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Selectivity factors relative to asulam for Senecio jacobaea L. control in Medicago sativa L. II. Metabolism *
Author(s) -
HARPER DELBERT R.,
APPLEBY ARNOLD P.
Publication year - 1984
Publication title -
weed research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 74
eISSN - 1365-3180
pISSN - 0043-1737
DOI - 10.1111/j.1365-3180.1984.tb00575.x
Subject(s) - senecio , medicago sativa , chemistry , acetone , aqueous two phase system , botany , horticulture , aqueous solution , biology , biochemistry , organic chemistry
Summary Metabolism of 14 C asulam applied with surfactant was studied in Senecio Jacobaea L. and Medicago saliva L. Plants were harvested 48, 96 and 144 h after treatment and extracted with acetone. The aqueous residue of the acetone extract was partitioned with ethyl acetate and the 14 C activity in the ethyl‐acetate phase, the aqueous phase and the plant residue was determined. A significant amount of 14 C activity was not extracted by acetone from either species. This amount increased with time in M. sativa but remained relatively constant in S. jacobaea. More 14 C activity was found in the aqueous phase than in the ethyl‐acetate phase in M. sativa while the reverse was true in S. jacobaea. Significantly lower amounts of free asulam were identified in M. sativa than in S. jacnbaea. Still, results of these and previous studies on retention, uptake and translocation do not completely account for differences in sensitivity found in greenhouse and field applications. Other possible explanations for selectivity are discussed.