Shared more. Cited more. Safe forever.
    • advanced search
    • submit works
    • about
    • help
    • contact us
    • login
    View Item 
    •   MOspace Home
    • University of Missouri-Columbia
    • Graduate School - MU Theses and Dissertations (MU)
    • Theses and Dissertations (MU)
    • Dissertations (MU)
    • 2006 Dissertations (MU)
    • 2006 MU dissertations - Access restricted to UM
    • View Item
    •   MOspace Home
    • University of Missouri-Columbia
    • Graduate School - MU Theses and Dissertations (MU)
    • Theses and Dissertations (MU)
    • Dissertations (MU)
    • 2006 Dissertations (MU)
    • 2006 MU dissertations - Access restricted to UM
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.
    advanced searchsubmit worksabouthelpcontact us

    Browse

    All of MOspaceCommunities & CollectionsDate IssuedAuthor/ContributorTitleIdentifierThesis DepartmentThesis AdvisorThesis SemesterThis CollectionDate IssuedAuthor/ContributorTitleIdentifierThesis DepartmentThesis AdvisorThesis Semester

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular AuthorsStatistics by Referrer

    Physiologic and metabolic interactions in the soybean/bradyrhizobium japonicum symbiosis

    Oehrle, Nathan Wayne, 1972-
    View/Open
    [PDF] public.pdf (63.58Kb)
    [PDF] short.pdf (62.08Kb)
    [PDF] research.pdf (3.802Mb)
    Date
    2006
    Format
    Thesis
    Metadata
    [+] Show full item record
    Abstract
    [ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] The agronomically vital, nitrogen-fixing symbioses between soybean and the soil bacterium Bradyrhizobium japonicum is a model system for the study of plant-microbe interactions. Its complexity extends from pre-infection and continues throughout the process. Emerging roots are the sites of infection and it was discovered that B. japonicum must compete for colonization with other inhabitants of the soil and those from the germinating seed. Through elimination of these parameters, attachment kinetics is found to occur in several phases, some lasting for only seconds, with minimal contact time resulting in maximal infection. After contact, the bacteria invade the root and form nodules on the root surface. As the nodule ages, the bacteria within these pockets begin the energy intensive process of providing nitrogen to the plant in exchange for a carbon and energy source. The effects of the environmental toxin trifluoroacetic acid (a breakdown product of the newest refrigerants: HCFCs) on this process demonstrate how important the health of the host plant is. B. japonicum is very resistant to the effects of the highly water soluble environmental toxin, however the soybean plant was not. The energy requirements of this process demand a healthy system and that nutrient transfer between the partners to be rapid and efficient. The possibility of carbon recycling during nitrogen fixation was also examined, demonstrating further the important role of alanine, pyruvate and possibly ethanol during peak nitrogen fixation. Most importantly, the knowledge gained from this study supports the theory of bacteroid alanine excretion during the soybean-Bradyrhizobium japonicum symbiosis.
    URI
    https://doi.org/10.32469/10355/5884
    https://hdl.handle.net/10355/5884
    Degree
    Ph. D.
    Thesis Department
    Biochemistry (Agriculture) (MU)
    Rights
    Access is limited to the campuses of the University of Missouri.
    Collections
    • Biochemistry electronic theses and dissertations (MU)
    • Biochemistry electronic theses and dissertations (MU)
    • 2006 MU dissertations - Access restricted to UM

    Send Feedback
    hosted by University of Missouri Library Systems
     

     


    Send Feedback
    hosted by University of Missouri Library Systems