Abstract
A comparison study was conducted on the effect of glyphosate (N-[phosphonomethyl]glycine) on indole-3-[2-14C]acetic acid (IAA) metabolism, ethylene production, and growth of 7-day-old seedlings of different plants. The plants tested were American germander (Teucrium canadense L.), soybean (Glycine max L. Merr.), pea (Pisum sativum L. cv. Alaska and Little marvel), mungbean (Vigna radiata L.), and buckwheat (Fagopyrum esculentum Moench). A spray with 2 mM glyphosate affected IAA metabolism to a varied degree. The induced increase of IAA metabolism was greater in buckwheat, Alaska pea, and mungbean than soybean, Little marvel pea, and American germander. The increased IAA metabolism was correlated with the inhibition of growth and with the decrease of ethylene production.
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