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Metribuzin Absorption and Translocation in Two Barley (Hordeum vulgare) Cultivars

Published online by Cambridge University Press:  12 June 2017

Stanislaw W. Gawronski ,
Lloyd C. Haderlie  and
Jeffrey C. Stark
Stanislaw W. Gawronski
Affiliation:
Dep. Plant, Soil, and Entomol. Sci., Univ. Idaho, Aberdeen, ID 83210
Lloyd C. Haderlie
Affiliation:
Dep. Plant, Soil, and Entomol. Sci., Univ. Idaho, Aberdeen, ID 83210
Jeffrey C. Stark
Affiliation:
Dep. Plant, Soil, and Entomol. Sci., Univ. Idaho, Aberdeen, ID 83210
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Abstract

Root and foliar absorption and translocation of 14C-metribuzin [4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one] were determined in tolerant (‘Steptoe’) and susceptible (‘Morex’) barley (Hordeum vulgare L.) cultivars grown in nutrient solution culture under greenhouse conditions. Root-applied metribuzin toxicity to the two barley cultivars was also examined. A 50% reduction in growth occurred at 0.22 and 0.72 μM metribuzin for Morex and Steptoe, respectively. Root absorption was similar for both cultivars at 1 day, but Steptoe absorbed about two times more metribuzin 4 and 8 days after application than did Morex. Steptoe absorbed 19% of the total applied metribuzin by 8 days. Root absorption was positively correlated with water uptake (r≥ 0.87). Leaf absorption was three times greater for Morex than for Steptoe after 4 days. Transport to leaves from root application was rapid, and, by 1 and 8 days, leaves of Steptoe contained 71 and 82% and leaves of Morex 78 and 84% of the total absorbed 14C, respectively. Translocation was apoplastic following both root and leaf absorption and was similar for both cultivars. Differential tolerance could partially be accounted for by differences in foliar absorption but not by differences in root absorption.

Keywords

Herbicidecerealherbicide susceptibility
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 34 , Issue 4 , July 1986 , pp. 491 - 495
Copyright
Copyright © 1986 by the Weed Science Society of America 

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References

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