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Exploring quinclorac resistance mechanisms inEchinochloa crus-pavonisfrom China

文献类型： 外文期刊

作者： Yang, Xia 1 ; Han, Heping 2 ; Cao, Jingjing 1 ; Li, Yongfeng 1 ; Yu, Qin 2 ; Powles, Stephen B. 2 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Plant Protect, Nanjing, Peoples R China

2.Univ Western Australia, Sch Agr & Environm, Australian Herbicide Resistance Initiat, Crawley, Australia

3.Jiangsu Univ, Agr Engn Res Inst, Zhenjiang, Jiangsu, Peoples R China

关键词： Echinochloa crus-pavonis; quinclorac resistance; quinclorac metabolism; quinclorac translocation

期刊名称：PEST MANAGEMENT SCIENCE （ 影响因子：4.845； 五年影响因子：4.674 ）

ISSN： 1526-498X

年卷期：

页码：

收录情况： SCI

摘要： BACKGROUND Barnyardgrass (Echinochloaspp.) is a global weed in rice fields. Quinclorac is commonly used to control barnyardgrass. However, due to persistent use, quinclorac resistance has evolved. We obtained quinclorac-susceptible (QS) and -resistant (QR1, QR2) lines from the progeny of a single resistantE. crus-pavonisfor a resistance mechanism study. RESULTS Line QR1 exhibited resistance to high quinclorac rates (up to 6400 g ha(-1)), whereas line QR2 exhibited a resistance/susceptibility segregation ratio of 3:1 at the field or lower rates (400, 100 g ha(-1)). Intriguingly, a lower level of(14)C-quinclorac metabolism and hence a higher level of(14)C-quinclorac translocation was observed in QR1 than QS plants. The basal expression levels of 1-aminocyclopropane-1-carboxylic acid (ACC) synthase (ACS) and ACC oxidase 2 (ACO2) genes did not differ significantly between the QR1 and QS lines. However, more expression ofACSandACOgenes was induced by quinclorac treatment in QS than in QR1. Basal levels of beta-cyanoalanine synthase (beta-CAS) gene expression were similar in QS and QR1 plants, but a greater level of down-regulation was detected in QS than in QR1 plants after quinclorac treatment. CONCLUSION These results indicate QR plants are less responsive to quinclorac than QS plants in terms of up-regulating quinclorac metabolism and ethylene synthesis. Resistance in thisE. crus-pavonisline is likely controlled by a single major gene, involving possibly an alteration in auxin signal perception/transduction to the ethylene biosynthesis pathway. The beta-CAS is unlikely to play a major role in quinclorac resistance in this particular population.

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