54 メロン-アーバスキュラー菌根形成のリン酸栄養による調節におけるフラボノイド配糖体の関与

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Arbuscular mycorrhiza is the most widespread form of symbiotic associations between soilborne fungi in the order of Glomales and plant roots. This symbiosis confers benefits to tile host plant's growth and development through the acquisition of phosphate from the soil by the fungi. It was shown that the infection and intraradical growth of AM fungi are markedly inhibited in plant roots grown under high phosphate conditions possibly through phosphate-mediated physiological alterations of the roots. In order to better understand the role of secondary metabolites in the development and regulation of AM symbiosis, we investigated plant secondary metabolites that show a significant change in their levels during arbuscular mycorrhiza formation. So far, we had showed that a C-glycosylflavone, identified as isovitexin 2"-O-β-glucoside, significantly increased in melon roots grown under phosphate-limited condition, whereas no accumulation was observed in mycorrhizal roots and high phosphate-supplemented roots. Time course experiments showed that the compound started to accumulate from 30 days postinoculation and reached to 3.3 μg/g fresh weight at 40 days postinoculation in control roots. Its accumulation closely correlated with growth retardation of the plants observed from 30 days postinoculation. The flavonoid significantly stimulated mycorrhizal colonization in melon roots under low and high phosphate conditions when applied to the soil. These findings suggested that the phosphate deficiency-induced flavonoid is involved in the mechanism for phosphate-mediated regulation of AM fungal colonization in melon roots.
2001-10-09

54 メロン-アーバスキュラー菌根形成のリン酸栄養による調節におけるフラボノイド配糖体の関与

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