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Physiological Basis for Differential Bentazon Susceptibility Among Corn (Zea mays) Inbreds

Published online by Cambridge University Press:  12 June 2017

Laura D. Bradshaw ,
Michael Barrett  and
Charles G. Poneleit
Laura D. Bradshaw
Affiliation:
Dep. Agron., Univ. Kentucky, Lexington, KY 40546-0091
Michael Barrett
Affiliation:
Dep. Agron., Univ. Kentucky, Lexington, KY 40546-0091
Charles G. Poneleit
Affiliation:
Dep. Agron., Univ. Kentucky, Lexington, KY 40546-0091
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Abstract

Experiments were conducted to confirm the bentazon susceptibility of corn inbred GA209 and determine the physiological basis of this susceptibility. Bentazon (1.1 to 4.4 kg ha-1) plus crop oil concentrate (1% by vol) did not cause visible injury or dry weight loss of corn inbred B73 but caused 66 to 89% visual injury and 62 to 70% dry weight reduction of GA209 1 wk after treatment. Bentazon (2.2 kg ha-1) inhibited variable chlorophyll fluorescence decay in GA209 and B73 8 h after treatment. Variable fluorescence decay recovered in B73, but not in GA209, 96 h after treatment. Absorption and translocation of 14C from 14C-bentazon was greater in GA209 than B73 during a 48-h time course. Both inbreds converted bentazon to a polar metabolite which formed 6-hydroxybentazon upon hydrolysis with β-glucosidase. However, 63% of absorbed 14C from 14C-bentazon remained in the parent form in GA209 compared to 25% in B73 over a 72-h time course. A decreased ability of GA209 to metabolize bentazon may explain bentazon sensitivity of this inbred compared to B73.

Keywords

Bentazon, 3-(1-methylethyl)-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxidecorn, Zea mays L. GA209, B73Uptakemetabolismtranslocationselectivity
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 40 , Issue 4 , December 1992 , pp. 522 - 527
Copyright
Copyright © 1992 by the Weed Science Society of America 

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