Mode of Action of Naphthalic Acid as a Safener for Imazethapyr*
نویسنده
چکیده
Dale L. Shaner American Cyanamid Co., P.O. Box 400, Princeton, N.J., 08543-0400 U.S.A. Z. Naturforsch. 46c, 893-896 (1991); received March 26, 1991 Maize, Imidazolinone, Safeners, Naphthalic Acid, Naphthalic Anhydride, Metabolism The tolerance of maize to root-applied imazethapyr can be increased by pretreating plants with the potassium salt of naphthalic acid (NAK). This safening effect appears to be the result of NAK stimulating the ability of maize to rapidly metabolize imazethapyr to 5'-hydroxyethyl-imazethapyr, possibly through a mixed function oxidase. The safening effect of NAK can be antagonized by 1-aminobenzotriazole (ABT), a mixed function oxidase inhibitor. The increased rate of hydroxylation of imazethapyr to 5'-hydroxyethyl-imazethapyr immobilizes the herbicide in the root system which decreases the accumulation of herbicide in the meristematic tissue. This decreased accumulation, in turn, lowers the phytotoxicity of imazethapyr on maize.
منابع مشابه
Naphthalic Anhydride Induces Imazethapyr Metabolism and Cytochrome P-450 Activity in Maize*
Naphthalic anhydride is a seed-applied herbicide safener which reduces the toxicity of ima zethapyr, an imidazolinone herbicide, to maize (Zea mays L.). Protection of maize from ima zethapyr was dependent on the amount of naphthalic anhydride applied to the seed. M etabo lism of imazethapyr by maize roots and shoots was increased by exposure of the roots to a solution containing naphthalic a...
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