Relationship of Root Exudates of Soybean (Glycine Max) to Invasion and Nodulation by Rhizobium Japonicum PDF Download
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Author: David Heuston Hubbell
Publisher:
ISBN:
Category :
Languages : en
Pages : 61
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Book Description
Author: David Heuston Hubbell
Publisher:
ISBN:
Category :
Languages : en
Pages : 61
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Book Description
Author: Mary Christine Huber
Publisher:
ISBN:
Category : Ultrastructure (Biology)
Languages : en
Pages : 1202
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Book Description
As much as 80% of the seed protein found in soybean seeds can be attributed to the nitrogen-fixing activity of the microsymbiont, Bradyrhizobium japonicum, that resides in root nodules of soybean. The effectiveness of this combination is limited, however, and the duration of nitrogen fixation lasts only about 3 weeks. B. japonicum infects soybean roots by inducing formation of infection threads and cortical cell division centers that will form nodule primordia. Once this organism reaches these centers, it infects the cells by the process of endocytosis. The microsymbiont resides within them in a specialized structure, known as a symbiosome. In this study I examined ultrastructurally and biochemically the development of this symbiotic relationship by infecting the soybean cultivar Williams 82 with four closely-related strains of B. japonicum. I report here that symbiotic effectiveness (persistence of nitrogen fixation) is dependent upon the ability of these microorganisms both to infect and persist within the root nodule. I also present evidence that ultrastructurally observable host defense responses are correlated with limited infection potential and the early decline of nitrogen fixation.
Author: Farida Hassan Badawy
Publisher:
ISBN:
Category : Rhizobium japonicum
Languages : en
Pages : 404
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Author: Patrick Knowlton Worsham Howle
Publisher:
ISBN:
Category : Soybean
Languages : en
Pages : 266
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Author: Twng Wah Mew
Publisher:
ISBN:
Category : Soybean
Languages : en
Pages : 68
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Author: P. Graham
Publisher: Springer Science & Business Media
ISBN: 9401110883
Category : Science
Languages : en
Pages : 206
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Book Description
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.
Author: Alexander Neil Macgregor
Publisher:
ISBN:
Category : Legumes
Languages : en
Pages : 224
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Author: B.B. Biswas
Publisher: Springer Science & Business Media
ISBN: 1489917071
Category : Science
Languages : en
Pages : 455
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Book Description
Recent years have seen tremendous progress in unraveling the molecular basis of different plant-microbe interactions. Knowledge has accumulated on the mecha nisms of the microbial infection of plants, which can lead to either disease or resistance. The mechanisms developed by plants to interact with microbes, whether viruses, bacteria, or fungi, involve events that can lead to symbiotic association or to disease or tumor formation. Cell death caused by pathogen infection has been of great interest for many years because of its association with plant resistance. There appear to be two types of plant cell death associated with pathogen infection, a rapid hypersensitive cell death localized at the site of infection during an incompatible interaction between a resistant plant and an avirulent pathogen, and a slow, normosensitive plant cell death that spreads beyond the site of infection during some compatible interactions involving a susceptible plant and a virulent, necrogenic pathogen. Plants possess a number of defense mechanisms against infection, such as (i) production of phytoalexin, (ii) formation of hydrolases, (iii) accumulation of hydroxyproline-rich glycoprotein and lignin deposition, (iv) production of pathogen-related proteins, (v) produc tion of oligosaccharides, jasmonic acid, and various other phenolic substances, and (vi) production of toxin-metabolizing enzymes. Based on these observations, insertion of a single suitable gene in a particular plant has yielded promising results in imparting resistance against specific infection or disease. It appears that a signal received after microbe infection triggers different signal transduction pathways.
Author: Alexander P. Hansen
Publisher: Springer
ISBN: 3319649825
Category : Technology & Engineering
Languages : en
Pages : 348
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Book Description
This book provides in-depth reviews of the role of Rhizobium in agriculture and its biotechnological applications. Individual chapters explore topics such as: the occurrence and distribution of Rhizobium; phenotypic and molecular characteristics of Rhizobium; impact of Rhizobium on other microbial communities in the rhizosphere; N2-fixation ability of Rhizobium; Rhizobium and biotic stress; Rhizobium-mediated restoration of an ecosystem; in silico analysis of the rhizobia pool; further biotechnological perspectives of Rhizobium.
Author: Food and Agriculture Organization of the United Nations
Publisher: Food & Agriculture Org.
ISBN: 9789251031995
Category : Technology & Engineering
Languages : en
Pages : 202
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Book Description
General information on the symbiotic nitrogen fixation. Isolation, identification and counting of rhizobia. Production of an inoculant and inoculation of legumes. Experiments.
