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Open AccessBrief Report

Nodule Inception Is Not Required for Arbuscular Mycorrhizal Colonization of Medicago truncatula

1
National Key Laboratory of Plant Molecular Genetics, CAS-JIC Centre of Excellence for Plant and Microbial Science (CEPAMS), CAS Center for Excellence in Molecular and Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China
2
Cell and Developmental Biology, John Innes Centre, Norwich Research Park, Norwich NR4 7UH, UK
3
Shanghai Engineering Research Center of Plant Germplasm Resource, College of Life Sciences, Shanghai Normal University, Shanghai 200234, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally.
Plants 2020, 9(1), 71; https://doi.org/10.3390/plants9010071
Received: 2 December 2019 / Revised: 27 December 2019 / Accepted: 31 December 2019 / Published: 6 January 2020
(This article belongs to the Section Plant Genetics and Genomics)
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, Nodule Inception (NIN), has been intensively studied. Mutants in NIN 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 nin during nodulation are upregulated in mycorrhizal roots. In addition, another study reported the decreased colonization of nin roots by arbuscular mycorrhiza. We therefore investigated a role for NIN in mycorrhiza formation. Our time course study, using two nin alleles with differing genetic backgrounds, suggests that that loss of NIN does not affect colonization of Medicago truncatula 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. View Full-Text
Keywords: common symbiosis genes; Sinorhizobium meliloti; Rhizophagus irregularis common symbiosis genes; Sinorhizobium meliloti; Rhizophagus irregularis
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MDPI and ACS Style

Kumar, A.; Cousins, D.R.; Liu, C.-W.; Xu, P.; Murray, J.D. Nodule Inception Is Not Required for Arbuscular Mycorrhizal Colonization of Medicago truncatula. Plants 2020, 9, 71.

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