ISSN:
1365-3180
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Metabolism of 14C-5 (ring)-metribuzin was studied in Steptoe (tolerant) and Morex (susceptible) barley (Hordeum vulgare L.) cultivars, 1, 4, and 8 days following a single application to roots. Both cultivars contained similar ether-soluble metribuzin metabolites and five water-soluble metabolites. Water-soluble compounds increased from 12 to 53% of the total 14C recovered for Steptoe and 5–17% for Morex between 1 day and 8 days, respectively, whereas the percentage of ether-soluble metabolites decreased. Ninhydrin reacting compounds were the major water-soluble metabolites in the leaf blades 8 days after treatment. On a d.p.m. mg−1 dry weight basis, Steptoe leaves had five times more water-soluble material than Morex leaves and half the quantity of ether-soluble compounds. Metribuzin comprised 83 and 89% of the ether-soluble compounds in leaves of Morex and Steptoe, respectively, at 8 days. Terminal radioactivity comprised between 19% and 26% of total radioactivity for both cultivars as early as 1 day after application, with little change over 8 days. Rapid metabolism of metribuzin to non-phytotoxic water-soluble conjugates and terminal residues was the major mechanism responsible for the differential tolerance between these two barley cultivars.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1365-3180.1987.tb00736.x
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