Effect Of Genetic Factors In Medicago On Symbiosis With Rhizobium
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Effect Of Genetic Factors In Medicago On Symbiosis With Rhizobium
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Author : James Davis Aughtry
language : en
Publisher:
Release Date : 1948
Effect Of Genetic Factors In Medicago On Symbiosis With Rhizobium written by James Davis Aughtry and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1948 with Medicago categories.
The Effect Of Genetic Factors In Medicago On Symbiosis With Rhizobium
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Author : James Davis Aughtry
language : en
Publisher:
Release Date : 1947
The Effect Of Genetic Factors In Medicago On Symbiosis With Rhizobium written by James Davis Aughtry and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1947 with Medicago categories.
Symbiotic Nitrogen Fixation
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Author : P. Graham
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Symbiotic Nitrogen Fixation written by P. Graham and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
During the past three decades there has been a large amount of research on biological nitrogen fixation, in part stimulated by increasing world prices of nitrogen-containing fertilizers and environmental concerns. In the last several years, research on plant--microbe interactions, and symbiotic and asymbiotic nitrogen fixation has become truly interdisciplinary in nature, stimulated to some degree by the use of modern genetic techniques. These methodologies have allowed us to make detailed analyses of plant and bacterial genes involved in symbiotic processes and to follow the growth and persistence of the root-nodule bacteria and free-living nitrogen-fixing bacteria in soils. Through the efforts of a large number of researchers we now have a better understanding of the ecology of rhizobia, environmental parameters affecting the infection and nodulation process, the nature of specificity, the biochemistry of host plants and microsymbionts, and chemical signalling between symbiotic partners. This volume gives a summary of current research efforts and knowledge in the field of biological nitrogen fixation. Since the research field is diverse in nature, this book presents a collection of papers in the major research area of physiology and metabolism, genetics, evolution, taxonomy, ecology, and international programs.
Intersection Of Salt Signaling With Nodule Initiation And Maturation During Medicago Truncatula Sinorhizobium Meliloti Symbiosis
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Author : Sanhita Chakraborty
language : en
Publisher:
Release Date : 2018
Intersection Of Salt Signaling With Nodule Initiation And Maturation During Medicago Truncatula Sinorhizobium Meliloti Symbiosis written by Sanhita Chakraborty and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
Legumes contribute significantly to sustainable agriculture because of their high protein content. This intrinsic nitrogen is the product of a mutualistic association between their roots, and a group of soil bacteria, collectively known as rhizobia. The rhizobium-legume symbiosis is a complex developmental process that involves rhizobial entry and differentiation, coupled in space and time, with the development of a root organ (the nodule) and is subject to modulation by environmental factors. Salt stress is a strong negative regulator of rhizobium-legume symbiosis, but despite its agricultural impact, the mechanism of salt regulation of rhizobium-legume symbiosis is poorly understood. This dissertation addresses this issue with focus on early rhizobium-legume signaling and maturation of nodules, using the model legume Medicago truncatula. The rhizobium-legume symbiosis is initiated with a molecular dialogue between the symbiotic partners, followed by the entry of rhizobia inside the host. These processes are under tight genetic regulation and involve the symbiotic induction of several host genes. I used a candidate gene-approach to locate the temporal intersection of salt and rhizobium-legume signaling and found that the ionic component of salinity hyperinduces Early Nodulin 11 (ENOD11) and ERF Required for Nodulation 1 (ERN1). I also found that the hyperinduction of ENOD11 requires two symbiotic rhizobial signals- Nod factors (NF) and succinoglycan and the host transcription factor Nodulation Signaling Pathway 2 (NSP2). In order to explore the possibility of an extensive transcriptional re-programming during rhizobium-legume signaling in the presence of salinity, I profiled the host root transcriptome and discovered strong transcriptional upregulation by salt, of several host genes associated with NF perception, rhizobial infection and ubiquitination. Curiously, I found that the hyperinduction of these genes correlate with an inhibition of rhizobial entry into the host. These findings highlight that early rhizobium-legume signaling and rhizobial colonization of the host are under tight transcriptional regulation of the host. Despite the early inhibition of infection, few nodules develop under salt stress. However, these nodules are morphologically abnormal, indicating that salinity must interfere with nodule maturation, a prerequisite for nitrogen fixation. Consistent with the theme of early symbiotic signaling, I found host genes involved during the early stages of nodule differentiation to remain highly expressed in nodules that developed under salt stress, suggesting a delay in maturation. This inference was further corroborated when I found that genes associated with the later stages of nodule development and nitrogen fixation showed decreased expression in the presence of salt. Additionally, I observed that this developmental shift of nodules under salinity was associated with differential accumulation of osmolytes, such as, proline betaine and homostachydrine in the salt-stressed nodules. Together, my work provides a mechanistic understanding of the intersection between nodulation and salt signaling, a question of major agricultural impact.
