菵草对精噁唑禾草灵的抗性机理研究
首发时间:2015-02-05
摘要:菵草(Beckmannia syzigachne Steud.)是我国小麦田的恶性杂草。精噁唑禾草灵自引入我国一直用于防除麦田杂草。据报道,菵草对精噁唑禾草灵的靶标酶抗性为ACCase上1781位点突变导致。在本研究的三个抗精噁唑禾草灵菵草种群中,发现三个不同的突变,包括JCWL-R种群中的Ile-1781-Leu突变, JCJT-R种群中的 Ile-2041-Asn突变及JYJD-R种群中的Gly-2096-Ala突变。同时,P450抑制剂的使用降低了抗精噁唑禾草灵菵草种群的ED50。本研究中发现了三个抗精噁唑禾草灵菵草的突变位点,且这三个菵草种群的抗性机制包括靶标抗性(TSR)及非靶标抗性(NTSR)。
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Resistance mechnaisms to fenoxaprop-P-ethyl-resistant American sloughgrass (Beckmannia syzigachne Steud.)
Abstract:In this paper,American sloughgrass (Beckmannia syzigachne Steud.) is a competitive grass weed found in China. Fenoxaprop-P-ethyl is an herbicide that has been widely used since first being introduced to China. Target-site-based resistance (TSR) to fenoxaprop-P-ethyl in B. syzigachne is reported to correspond to an isoleucine-1781-leucine substitution in the acetyl-CoA carboxylase (ACCase) gene. The following three mutations were detected in fenoxaprop-P-ethyl-resistant B. syzigachne populations: Ile-1781-Leu in JCWL-R, Ile-2041-Asn in JCJT-R and Gly-2096-Ala in JYJD-R. The use of cytochrome P450 inhibitors slightly reduced the effective dose of 50% inhibition response (ED50) value of fenoxaprop-P-ethyl-resistant populations. Three mutations associated with fenoxaprop-P-ethyl resistance were identified in three B. syzigachne resistant populations that were affected by TSR and non-target-site resistance (NTSR).
Keywords: Beckmannia syzigachne Steud target-site resistance cytochrome P450
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