Abstract
The symbiosis between rhizobial bacteria and leguminous plants is based on the exchange of specific signal molecules between both partners. The molecular basis of recognition of lipochitin oligosaccharide signal molecules that are secreted by these symbiotic bacteria has been revealed in recent reports. It was shown that specific recognition involves several family members of the serine/threonine receptor kinase family that contain LysM motifs in their extracellular domains. These LysM domain receptors appear to be crucial for the earliest responses of the host plant Lotus japonicus to infection by rhizobia. In another host plant, Medicago truncatula, it was shown that LysM domain receptors are also involved in specific recognition during later steps in bacterial infection.
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