除草剤glyphosateのエンドウ葉色素生合成に及ぼす影響

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Inhibition mechanism of pigment biosynthesis by the herbicide glyphosate was analysed using submerged leaf disks prepared from pea plants and the following results were obtained: ( 1 ) Although three kinds of aromatic amino acids were taken up by the plant along with the herbicide they could hardly alleviate the physiological and biochemical changes induced by the glyphosate treatment (Table 1 and Fig. 1). ( 2 ) Addition of precursors of pigment biosynthesis imperfectly alleviated the physiological and biochemical changes induced by the glyposate treatment. However the decrease in the content of chlorophylls and anthraquinones and the abnormal accumulation of shikimic acid in the presence of glyphosate could be alleviated by the addition of three kinds of aromatic amino acids, phosphoenolpyruvate and δ-aminolevulinic acid at the -same time (Table 1 and 2). ( 3 ) Methoxyphenone, which inhibited the final step of the biosynthesis of carotenoids, caused an abnormal accumulation of phytoene, phytofluene and ζ-carotene and also decreased the content of β-carotene. Glyphosate did not cause any abnormal accumulation of these compounds but decreased the content of β-carotene. It was thus assumed that the inhibition of carotenoid biosynthesis by the glyphosate treatment did not occur at the final step of this pathway (Table 3). ( 4 ) Incorporation of ^14C-acetyl Co A into each fraction of chlorophyll, carotene and xanthophyll was inhibited to the same extent by the glyphosate treatment (Fig. 2). ( 5 ) It was suggested that, in addition to the inhibition of 5-enolpyruvylshikimic acid-3-phosphate synthase, glyphosate inhibits metabolic sites at the initial stages of the biosynthesis of plant pigments.
日本雑草学会の論文
1986-05-26

除草剤glyphosateのエンドウ葉色素生合成に及ぼす影響

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