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Nodule Inception Is Not Required for Arbuscular Mycorrhizal Colonization of

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Journal Plants (Basel)
Date 2020 Jan 16
PMID 31935845
Citations 2
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Abstract

Most legumes can engage in symbiosis with N-fixing bacteria called rhizobia. This symbiosis, called nodulation, evolved from the more widespread symbiosis that most land plants form with arbuscular mycorrhiza, which is reflected in a common requirement of certain genes for both these symbioses. One key nodulation gene, (), has been intensively studied. Mutants in are unable to form nodules, which has made it difficult to identify downstream genes under the control of NIN. The analysis of data from our recent transcriptomics study revealed that some genes with an altered expression of during nodulation are upregulated in mycorrhizal roots. In addition, another study reported the decreased colonization of roots by arbuscular mycorrhiza. We therefore investigated a role for NIN in mycorrhiza formation. Our time course study, using two alleles with differing genetic backgrounds, suggests that that loss of NIN does not affect colonization of roots, either in the presence or absence of rhizobia. This, and recent phylogenetic analyses showing that the loss of NIN is correlated with loss of nodulation in the FaFaCuRo clade, but not with the ability to form mycorrhiza, argue against NIN being required for arbuscular mycorrhization in legumes.

Citing Articles

An LCO-responsive homolog of NODULE INCEPTION positively regulates lateral root formation in Populus sp.

Irving T, Chakraborty S, Maia L, Knaack S, Conde D, Schmidt H Plant Physiol. 2022; 190(3):1699-1714.

PMID: 35929094 PMC: 9614479. DOI: 10.1093/plphys/kiac356.


A mutant-based analysis of the establishment of Nod-independent symbiosis in the legume Aeschynomene evenia.

Quilbe J, Nouwen N, Pervent M, Guyonnet R, Cullimore J, Gressent F Plant Physiol. 2022; 190(2):1400-1417.

PMID: 35876558 PMC: 9516736. DOI: 10.1093/plphys/kiac325.

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