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Effect of Moisture Stress on Wild Oat (Avena fatua) Response to Diclofop

Published online by Cambridge University Press:  12 June 2017

William C. Akey  and
Ian N. Morrison
William C. Akey
Affiliation:
Dep. Plant Sci., Univ. of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
Ian N. Morrison
Affiliation:
Dep. Plant Sci., Univ. of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
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Abstract

The effect of moderate moisture stress on the activity of the methyl ester of diclofop {2-[4-(2,4-dichlorophenoxy)phenoxy] propanoic acid} applied to wild oat (Avena fatua L.) and the influence of morphological and physiological factors on the activity of the herbicide on stressed plants were investigated in growth-room experiments. Wild oat was grown in very fine sandy loam brought to a gravimetric soil moisture content (SMC) of 20% (water potential of -0.3 bars) or 10% (-6.5 bars) prior to herbicide treatment. The activity of diclofop on wild oat was slightly, but significantly, reduced when the SMC was increased from 10 to 20% immediately after spraying. Maintaining the SMC at 10% after spraying further reduced the activity of the herbicide. Wild oat plants grown at 20% SMC had 22% greater leaf area and retained 23% more herbicide than plants grown at 10% SMC. Penetration of the methyl ester of 14C-diclofop into wild oat grown at 20 or 10% SMC did not differ significantly 12, 24, or 48 h after application. Stressed and unstressed plants did not differ significantly in the metabolism of the methyl ester of 14C-diclofop. However, growth at a low SMC prior to treatment decreased the proportion of the radiolabeled herbicide recovered in the apex, third leaf, and tillers of wild oat. This may partially account for the reduced activity of this herbicide on wild oat subjected to moisture stress.

Keywords

Retentionpenetrationtranslocationmetabolismwater potential
Type
Research Article
Information
Weed Science , Volume 31 , Issue 2 , March 1983 , pp. 247 - 253
Copyright
Copyright © 1983 Weed Science Society of America 

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