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    • Journal of Range Management, Volume 47 (1994)
    • Journal of Range Management, Volume 47, Number 3 (May 1994)
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    Indications of associative nitrogen fixation in eastern gamagrass

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    Author
    Brejda, J. J.
    Kremer, R. J.
    Brown, J. R.
    Issue Date
    1994-05-01
    Keywords
    nitrogenase
    nitrogen-fixing bacteria
    soil bacteria
    nitrogen fixation
    enzyme activity
    Tripsacum dactyloides
    soil
    roots
    Missouri
    Panicum virgatum
    
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    Citation
    Brejda, J. J., Kremer, R. J., & Brown, J. R. (1994). Indications of associative nitrogen fixation in eastern gamagrass. Journal of Range Management, 47(3), 192-195.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644416
    DOI
    10.2307/4003014
    Additional Links
    https://rangelands.org/
    Abstract
    Associative nitrogen-fixation is one mechanism by which plants can meet a portion of their nitrogen (N) needs in N deficient environments. Eastern gamagrass [Tripsacum dactyloides (L.) L.] grows under conditions conducive for associative N-fixation. Our objective was to evaluate eastern gamagrass roots for nitrogenase activity and associated N-fixing bacteria, and compare its nitrogenase activity to switchgrass (Panicum virgatum L.). Soil and root samples were collected from unfertilized stands of "PMK-24" eastern gamagrass at 3 locations in northern Missouri and nitrogenase activity measured using the acetylene reduction method. Eastern gamagrass roots supported greater nitrogenase activity when colonized by indigenous bacteria, compared to roots inoculated with Klebsiella pneumoniae or surface sterilized. Eastern gamagrass roots colonized by indigenous bacteria had 17-46 fold greater nitrogenase activity than switchgrass roots. Bacterial composition on eastern gamagrass roots was dominated by fluorescent pseudomonads and Pseudomonas cepacia, with lower populations of other bacteria. Bacterial composition from incubation tubes showing nitrogenase activity was similar to that found on the roots, except that the diazotrophic bacterium Azospirillum braziliense was isolated from 1 of 3 sites. The potential for associative N-fixation with eastern gamagrass warrants further study and in situ measurement to quantify rates of N fixation.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003014
    Scopus Count
    Collections
    Journal of Range Management, Volume 47, Number 3 (May 1994)

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