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Effect of Temperature on Picloram Absorption and Translocation in Leafy Spurge (Euphorbia esula)

Published online by Cambridge University Press:  12 June 2017

Rodney G. Lym  and
Calvin G. Messersmith
Rodney G. Lym
Affiliation:
Crop and Weed Sci. Dep., N.D. State Univ., Fargo, ND 58105
Calvin G. Messersmith
Affiliation:
Crop and Weed Sci. Dep., N.D. State Univ., Fargo, ND 58105
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Abstract

Temperature changes prior to picloram application affects its activity in leafy spurge. Absorption of 14C picloram was directly correlated with temperature changes; each 1 C increase in air temperature 24 h before treatment resulted in a 1% increase of 14C-picloram absorption in leafy spurge and vice versa. The greatest 14C-picloram absorption averaged 47% of applied 14C when the temperature increased from 18 C to 24 or 30 C 24 h before treatment compared to 33% when temperatures were constant. Translocation of 14C picloram was more sensitive than absorption to temperature changes with 4.3 and 1% of applied 14C-picloram translocated to the roots when the plants were maintained at 12 and 30 C, respectively. Even though absorption increased directly with temperature, 14C-picloram translocation to the root system declined as temperature increased.

Keywords

Picloram, 4-amino-3,5,6-trichloro-2-pyridinecarboxylic acidleafy spurge, Euphorbia esula L. # EPHESEnvironmentpasture and rangeland weed controlEPHES
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 38 , Issue 6 , November 1990 , pp. 471 - 474
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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