66(P-43) 青色光によって誘導される成長抑制物質の構造と高等植物の光屈性における役割(ポスター発表の部)

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Seedlings of higher plants orient their growth with regard to the direction of light in order to optimize the exposure of their photosynthetic leaves. This plant movement is called phototropism. We have hitherto reported evidence that the differential flank growth that causes phototoropic curvature is regulated by a local gradient induced at the site of illumination, of blue light-induced growth inhibitors interfering with the action of evenly distributed auxin (Bruinsma-Hasegawa theory). To date, different plant species turn out to produce different and very specific growth inhibitors as candidate(s) for phototropism-regulating substance(s), raphanusanins and 4-methylthio-3-butenyl-isothiocyanate for radish hypocotyls, benzoxazolinones for maize. coleoptiles, and 8-epixanthatin for sunflower hypocotyls. We have isolated some photo-induced growth inhibitory substances related to phototropism, 2-(2,4-dihydroxy-7-methoxy-2H-1,4-benzoxazin-3(4H)-one) from maize shoots (Zea mays L.) and wheat coleoptiles (Triticum aestivum L.), Avenacoside B and Isovitexin-2"-O-α-L-arabino-pyranoside from oat coleoptiles (Avena sativa L.), and Indole-3-carboxylic acid from Arabidopsis thaliana shoots. Chemical analyses have shown phototropic stimulations to cause curvature by inducing a local unequal distribution of growth-inhibiting substances that antagonize auxin in its cell-elongating activity. Finally, the plausible mechanism of phototropism in higher plants is described in Scheme 2.
天然有機化合物討論会の論文
2002-09-01

66(P-43) 青色光によって誘導される成長抑制物質の構造と高等植物の光屈性における役割(ポスター発表の部)

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