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Absorption, translocation and metabolism of bispyribac‐sodium on rice seedlings under cold stress
Author(s) -
Martini Luiz Fernando D,
Burgos Nilda R,
Noldin José Alberto,
de Avila Luis Antonio,
Salas Reiofeli A
Publication year - 2015
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.3882
Subject(s) - chromosomal translocation , metabolism , absorption (acoustics) , sodium , agronomy , piperonyl butoxide , chemistry , weed , weed control , biology , pesticide , biochemistry , materials science , organic chemistry , composite material , gene
BACKGROUND Rice production is highly affected by weed competition. The efficacy of chemical weed control and crop safety is a function of absorption, translocation and metabolism of herbicides. This study investigates the effect of cold stress 22/16 °C (day/night) on absorption, translocation and metabolism of 14 C ‐bispyribac‐sodium on rice seedlings. RESULTS Maximum 14 C ‐bispyribac‐sodium absorption occurred at 24 h after herbicide treatment and was stimulated by the warm 30/22 °C (day/night) temperature. A large amount of total absorbed herbicide was retained in the treated leaf, indicating that bispyribac‐sodium had minimal translocation to other plant parts. Piperonyl‐butoxide (a P450 inhibitor) plus herbicide caused greater injury than the herbicide alone. In addition, injury on rice plants was enhanced by exposure to cold, emphasizing the negative effect on herbicide metabolism. In the thin‐layer chromatography metabolism experiment, cold‐grown plants had higher injury and retained more of the parent herbicide than plants grown at a warm temperature. CONCLUSION Cold stress reduces bispyribac‐sodium absorption and metabolism in rice, but has no effect on translocation. © 2014 Society of Chemical Industry