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Type: Journal article
Title: Mechanisms in plant growth-promoting rhizobacteria that enhance the legume–rhizobial symbiosis
Author: Alemneh, A.
Zhou, Y.
Ryder, M.
Denton, M.D.
Citation: Journal of Applied Microbiology, 2020; 129(5):1133-1156
Publisher: Wiley
Issue Date: 2020
ISSN: 1364-5072
Statement of
A.A. Alemneh, Y. Zhou, M.H. Ryder and M.D. Denton
Abstract: Nitrogen fixation is an important biological process in terrestrial ecosystems and for global crop production. Legume nodulation and N₂ fixation have been improved using nodule‐enhancing rhizobacteria (NER) under both regular and stressed conditions. The positive effect of NER on legume–rhizobia symbiosis can be facilitated by plant growth‐promoting (PGP) mechanisms, some of which remain to be identified. NER that produce aminocyclopropane‐1‐carboxylic acid deaminase and indole acetic acid enhance the legume–rhizobia symbiosis through (i) enhancing the nodule induction, (ii) improving the competitiveness of rhizobia for nodulation, (iii) prolonging functional nodules by suppressing nodule senescence and (iv) upregulating genes associated with legume–rhizobia symbiosis. The means by which these processes enhance the legume–rhizobia symbiosis is the focus of this review. A better understanding of the mechanisms by which PGP rhizobacteria operate, and how they can be altered, will provide opportunities to enhance legume–rhizobial interactions, to provide new advances in plant growth promotion and N₂ fixation.
Keywords: ACC deaminase; IAA; N₂ fixation; nodule-enhancing rhizobacteria (NER); rhizobia
Rights: © 2020 The Society for Applied Microbiology
DOI: 10.1111/jam.14754
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Appears in Collections:Agriculture, Food and Wine publications
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