Strategies used by rhizobia to lower plant ethylene levels and increase nodulation

Ma, Wenbo, Penrose, Donna M. and Glick, Bernard R. (2002) Strategies used by rhizobia to lower plant ethylene levels and increase nodulation. Canadian Journal of Microbiology, 48 (11). pp. 947-954. ISSN 0008-4166

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Agriculture depends heavily on biologically fixed nitrogen from the symbiotic association between rhizobia and plants. Molecular nitrogen is fixed by differentiated forms of rhizobia in nodules located on plant roots. The phytohormone, ethylene, acts as a negative factor in the nodulation process. Recent discoveries suggest several strategies used by rhizobia to reduce the amount of ethylene synthesized by their legume symbionts, decreasing the negative effect of ethylene on nodulation. At least one strain of rhizobia produces rhizobitoxine, an inhibitor of ethylene synthesis. Active 1-aminocyclopropane-1-carboxylate (ACC) deaminase has been detected in a number of other rhizobial strains. This enzyme catalyzes the cleavage of ACC to α-ketobutyrate and ammonia. It has been shown that the inhibitory effect of ethylene on plant root elongation can be reduced by the activity of ACC deaminase.

Item Type: Article
Uncontrolled Keywords: acc deaminase,ethylene,nodulation,rhizobia,rhizobitoxine,microbiology,immunology,applied microbiology and biotechnology,molecular biology,genetics ,/dk/atira/pure/subjectarea/asjc/2400/2404
Faculty \ School: Faculty of Science > The Sainsbury Laboratory
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Depositing User: LivePure Connector
Date Deposited: 12 Sep 2022 12:31
Last Modified: 21 Oct 2022 01:41
DOI: 10.1139/w02-100

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