Technical Bulletin
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Author :
language : en
Publisher:
Release Date : 1981
Technical Bulletin written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Agriculture categories.
Nitrogen Fixation In Alfalfa
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Author :
language : en
Publisher:
Release Date : 1982
Nitrogen Fixation In Alfalfa written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Alfalfa categories.
Co Evolution Of Secondary Metabolites
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Author : Jean-Michel Mérillon
language : en
Publisher: Springer
Release Date : 2020-02-23
Co Evolution Of Secondary Metabolites written by Jean-Michel Mérillon and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-02-23 with Science categories.
This Reference Work is devoted to plant secondary metabolites and their evolutionary adaptation to different hosts and pests. Secondary metabolites play an important biological role in plants’ defence against herbivores, abiotic stresses and pathogens, and they also attract beneficial organisms such as pollinators. In this work, readers will find a comprehensive review of the phytochemical diversity, modification and adaptation of secondary metabolites, and the consequences of their co-evolution with plant parasites, pollinators, and herbivores. Chapters from expert contributors are organised into twelve sections that collate the current knowledge in intra-/inter-specific diversity in plant secondary metabolites, changes in secondary metabolites during plants’ adaptation to different environmental conditions, and co-evolution of host-parasite metabolites. Among the twelve themed parts, readers will also discover expert analysis on the genetics and chemical ecology evolution of secondary metabolites, and particular attention is also given to allelochemicals, bioactive molecules in plant defence and the evolution of sensory perception in vertebrates. This reference work will appeal to students, researchers and professionals interested in the field of plant pathology, plant breeding, biotechnology, agriculture and phytochemistry.
Technical Handbook On Symbiotic Nitrogen Fixation
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Author : Food and Agriculture Organization of the United Nations
language : en
Publisher: Food & Agriculture Org.
Release Date : 1993
Technical Handbook On Symbiotic Nitrogen Fixation written by Food and Agriculture Organization of the United Nations and has been published by Food & Agriculture Org. this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Technology & Engineering categories.
General information on the symbiotic nitrogen fixation. Isolation, identification and counting of rhizobia. Production of an inoculant and inoculation of legumes. Experiments.
Symbiotic Nitrogen Fixation In Plants
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Author : P. S. Nutman
language : en
Publisher: Cambridge University Press
Release Date : 1976-02-26
Symbiotic Nitrogen Fixation In Plants written by P. S. Nutman and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976-02-26 with Science categories.
Genetical aspects and taxonomy; Quality of legume inoculants; Field experiments on nitrogen fixation by nodulated legumes; Legume nitrogen fixation and the environment; Nitrogen fixing symbioses in non-leguminous plants.
Molecular And Cellular Mechanisms Of The Legume Rhizobia Symbiosis
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Author : Jianping Wang
language : en
Publisher: Frontiers Media SA
Release Date : 2019-02-19
Molecular And Cellular Mechanisms Of The Legume Rhizobia Symbiosis written by Jianping Wang and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-02-19 with categories.
The legume-rhizobia symbiosis is a remarkable biological phenomena, which is critically important for sustainable agriculture. In the past decades, significant progress has been made to understand the mechanisms of the symbiotic processes. In this eBook, we present the most recent researches focusing on the molecular mechanisms of legume-rhizobia symbiosis including rhizobium characters, plant response to different types of bacteria, phytohormones involved in the symbiosis, SYM pathway signals, and R genes and specificity of rhizobia infection. This eBook will be a great reference book highlighting the research frontiers in legume-rhizobia symbiosis.