 1994. It contextualizes the genre’s sonic innovations, theological tensions, and political assertions within the larger framework of the socioeconomic and cultural transformations taking place in black America during the post–civil rights era. Through an examination of such gospel legends as James Cleveland, Andraé Crouch, Shirley Caesar, the Clark Sisters, the Winans, Al Green, and Kirk Franklin, among others, the book explores the ways in which gospel music has provided an outlet for African Americans to express their spiritual, cultural, and regional identities. Organized chronologically, When Sunday Comes pivots around six principal questions: What were the major sonic transformations in gospel music between 1968 and 1994, and to what extent were those transformations reflective of creative shifts within other musical genres, particularly R&B, soul, funk, disco, and hip-hop? In what ways were gospel artists shaped by larger political developments in the United States, i.e., the rise and fall of the Black Power movement as well as the growing influence of the Moral Majority? To what degree were the soundscapes of gospel music reflective of regional dynamics? How did the political economy of the entertainment industry affect gospel artists’ commercial opportunities? And did the end of de jure racial segregation alter black artists’ relationship with the predominantly white contemporary Christian music industry?
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Böttger, Katrin, and Mathias Jopp, eds. Handbuch zur deutschen Europapolitik. Nomos Verlagsgesellschaft mbH & Co. KG, 2021. http://dx.doi.org/10.5771/9783748909514.
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Die vollständig überarbeitete Neuauflage des Handbuchs zur deutschen Europapolitik gibt einen tiefen Einblick in die Verflechtung Deutschlands mit der EU und arbeitet den Einfluss heraus, den Deutschland auf europäische Integrations- und Entscheidungsprozesse hat. Renommierte AutorInnen analysieren Grundlagen und Konzepte deutscher Europapolitik und ihre innenpolitischen Bestimmungsfaktoren in zentralen Politikbereichen der EU. Wichtige Neuerungen des Buches ergeben sich aus der vollständigen Überarbeitung und Aktualisierung aller Beiträge sowie aus einem Perspektivwechsel, der auch die Wahrnehmung deutscher Europapolitik in ausgewählten Partnerstaaten abbildet. Zudem wird die deutsche Europapolitik durch einen neuen abschließenden Beitrag in theoretischer Perspektive verortet. Der Band ist damit ein zuverlässiger Begleiter für Wissenschaft und Praxis und bietet eine solide Grundlage für alle, die sich nicht nur anlässlich der deutschen EU-Ratspräsidentschaft 2020 wissenschaftlich, politisch und praktisch mit deutscher Europapolitik auseinandersetzen möchten. Mit Beiträgen von Gabriele Abels, Peter Becker, Timm Beichelt, Ansgar Belke, Katrin Böttger, Simon Bulmer, Isabelle Buscke, Christian Calliess, Agnieszka Cianciara, Claire Demesmay, Gabriele D‘Ottavio, Christian Dreger, Katharina Gnath, Daniel Göler, Martin Große Hüttmann, Lucas Guttenberg, Ines Hartwig, Sven Hölscheidt, Rudolf Hrbek, Helge Jörgens, Mathias Jopp, Annette Jünemann, Henning Klodt, Wilhelm Knelangen, Barbara Lippert, Heiner von Lüpke, Andreas Maurer, Stormy-Annika Mildner, Gisela Müller-Brandeck-Bocquet, Oskar Niedermayer, Hans-Wolfgang Platzer, Nils Redeker, René Repasi, Michael Roth, Barbara Saerbeck, Frank Schimmelfennig, Roland Sturm, Funda Tekin und Thomas von Winter.
Book chapters on the topic "Alder Frankia"
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Martin, Kendall J., Nancy J. Posavatz, and David D. Myrold. "Nodulation potential of soils from red alder stands covering a wide age range." In Frankia Symbiosis, 187–92. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-1601-7_20.
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Myrold, David D., and Kerstin Huss-Danell. "Alder and lupine enhance nitrogen cycling in a degraded forest soil in Northern Sweden." In Frankia Symbiosis, 47–56. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-1601-7_6.
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Stowers, Mark D., and Jane E. Smith. "Inoculation and production of container-grown red alder seedlings." In Frankia and Actinorhizal Plants, 153–60. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5147-1_14.
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Côté, B., and C. Camiré. "Nitrogen cycling in dense plantings of hybrid poplar and black alder." In Frankia and Actinorhizal Plants, 195–208. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5147-1_18.
