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

Glenn, S.; Rieck, C.E.

Weed Science 33(4): 452-456


ISSN/ISBN: 0043-1745
Accession: 004804145

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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.