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- Title
Comparison of the uptake, movement and metabolism of fluroxypyr in Stellaria media and Viola arvensis.
- Authors
Sanders, G. E.; Pallett, K. E.
- Abstract
The uptake, movement and metabolism of fluroxypyr is compared in two contrasting weed species, <em>Stellaria media</em> (susceptible) and <em>Viola arvensis</em> (moderately resistant). Similar rates of uptake occurred in both species, with a rapid cuticular uptake of 50% of that applied within 4 h. Total uptake by the underlying leaf tissue reached 66.6% and 70.8% in <em>S. media</em> and <em>V. arvensis</em> after 7 days. In translocation studies, in which 14C-fluroxypyr was applied to previously sprayed plants, 5.1% of applied 14C-activity was translocated from the treated leaves of <em>S. media</em> after 1 day, which increased to 42.2% after 7 days, recovered mainly from the stem tissue. In <em>V. arvensis</em> translocation was similar after 24 h however, after 7 days over 40% of applied 14C-activity remained in the treated leaves and only 9.7% was translocated, mainly to the developing leaves and apical tissue. 14C-activity extracted from the cuticle was the methylheptyl ester of fluroxypyr in both species. In the treated leaves and apical tissue, 14C-activity was the free acid of fluroxypyr and polar conjugates with a significantly greater proportion of the acid in <em>S. media</em>. It is concluded that the resistance of <em>V. arvensis</em> is partially due to reduced translocation and greater conjugation than in the susceptible <em>S. media</em>.
- Subjects
METABOLISM; STELLARIA; CARYOPHYLLACEAE; BACTERIAL conjugation; PLANT translocation
- Publication
Weed Research, 1987, Vol 27, Issue 3, p159
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.1987.tb00749.x