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- Title
Absorption, translocation and metabolism of bispyribac-sodium on rice seedlings under cold stress.
- Authors
Martini, Luiz Fernando D; Burgos, Nilda R; Noldin, José Alberto; de Avila, Luis Antonio; Salas, Reiofeli A
- Abstract
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 14C-bispyribac-sodium on rice seedlings. RESULTS Maximum 14C-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
- Subjects
CHROMOSOMAL translocation; BISPYRIBAC-sodium; SEEDLING diseases &; pests; RICE diseases &; pests; EFFECT of herbicides on plants; PLANTS
- Publication
Pest Management Science, 2015, Vol 71, Issue 7, p1021
- ISSN
1526-498X
- Publication type
Article
- DOI
10.1002/ps.3882