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Physiological Study on Bentazon Tolerance in Inbred Corn (Zea mays)

Published online by Cambridge University Press:  20 January 2017

Chih-Ming Wu  and
Ching-Yuh Wang
Chih-Ming Wu
Affiliation:
Department of Agronomy, National Chung-Hsing University, 250 KuoKuang Road, Taichung, Taiwan, ROC
Ching-Yuh Wang*
Affiliation:
Department of Agronomy, National Chung-Hsing University, 250 KuoKuang Road, Taichung, Taiwan, ROC
*
Corresponding author's E-mail: [email protected]
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Abstract

At 10.4 mM bentazon treatment, the tolerance index of susceptible (S) inbred corn, line TN89, at one-leaf stage decreased to 27% of that of the control, whereas > 90% of tolerance index of control was maintained in tolerant (T) line LU21. More than fourfold of malondialdehyde (MDA) accumulated in S line within 7 d after treatment (DAT), but only a slight accumulation of MDA was found in T line. 14C-Bentazon application experiment indicated that there was no difference in bentazon absorption between T and S lines. However, bentazon metabolism in T line was more active than that in susceptible TN89. The metabolite, 6-glucose-bentazon in T line rapidly accumulated to the maximum 3 DAT, whereas this conjugate actually decreased in S line. Assay of in vitro activity of bentazon-6-hydroxylase showed that it was decreased in both lines with development and that this activity in T line at two-leaf stage was ca. 50% higher than that in S line. It is suggested that the higher bentazon tolerance in LU21 is primarily associated with an active bentazon metabolism, partially due to a higher bentazon-6-hydroxylase activity coupled with glucosylation.

Keywords

Bentazoncorn, Zea mays (L.). # ZEAMXHydroxylaseinbred lineTaiwanDAT, days after treatmentHPLC, high-performance liquid chromatographyMDA, malondialdehydeS, susceptibleT, tolerantTLC, thin-layer chromatography
Type
Research
Information
Weed Technology , Volume 17 , Issue 3 , September 2003 , pp. 565 - 570
Copyright
Copyright © Weed Science Society of America 

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