期刊
CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE
卷 82, 期 8, 页码 1186-1197出版社
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/B04-087
关键词
arbuscular mycorrhizal symbiosis; signaling; root exudates; Myc factor; respiration; lipid metabolism
During 400 million years of genome-genome interaction, plants and arbuscular mycorrhizal (AM) fungi have become highly interdependent, both ecologically and physiologically. As a result, the differentiation of a functional mycorrhiza is a multistep process requiring the active participation of both partners. During the presymbiotic stage of the AM interaction, some active molecules present in root exudates rapidly induce several fungal genes, in addition to stimulating important cellular and metabolic functions in the fungus, such as mitochondrial biogenesis and respiration. As a result of this activation, the fungus can use its lipidic reserves and reach further developmental stages. Subsequently, the fungus produces factors that induce new gene expression in roots. The fact that the partners of the AM symbiosis exchange such pheromonal active molecules during the presymbiotic stage of their interaction suggests the existence of other cross-signaling molecules during the symbiotic stage. These later signals might be involved in activating fungal fatty acid synthesis and sugar uptake or be responsible for specific plant gene induction. Now the challenge is to characterize the chemical nature and the exact role of these fungal and plant regulators in the AM symbiosis.
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