Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 119, Issue 51, Pages -Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2214703119
Keywords
Medicago; nodulation; symbiosis; specificity; receptors
Categories
Funding
- US Department of Agriculture/National Institute of Food and Agriculture Grant [2014-67013-21573]
- US National Science Foundation [IOS-1758037]
- US Department of Agriculture/Agricultural Research Service Non-Assistance Cooperative Agreement Grant [5850428003]
- Hungarian National Research, Development and Innovation Office Grants [K128486, K134841]
- China Scholarship Council
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Plants have evolved the ability to distinguish between symbiotic and pathogenic microbial signals. The NS1 locus in Medicago truncatula can block the invasion and nodule induction by Sinorhizobium meliloti. The NS1 locus is controlled by two genes, NS1a and NS1b, which can regulate the nodulation blockade of specific bacterial strains.
Plants have evolved the ability to distinguish between symbiotic and pathogenic microbial signals. However, potentially cooperative plant-microbe interactions often abort due to incompatible signaling. The Nodulation Specificity 1 (NS1) locus in the legume Medicago truncatula blocks tissue invasion and root nodule induction by many strains of the nitrogen-fixing symbiont Sinorhizobium meliloti. Controlling this strain -specific nodulation blockade are two genes at the NS1 locus, designated NS1a and NS1b, which encode malectin-like leucine-rich repeat receptor kinases. Expression ofNS1a and NS1b is induced upon inoculation by both compatible and incompatible Sinorhizobium strains and is dependent on host perception of bacterial nodulation (Nod) factors. Both presence/absence and sequence polymorphisms of the paired receptors contribute to the evolution and functional diversification of the NS1 locus. A bacterial gene, designated rns1, is required for activation of NS1-mediated nodulation restriction. rns1 encodes a type I-secreted protein and is present in approximately 50% of the nearly 250 sequenced S. meliloti strains but not found in over 60 sequenced strains from the closely related species Sinorhizobium medicae. S. meliloti strains lacking functional rns1 are able to evade NS1-mediated nodulation blockade.
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