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Inhibition of Photosynthesis in Downy Brome (Bromus tectorum) and Jointed Goatgrass (Aegilops cylindrica) Protoplasts by Metribuzin and its Ethylthio Analog

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. Agron. and Soils, Washington State Univ., Pullman, WA 99164
David R. Gealy
Affiliation:
USDA, Agric. Res. Serv., 215 Johnson Hall, Washington State Univ., Pullman, WA 99164
Alex G. Ogg Jr.
Affiliation:
USDA, Agric. Res. Serv., 215 Johnson Hall, Washington State Univ., Pullman, WA 99164
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Abstract

Inhibition of net photosynthesis of jointed goatgrass and downy brome protoplasts by metribuzin and its ethylthio analog (ethyl-metribuzin) was greater at 25 than at 10 C. As temperature increased from 10 to 25 C, the concentration of ethyl-metribuzin required to inhibit net photosynthesis 50% (I50) decreased by a factor of 3.5 and 4.3, respectively, in jointed goatgrass and downy brome. I50 values for metribuzin decreased by a factor of 1.5 and 2.5 in jointed goatgrass and downy brome, respectively, for the same 15 C increase in temperature. Based on I50 values at 10 C, metribuzin was nine times more inhibitory than ethyl-metribuzin in jointed goatgrass and eight times more inhibitory in downy brome. At 25 C, metribuzin was only 4.7 and 3.9 times more inhibitory than ethyl-metribuzin in jointed goatgrass and downy brome, respectively. Thus, cold temperatures reduced the activity of ethyl-metribuzin more than metribuzin. The activity of both herbicides was reduced less in protoplasts of jointed goatgrass than in protoplasts of downy brome over the 15 C range.

Keywords

Jointed goatgrass, Aegilops cylindrica Host. # AEGCYdowny brome, Bromus tectorum L. # BROTEmetribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-oneethyl-metribuzin, 4-amino-6-(1,1-dimethylethyl)3-(ethylthio)-1,2,4-triazin-5(4H)-oneTemperatureethyl-metribuzinBAY SMY 1500ethiozinDPX-R7910
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 39 , Issue 1 , March 1991 , pp. 13 - 17
Copyright
Copyright © 1991 by the Weed Science Society of America 

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