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Yamanaka, Takashi, Ching-Y. Li, Bernard T. Bormann, and Hiroaki Okabe. "Tripartite associations in an alder: effects of Frankia and Alpova diplophloeus on the growth, nitrogen fixation and mineral acquisition of Alnus tenuifolia." In Frankia Symbiosis, 179–86. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-1601-7_19.
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Prégent, G., and C. Camiré. "Biomass production by alders on four abandoned agricultural soils in Québec." In Frankia and Actinorhizal Plants, 185–93. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5147-1_17.
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Schlander, Michael, Ramon Schäfer, and Lorenz Selberg. "Einleitung." In Nutzen der Labormedizin in der Schweiz, 1–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2023. http://dx.doi.org/10.1007/978-3-662-66825-2_1.
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ZusammenfassungDie Laboratorien in der Schweiz erzielen eine Wertschöpfung von zwei Milliarden Schweizer Franken pro Jahr, beschäftigen 14.300 Mitarbeitende und verursachen weniger als drei Prozent der Leistungsausgaben der Obligatorischen Krankenpflegeversicherung (OKP). Die Labormedizin gilt nach verbreiteter Expertenmeinung als ausschlaggebend für rund 70 % aller klinischen Entscheide („70 %-Claim“). Gleichzeitig steht sie vor grossen Herausforderungen im Zusammenhang mit dem Siegeszug der evidenzbasierten Medizin (EBM), erhöhten regulatorischen Hürden für den Leistungsnachweis vor und nach erfolgter Zulassung, und rigorosen Überprüfungen des klinischen Nutzens und des Kosten/Nutzen-Verhältnisses labordiagnostischer Verfahren im Rahmen von Health Technology Assessments (HTAs).
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Sprakties, Gerhard. "Überlegungen zur Sinnfindung im Alter vor dem Hintergrund der sinn- und wertzentrierten Psychotherapie Viktor E. Frankls." In Happy-Aging statt Anti-Aging, 13–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-59414-8_2.
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Snyder, C. R., Kevin L. Rand, and David R. Sigmon. "Hope Theory A Member of the Positive Psychology Family." In Handbook of Positive Psychology, 257–76. Oxford University PressNew York, NY, 2001. http://dx.doi.org/10.1093/oso/9780195135336.003.0019.
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Abstract A new theory typically begins with the proponents offering a model that supposedly is more heuristic than the prevailing, older view. Our development of hope theory began in this manner. So, what was the accepted scholarly view of hope that we sought to alter? The perception that one’s goals can be attained was a common thread in the scholarly work that defined hope in the 1950s through 1960s (Cantril, 1964; Farber, 1968; Frank, 1975; Frankl, 1992; Melges & Bowlby, 1969; Menninger, 1959; Schachtel, 1959). Our hypothesis was that this view, although shared by many previous scholars, did not fully capture that which is involved in hopeful goal-directed thought.
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Alter, Peter. "Francis Ludwig Carsten 1911–1998." In Proceedings of the British Academy, Volume 115 Biographical Memoirs of Fellows, I. British Academy, 2003. http://dx.doi.org/10.5871/bacad/9780197262788.003.0006.
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Francis Carston FBA, fled from Nazi Germany in 1936, first to Amsterdam and then in 1939 to Wadham College, Oxford, eventually settling in London and becoming a British citizen in 1946. He taught German and Austrian history and wrote prolifically, most centrally on the crucial problem of Central European history in the twentieth century, why democracy had failed and what had prepared the way for fascism. Obituary by Peter Alter.
Conference papers on the topic "Alder Frankia"
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Timiri, Sai Chandra Mouli. "Rise and Decline of Languages: A Struggle for Survival." In GLOCAL Conference on Asian Linguistic Anthropology 2020. The GLOCAL Unit, SOAS University of London, 2020. http://dx.doi.org/10.47298/cala2020.3-3.
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Shifts in language presence are often predicated on the political and economic power of its users, where power level correlates with the longevity of the language. Further, during language contact, any resistance between the communities may lead to political and social conflict. The dominant language usually prevails, subjugating the weaker speech communities to the point where they adapt in various ways, processes which effect hegemonies. Language contact also motivates bilingualism, which takes effect over years. This paper suggests that, observing colonization through certain Asian countries, and centrally India, phonological influences have become conspicuous. Postcolonial contexts have selected language identities to assert local linguistic and sociocultural identities through specifying phonetic uniqueness. The study notes that economic trends alter this process, as do political factors. The study investigates how the role of English as an official language and lingua franca in India predicates the selection of certain phonetic patterns so as to legitimize identities of language communities. As such, Indian Englishes have developed their own unique varieties of language, through this process.