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Fate of Picloram in Canada Thistle, Soybean, and Barley

Published online by Cambridge University Press:  12 June 2017

M. P. Sharma  and
W. H. Vanden Born
M. P. Sharma
Affiliation:
Dep. of Plant Sci., Univ. of Alberta, Edmonton, Alberta, Canada
W. H. Vanden Born
Affiliation:
Dep. of Plant Sci., Univ. of Alberta, Edmonton, Alberta, Canada
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Abstract

Autoradiography and radioassay results indicated that 14C-picloram (14C-4-amino-3,5,6-trichloropicolinic acid) was absorbed and translocated rapidly in Canada thistle [Cirsium arvense (L.) Scop.], soybean [Glycine max (L.) Merr. ‘Harosoy 63’], and barley (Hordeum vulgare L. ‘Parkland’) following foliar or root application. Foliar absorption was much faster and more complete in soybean and Canada thistle than in barley. The radioactivity from 14C-picloram accumulated in shoot meristems in Canada thistle and soybean, whereas in barley it was distributed throughout the plant following uptake by foliage or roots. Decarboxylation of 14C-picloram by foliarly-treated Canada thistle, soybean, and barley plants did not occur in appreciable amounts. Chromatographic analysis of ethanol extracts of plants treated with 14C-picloram up to 20 days revealed no evidence of picloram metabolism by these plant species. It is concluded that differences in absorption and in distribution patterns of picloram after shoot or root uptake contribute greatly to the expression of its selective action in the species studied.

Type
Research Article
Information
Weed Science , Volume 21 , Issue 4 , July 1973 , pp. 350 - 353
Copyright
Copyright © 1973 Weed Science Society of America 

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References

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