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| Carvalho,S.J.P.; Soares,D.J.; Lopez-Ovejero,R.F.; Christoffoleti,P.J.. |
| Two experiments were carried out to evaluate soil persistence of chlorimuron-ethyl and metsulfuron-methyl and phytotoxicity to corn seeded as a succeeding crop. One experiment was conducted with chlorimuron-ethyl applied at 20 g ha-1, and one with metsulfuron-methyl applied at 3.96 g ha-1. Treatments were arranged in a factorial design with two types of soil (sandy and clay), three irrigation regimes (daily, weekly and no irrigation) and four application timings (90, 60 and 30 days before corn seeding, as well as untreated plots). Soil persistence of the herbicides was influenced by water availability, molecule water solubility (leaching potential) and application timings prior to corn seeding. In sandy soil, with adequate water availability, leaching... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carryover; Leaching; Microbial degradation; Dynamics. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000200331 |
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| Hongming,Liu; Xu,Lou; Zhaojian,Ge; Fan,Yang; Dingbin,Chen; Jianchun,Zhu; Jianhong,Xu; Shunpeng,Li; Qing,Hong. |
| The strain JPL-2, capable of degrading fenoxaprop-P-ethyl (FE), was isolated from the soil of a wheat field and identified as Rhodococcus ruber. This strain could utilize FE as its sole carbon source and degrade 94.6% of 100 mg L−1 FE in 54 h. Strain JPL-2 could also degrade other aryloxyphenoxy propanoate (AOPP) herbicides. The initial step of the degradation pathway is to hydrolyze the carboxylic acid ester bond. A novel esterase gene feh, encoding the FE-hydrolyzing carboxylesterase (FeH) responsible for this initial step, was cloned from strain JPL-2. Its molecular mass was approximately 39 kDa, and the catalytic efficiency of FeH followed the order of FE > quizalofop-P-ethyl > clodinafop-propargyl > cyhalofop-butyl > fluazifop-P-butyl >... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fenoxaprop-P-ethyl; Microbial degradation; Rhodococcus ruber JPL-2; FE -hydrolyzing carboxylesterase gene. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000200425 |
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