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Effect of Temperature on Root Absorption of Metribuzin and its Ethylthio Analog by Winter Wheat (Triticum aestivum), Jointed Goatgrass (Aegilops cylindrica), and Downy Brome (Bromus tectorum)

Published online by Cambridge University Press:  12 June 2017

Robert A. Buman ,
David R. Gealy  and
Alex G. Ogg Jr.
Robert A. Buman
Affiliation:
Dep. Crop and Soil Sciences, Washington State Univ. Pullman, WA 99164
David R. Gealy
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., 215 Johnson Hall, Washington State Univ., Pullman, WA 99164
Alex G. Ogg Jr.
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., 215 Johnson Hall, Washington State Univ., Pullman, WA 99164
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Abstract

Root absorption of subtoxic levels of metribuzin and its ethylthio analog (ethyl-metribuzin) by downy brome, jointed goatgrass, and winter wheat increased by a factor of three to five times as temperature increased from 10 to 20 C. Absorption of ethyl-metribuzin per gram dry weight was similar for all three species. Absorption and distribution of ethyl-metribuzin, but not metribuzin, were similar per gram dry weight in downy brome and jointed goatgrass. Absorption of metribuzin per gram dry weight was lower for winter wheat than for the other two species at 20 C. In general, the ratio of absorbed ethyl-metribuzin detected in shoots to that in roots was less in winter wheat and jointed goatgrass than in downy brome. The absorption by roots of 14C-herbicides relative to water was similar for winter wheat and jointed goatgrass. Absorption of both 14C-herbicides by winter wheat and jointed goatgrass was nonpreferential with respect to water absorption at 10 and 15 C. However, at 20 C 14C-herbicide absorption was reduced 5 to 30% with respect to water absorption. Downy brome absorption of 14C-herbicides with respect to water was 30 to 50% less than that of the other two species.

Keywords

Ethyl-metribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(ethylthio)-1,2,4-triazin-5(4H)-onemetribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-onewinter wheat, Triticum aestivum L. ‘Daws’jointed goatgrass, Aegilops cylindrica Host #3 AEGCYdowny brome, Bromus tectorum L. # BROTEEthyl-metribuzinSMY 1500ethiozinAEGCYBROTE
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 40 , Issue 4 , December 1992 , pp. 517 - 521
Copyright
Copyright © 1992 by the Weed Science Society of America 

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References

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