39. Glyphosate処理したペチュニア花弁の窒素代謝

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The changes of flower shape and pigmentation were observed in petunia corollas treated with 0.5mM glyphosate. The corollas treated with glyphosate increased free amino acid content to 136% of control. Free amino acid profiles in petunia corollas revealed that glyphosate had no significant effect on aromatic amino acid levels but increased level of proline. Soluble protein content in glyphosate-treated corollas did not cause any significant changes. The contents of soluble phenolics, lignin, IAA in the corollas were not significantly affected by glyphosate treatment. In contrast, glyphosate reduced the nitrate content of petunia corolla to 45% of control. And glyphosate reduced the RNA content of petunia corollas to 63% of control. However, the DNA content in glyphosate-treated corollas was similar to that of control. Low concentrations of glyphosate did not show any phytotoxic effects on the whole plants and any remarkable changes on aromatic amino acid metabolism and protein synthesis. However, glyphosate reduced RNA content of petunia corollas and changed flower symmetry from actinomorphic type to zygomorphic type. The results of nonprotein nitrogen metabolism in glyphosate-treated petunia corollas suggested that low concentration of glyphosate might effected on the regulation of the corolla growth and the flower symmetry through the reduction of RNA biosynthesis.
植物化学調節学会の論文
2005-10-13