Identification and expression pattern of a glutathione S-transferase in Echinochloa crus-galli

文献类型： 外文期刊

第一作者： Li, G.

作者： Li, G.;Wu, S. G.;Yu, R. X.;Cang, T.;Chen, L. P.;Zhao, X. P.;Cai, L. M.;Wu, C. X.

作者机构：

关键词： barnyardgrass;expression analysis;GST gene;quinclorac resistance

期刊名称：WEED RESEARCH （ 影响因子：2.424； 五年影响因子：2.533 ）

ISSN： 0043-1737

年卷期： 2013 年 53 卷 5 期

页码：

收录情况： SCI

摘要： Plant glutathione S-transferase (GST) forms a major part of the herbicide detoxification enzyme network in plants. A GST cDNA was isolated from Echinochloa crus-galli and characterised. The gene, designated EcGST1 (E.crus-galli GeneBank no: ), has a 684bp open reading frame predicted to encode a 25kD protein. Sequence alignment showed that EcGST1 is a GST homologue. Its expression in response to quinclorac treatment was monitored in seedlings (leaves and roots) and adult plants (leaves, roots, stems and seeds) of quinclorac-resistant (R) and susceptible (S) biotypes of E.crus-galli. EcGST1 expression was 1.5-3 times greater in the R plants than in the S plants. However, after exposure to quinclorac, the difference in the expression levels of EcGST1 in R plants, compared with S plants, increased to a ratio of 6-10. Enhanced EcGST1 levels should enable greater quinclorac detoxification following quinclorac stimulation in R plants. GST-based metabolism may be partially responsible for resistance to quinclorac in E.crus-galli. The results suggest a new resistance mechanism for this R biotype in Chinese rice fields.

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