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ABSORPTION AND TRANSLOCATION OF RADIOACTIVE HERBICIDES IN SUBMERSED AND EMERSED AQUATIC WEEDS *
Author(s) -
FUNDERBURK H. H.,
LAWRENCE J. M.
Publication year - 1963
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.1365-3180.1963.tb00250.x
Subject(s) - diquat , simazine , paraquat , shoot , weed , chromosomal translocation , chemistry , botany , absorption (acoustics) , pesticide , environmental chemistry , horticulture , biology , agronomy , atrazine , biochemistry , physics , gene , acoustics
Summary. Absorption and translocation of labelled herbicides by a submersed weed, waterstargrass ( Heteranthera dubia (Jacq.) MacM.) were studied. Autoradiographs showed that simazine (or the labelled carbon atom) and 2,4‐D‐butoxyethyl ester moved both from roots to shoots and from shoots to roots. Ametryne, prometryne, fenac and 2,4‐D (acid) moved to a slight extent from shoot to root, but no movement from root to shoot could be detected in the autoradiographs. However, counting data indicated that small amounts of these four compounds, not recorded on autoradiographs, may move from root to shoot. Radioassay did not detect diquat or paraquat movement to the roots or to the upper portions of the shoots, but the autoradiograph of one plant receiving a root application of paraquat showed slight movement into the lower portion of the stem. Absorption and translocation of labelled herbicides by an emersed weed, alligatorweed ( Alternanthera philoxeroides (Mart.) Griseb.), were also studied. Darkening of film indicated that relative mobility of root‐applied herbicides was as follows: ametryne = fenac = prometryne = simazine>diquat = paraquat> 2,4‐D (acid) = 2,4‐D‐butoxyethyl ester. There was little movement of foliage‐applied simazine, ametryne and prometryne. There was slight downward movement of foliage‐applied fenac, diquat and paraquat, and considerable downward movement of 2,4‐D (acid) and 2,4‐D‐butoxyethyl ester, which accumulated in the nodal regions of the stem. Radiolabelled phosphorus moved in both directions in both plants and there was more movement in an upward direction in both species. Absorption et migration d'herbicides radio‐actifs dans des mauvaises herbes aquatiques immergées et émergentes