Effects of Glyphosate on Metabolism of Phenolic Compounds I. Induction of Phenylalanine Ammonia-lyase Activity in Dark-grown Maize Roots
نویسندگان
چکیده
The herbicide glyphosate, N-(phosphonomethyl)glycine, induced phenylalanine ammonia-lyase (PAL) activity in the roots of dark-grown maize seedlings. This enzyme induction was shown to precede glyphosate-reduced fresh weight gain in the roots by 24--48 h. Feeding aromatic amino acids with glyphosate further inhibited growth while slightly lowering glyphosate-enhanced PAL activity. Soluble protein levels in the enzyme preparations were not affected by glyphosate. These results are discussed in terms of possible glyphosate mode of action through stimulating biosynthesis of growth-inhibiting phenolics.
منابع مشابه
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