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Spray retention, foliar uptake and translocation of glufosinate and glyphosate in Ambrosia artemisiifolia
Author(s) -
GRANGEOT M,
CHAUVEL B,
GAUVRIT C
Publication year - 2006
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.1365-3180.2006.00495.x
Subject(s) - glufosinate , glyphosate , ambrosia artemisiifolia , abutilon , wax , chromosomal translocation , trichome , weed , botany , baccharis , chemistry , biology , horticulture , agronomy , ragweed , asteraceae , biochemistry , allergy , gene , immunology
Summary Ambrosia artemisiifolia plants exhibit stomata on both leaf surfaces and three types of trichomes: (i) small (<50 μ m) spherical or ovoid, (ii) medium‐sized (50–100 μ m) and (iii) long (100–200 μ m) and sharp. Only the long and sharp trichomes were stained with AgNO 3 , indicating the presence of hydrophilic domains. Epicuticular waxes appeared amorphous, consistent with high levels of spray retention. Glufosinate was readily taken up by A. artemisiifolia leaves, with maximum uptake of >80% of the applied label, and half maximum uptake being reached within 6 h. The foliar uptake of glyphosate was nearly complete and half of it was attained after 3 h. Glufosinate and glyphosate were ambimobile and their translocation out of the treated leaves amounted to 13–16% and 11–15% of the absorbed radioactive label respectively. Glufosinate was mainly directed to the apical developing tissues, with less amounts reaching the tissues below the treated leaves. Glyphosate was directed towards the sink tissues (apical developing tissues and roots). The sensitivity of A. artemisiifolia to glufosinate and glyphosate can be explained by high spray retention, rapid and important foliar uptake, and appreciable migration out of the parts of the plant hit by the spray.