Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2016, Vol. 32 ›› Issue (18): 170-175.doi: 10.11924/j.issn.1000-6850.casb15120093

Special Issue: 油料作物 园艺 农业生态

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Resistance Monitoring of Alopecurus aequalis Sobol. to Quizalofop-P-ethyl and Cross-resistance with Clethodim in Rape Field

Tang Zihui1, Zhou Xiaomao2   

  1. (1Institute of Pesticides, Hunan Agricultural University, Changsha 410128;2Hunan Agricultural Biotechnology Research Center, Changsha 410125)
  • Received:2015-12-15 Revised:2016-06-13 Accepted:2016-02-25 Online:2016-06-28 Published:2016-06-28

Abstract: By detecting the resistance level of Alopecurus aequalis Sobol., and studying its resistance mechanism, a theoretical basis for rational drug use can be provided for A.aequalis resistance management in rape field. The resistance levels of Alopecurus aequalis Sobol. biotypes to quizalofop-P-ethyl and the cross-resistance with clethodim in 17 areas in the middle and lower reaches of Yangtze River were determined using the whole-plant assay method. The glutathione-s-transferase (GSTS) enzyme activity was studied in resistant biotype (R-TY) and susceptible biotype (S-NJ) with quizalofop-P-ethyl and clethodim. The anti-quizalofop monitoring results showed that: TY biotype had the highest relative resistance multiple, which was 28.92, GR50 was 90.183. And then were YZ and BLD biotype, of which, GR50 was 34.480 and 45.472, respectively, and the relative resistance multiple was 11.06 and 14.58, respectively. The relative resistance multiples of other biotypes were ranged from 1.62 to 9.16. The cross-resistance with clethodim showed that there was a cross-resistance between quizalofop and clethodim in TY and BLD biotype, while DYX, the quizalofop sensitive biotype, was resistant to clethodim, indicating A. aequalis biotypes might have other resistance patterns. GSTS activity assay showed that: after drug treatment, the GSTS activity in R-TY biotype was always higher than that in the sensitive biotype S-NJ, indicating that TY biotype’s resistance to drug might be due to the GSTS enhancing effect on drug metabolism.