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Translocation of 14C-Glyphosate and 14CO2-Labeled Photoassimilates in Canada Thistle (Cirsium arvense)

Published online by Cambridge University Press:  12 June 2017

Ray S. McAllister  and
Lloyd C. Haderlie
Ray S. McAllister
Affiliation:
Dep. Plant Path., Seed and Weed Sci., Iowa State Univ., Ames, IA 50011 Dep. Agron., Univ. of Nebraska, Lincoln, NE 68583
Lloyd C. Haderlie
Affiliation:
Aberdeen Res. and Ext. Center, Univ. of Idaho, Aberdeen, ID 83210 Dep. Agron., Univ. of Nebraska, Lincoln, NE 68583
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Abstract

Translocation of 14CO2-labeled photoassimilates was compared to movement of 14C-glyphosate [N-(phosphonomethyl)glycine] in Canada thistle [Cirsium arvense (L.) Scop. ♯ CIRAR] under field and controlled-environment conditions. Field-grown Canada thistle plants were treated on mature upper leaves at the midflower stage in mid-June and harvested 8 days later. No differences were found in glyphosate and assimilate distribution, and movement was primarily basipetal. Of the glyphosate and photoassimilates translocated from the treated leaves, 25 and 31%, respectively, were recovered from the roots, while 59 and 58%, respectively, were found in the shoot tissue below the treated leaf. Concentration of labeled glyphosate in the roots as much as 95 cm from the treated shoot was as high as at the base of the treated shoot. Photoperiods that induce flowering (15 h) or maintain vegetative growth (13 h) did not differentially affect the distribution of photoassimilates or glyphosate in 7-week-old Canada thistle plants in the growth chamber. In growth chamber-grown plants equivalent amounts of glyphosate and assimilates were translocated out of treated leaves; however, relatively more glyphosate than photoassimilates accumulated in the roots.

Keywords

Perennial weedsmultivariate analysisphotoperiodCIRAR
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 33 , Issue 2 , March 1985 , pp. 153 - 159
Copyright
Copyright © 1985 by the Weed Science Society of America 

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References

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