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Chinese Journal of Applied Ecology ›› 2020, Vol. 31 ›› Issue (7): 2293-2298.doi: 10.13287/j.1001-9332.202007.038

• Special Features of Plant Allelopathy • Previous Articles     Next Articles

Differences in exogenous methyl jasmonate-induced quinclorac resistance between resistant and sensitive barnyardgrass and the underlying mechanism

CAO Jing-jing1, PENG Qiong2, YANG Xia1, YANG Qian1, BAI Lian-yang2, LI Yong-feng1*, ZHANG Zi-chang1, GU Tao1   

  1. 1Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China;
    2Hunan Provincial Key Laboratory for Biology and Control of Weeds, Changsha 410125, China
  • Received:2019-12-31 Accepted:2020-04-18 Online:2020-07-15 Published:2021-01-15
  • Contact: E-mail: liyongfeng_2010@163.com
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (31801773, 31672042) and the Opening Foundation of Hunan Provincial Key Laboratory for Biology and Control of Weeds (2015TP1016).

Abstract: The effects of exogenous methyl jasmonate (MeJA) on the resistance levels to quinclorac and endogenous hormone levels were examined using the resistant and sensitive biotypes of barnyardgrass with the same genetic background. The results showed that exogenous MeJA could significantly increase the resistance of resistant plants to quinclorac, but did not affect the resistance of sensitive plants. There were significant differences in the contents of indole-3-acetic acid (IAA), abscisic acid (ABA), salicylic acid (SA), and jasmonic acid (JA) among the tested materials. Quinclorac treatment could significantly increase the contents of ABA, SA, and JA in barnyardgrass, with stronger increase of ABA and JA contents in the sensitive plants. Exogenous MeJA could significantly enhance the induction of ABA and JA contents by quinclorac, especially in the sensitive biotypes. These results showed that rapid hormone variations in sensitive plants inhibited their response to herbicide, while gentle hormone variations endowed resistant plants with a strong adapta-bility to herbicide, which closely related to the enhanced resistance by MeJA. ABA and JA hormone signals might play an important role in the resistance of barnyardgrass to quinclorac stress.

Key words: barnyardgrass, quinclorac, herbicide resistance, phytohormone, exogenous MeJA