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Auxin like activity and metabolism of mefluidide in corn zea mays cultivar pioneer 3535 and soybean glycine max cultivar williams tissue



Auxin like activity and metabolism of mefluidide in corn zea mays cultivar pioneer 3535 and soybean glycine max cultivar williams tissue



Weed Science 33(4): 452-456



Mefluidide {N-[2,4-dimethyl-5-[[(trifluoromethyl)sulfonyl]amino]phenyl]acetamide} was evaluated for effects on corn coleoptile elongation. Mefluidide at 10-8 M, 10-7 M and 10-6 M stimulated elongation approximately equal to growth stimulations with 10-6 M IAA. Polar transport of 14C-IAA from donor agar blocks through corn coleoptiles and into receiver agar blocks after 12 h was increased 246% by 10-4 M mefluidide and inhibited 82% by 10-3 M mefluidide. Mefluidide-related chemicals (10-4 M) lacking a trifluoromethylsulfonyl-amino chain at the 1-position of the phenyl ring did not alter 14C-IAA tranport. IAA transport was increased 97% when the acetamide chain at the 5-position was absent and 255% when the methyl in the 4-position was absent, and it decreased 65% when the methyl at the 2-position was abent. Polar transport of 14C-IAA through soybean hypocotyls was not altered by 10-4 M mefluidide; however, 10-3 M mefluidide increased IAA transport 116%. After 6 h, corn coleoptides metabolized 14% of the mefluidide absorbed and soybean metabolized 54% of the mefluidide absorbed from 14C-mefluidide solutions (10-6 M). Differences in the rate of metabolism of mefluidide in meristematic tissue of corn and soybean may explain differences in mefluidide effects on auxin transport in corn and soybean.

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