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Aufnahme und Metabolismus von Hexazinon in Rubus hispidus L. und Pyrus melanocarpa (Michx.) Willd
Author(s) -
JENSEN K. I. N.,
KIMBALL E. R.
Publication year - 1990
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.1365-3180.1990.tb01685.x
Subject(s) - rubus , botany , metabolite , hexazinone , biology , metabolism , chemistry , horticulture , agronomy , biochemistry , weed control
Summary: Rooted cuttings of Pyrus melanocarpa (Michx.) Willd. had a 3.5‐fold greater tolerance to soil‐applied hexazinone than those of Rubus hispidus L. in a greenhouse trial. R. hispidus accumulated four times more 14 C‐label in the foliage following root uptake of 14 C‐hexazinone than P. melano‐carpa . Here, the greater uptake and susceptibility of R. hispidus was related to its greater root:fol‐iage (weight) ratio compared to the tolerant P. melanocarpa . However, in whole plant metabolism studies employing younger plants there were no differences in 14 C accumulation in the leaves. Here 14 Chexazinone was converted to a number of hydroxylated and/or demethylated triazinone metabolites in both species following vacuum infiltration into leaf disks and root sections, or following root uptake in whole plants. A major difference in metabolism between the two species was the greater formation of the mono demethylated metabolite, B, [3‐cyclohexyl‐6‐methylamino‐l‐methyl‐l,3,5‐triazine‐2,4‐dione] in P. melanocarpa which may also contribute to its greater tolerance. A loss of total 14 Clabel from all plant parts with time may reflect cleavage of the 14 C‐ring‐labelled herbicide.