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Absorption, translocation and metabolism of 14 C‐glyphosate in several weed species *
Author(s) -
SANDBERG C. L.,
MEGGITT W. F.,
PENNER DONALD
Publication year - 1980
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.1365-3180.1980.tb00068.x
Subject(s) - convolvulus , cirsium arvense , thistle , glyphosate , biology , weed , botany , polygonum , phloem , agronomy , ecology
Summary: The pattern and extent of 14 C‐glyphosate [N‐(phosphonomethyl)glycine] translocation from the treated leaf and metabolism of 14 C‐glyphosate were studied in field bindweed ( Convolvulus arvensis L.), hedge bindweed ( Convolvulus sepium L.). Canada thistle [ Cirsium arvense (L.) Scop.] tall morning glory [ lpomoea purpurea (L.) Roth.] and wild buckwheat ( Polygonum convolvulus L.). 14 C was translocated throughout the plants within 3 days with accumulation in the meristematic tips of the roots and shoots evident. Cross and longitudinal sections of stems and roots showed that the 14 C was localized in the phloem. Field bindweed translocated 3–5% of the applied 14 C from the treated leaf, hedge bindweed 21.6%, Canada thistle 7.8%, tall morningglory 6.5%, and wild buckwheat 5%. Field bindweed, Canada thistle, and tall morningglory metabolized the parent glyphosate to aminomethylphosphonic acid to a limited extent. This metabolite made up less than 15% of the total 14C. Of the total 14 C applied to excised leaves, 50% had disappeared within 25 days.