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Selectivity Mechanisms of Sethoxydim Absorption into Tissues of Corn (Zea mays) and Pea (Pisum sativum)

Published online by Cambridge University Press:  12 June 2017

Hideo Hosaka  and
Masae (Kubota) Takagi
Hideo Hosaka
Affiliation:
Odawara Res. Ctr., Nippon Soda Co., Ltd., 345 Takada, Odawara, Kanagawa, 250-02, Japan
Masae (Kubota) Takagi
Affiliation:
Odawara Res. Ctr., Nippon Soda Co., Ltd., 345 Takada, Odawara, Kanagawa, 250-02, Japan
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Abstract

The selectivity mechanisms of sethoxydim {2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one} were investigated by examining absorption of 14C-sethoxydim into tissues of corn (Zea mays L. ‘Goldencrossbantam′) and pea (Pisum sativum L. ‘Alaska′). Greater absorption of 14C-sethoxydim was observed only into the proliferative 2-mm terminals of the excised roots of susceptible corn, and the same result was obtained with corn seedlings in hydroponic culture. Absorption was not affected by 1 × 10−4 M 2,4-dinitrophenol (DNP), which indicated that the absorption of 14C-sethoxydim is probably mediated by a passive transport system rather than an active transport system. The selective herbicidal action of sethoxydim appeared to depend largely on the differential rates of absorption into meristematic regions by the susceptible and tolerant plants.

Keywords

Excised rootcoleoptileepicotylleaf disktransportmeristematic tissue
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 35 , Issue 5 , September 1987 , pp. 619 - 622
Copyright
Copyright © 1987 by the Weed Science Society of America 

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References

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