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lüll Long-distance transport of signals during symbiosis: are nodule formation and mycorrhization autoregulated in a similar way?Staehelin C; Xie ZP; Illana A; Vierheilig HPlant Signal Behav 2011[Mar]; 6 (3): 372-7Legumes enter nodule symbioses with nitrogen-fixing bacteria (rhizobia), whereas most flowering plants establish symbiotic associations with arbuscular mycorrhizal (AM) fungi. Once first steps of symbiosis are initiated, nodule formation and mycorrhization in legumes is negatively controlled by a shoot-derived inhibitor (SDI), a phenomenon termed autoregulation. According to current views, autoregulation of nodulation and mycorrhization in legumes is regulated in a similar way. CLE peptides induced in response to rhizobial nodulation signals (Nod factors) have been proposed to represent the ascending long-distance signals to the shoot. Although not proven yet, these CLE peptides are likely perceived by leucine-rich repeat (LRR) autoregulation receptor kinases in the shoot. Autoregulation of mycorrhization in non-legumes is reminiscent to the phenomenon of "systemic acquired resistance" in plant-pathogen interactions.|Fabaceae/genetics/*metabolism/*microbiology[MESH]|Gene Expression Regulation, Plant/genetics/physiology[MESH]|Host-Pathogen Interactions[MESH]|Models, Biological[MESH]|Mycorrhizae/*physiology[MESH]|Signal Transduction/genetics/*physiology[MESH]|Symbiosis/genetics/*physiology[MESH] |