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Erik Limpens,Carolien Franken,Patrick Smit,Joost Willemse,Ton Bisseling,*René Geurts
The rhizobial infection of legumes has the most stringent demandtoward Nod factor structure of all host responses, and thereforea specific Nod factor entry receptor has been proposed. TheSYM2 gene identified in certain ecotypes of pea (Pisum sativum)is a good candidate for such an entry receptor. We exploitedthe close phylogenetic relationship of pea and the model legumeMedicago truncatula to identify genes specifically involvedin rhizobial infection. The SYM2 orthologous region of M. truncatulacontains 15 putative receptor-like genes, of which 7 are LysMdomaincontaining receptor-like kinases (LYKs). Usingreverse genetics in M. truncatula, we show that two LYK genesare specifically involved in infection thread formation. This,as well as the properties of the LysM domains, strongly suggeststhat they are Nod factor entry receptors.
Laboratory of Molecular Biology, Department of Plant Sciences, Wageningen University, Dreijenlaan 3, 6703HA, Wageningen, Netherlands.
* To whom correspondence should be addressed. E-mail: ton.bisseling{at}wur.nl
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