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Acifluorfen Action on Growth and Phenolic Metabolism in Soybean (Glycine max) Seedlings

Published online by Cambridge University Press:  12 June 2017

Robert E. Hoagland
Robert E. Hoagland*
Affiliation:
South. Weed Sci. Lab., U.S. Dep. Agric., Agric. Res. Serv., Stoneville, MS 38776
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Abstract

Three-day-old soybean seedlings were treated with acifluorfen via liquid culture [50 μM in dark, 1 μM in light (200 μE·m–2·s–1)]. Root elongation in the dark was inhibited only slightly (6%) after 96 h. In the light, acifluorfen inhibited root elongation after 48 h; after 96 h, inhibition was 32%. Hypocotyl length was not affected in either the light or dark. Soluble hydroxyphenolic content per axis was unaffected in the dark but was reduced by about 13 to 25% at 24 to 96 h in the light. Extractable phenylalanine ammonia-lyase (PAL, EC 4.3.1.5) activity per axis was unaltered by herbicide in the dark. A brief transient increase in PAL activity (4 to 24 h) in axes of light-grown seedlings in the presence of acifluorfen was followed by reduced enzyme levels compared to light-grown controls at 72 and 96 h. Although light is required for maximal herbicide action, there was no effect on anthocyanin or chlorophyll accumulation or on the chlorophyll a/b ratio in hypocotyls or light-grown seedlings.

Keywords

Acifluorfen, 5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acidsoybean, Glycine max (L.) Merr. ‘Hill’Acifluorfendiphenyl ether herbicidesenzymeherbicide actionphenylalanine ammonialyase [EC 4.3.1.5]phenylpropanoid metabolismsoybean
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 37 , Issue 6 , November 1989 , pp. 743 - 747
Copyright
Copyright © 1989 by the Weed Science Society of America 

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