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NSP 1 is a component of the Myc signaling pathway
Author(s) -
Delaux PierreMarc,
Bécard Guillaume,
Combier JeanPhilippe
Publication year - 2013
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.12340
Subject(s) - medicago truncatula , biology , nod , transcription factor , nod factor , mutant , host (biology) , signal transduction , fungus , symbiosis , genetics , microbiology and biotechnology , colonization , gene , botany , root nodule , bacteria
SummaryNodulation and arbuscular mycorrhization require the activation of plant host symbiotic programs by Nod factors, and Myc‐ LCO s and CO s, respectively. The pathways involved in the perception and downstream signaling of these signals include common and distinct components. Among the distinct components, NSP 1, a GRAS transcription factor, has been considered for years to be specifically involved in nodulation. Here, we analyzed the degree of conservation of the NSP 1 sequence in arbuscular mycorrhizal ( AM ) host and non‐ AM host plants and carefully examined the ability of Medicago truncatula nsp1 mutants to respond to Myc‐ LCO s and to be colonized by an arbuscular mycorrhizal fungus. In AM ‐host plants, the selection pressure on NSP 1 is stronger than in non‐ AM host ones. The response to Myc‐ LCO s and the frequency of mycorrhizal colonization are significantly reduced in the nsp1 mutants. Our results reveal that NSP 1, previously described for its involvement in the Nod factor signaling pathway, is also involved in the Myc‐ LCO signaling pathway. They bring additional evidence on the evolutionary relatedness between nodulation and mycorrhization.