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Glyphosate resistance in common ragweed (Ambrosia artemisiifoliaL.) from Mississippi, USA
Weed Biology and Management ( IF 1.4 ) Pub Date : 2017-03-01 , DOI: 10.1111/wbm.12118
Vijay K. Nandula 1 , Parsa Tehranchian 2 , Jason A. Bond 3 , Jason K. Norsworthy 4 , Thomas W. Eubank 5
Affiliation  

Glyphosate is one of the most commonly used broad-spectrum herbicides over the last 40 years. Due to the widespread adoption of glyphosate-resistant (GR) crop technology, especially corn, cotton and soybean, several weed species have evolved resistance to this herbicide. Research was conducted to confirm and characterize the magnitude and mechanism of glyphosate resistance in two GR common ragweed ( A mbrosia artemisiifolia L.) biotypes from Mississippi, USA. A glyphosate-susceptible (GS) biotype was included for comparison. The effective glyphosate dose to reduce the growth of the treated plants by 50% for the GR1, GR2 and GS biotypes was 0.58, 0.46 and 0.11 kg ae ha−1, respectively, indicating that the level of resistance was five and fourfold that of the GS biotype for GR1 and GR2, respectively. Studies using 14 C-glyphosate have not indicated any difference in its absorption between the biotypes, but the GR1 and GR2 biotypes translocated more 14 C-glyphosate, compared to the GS biotype. This difference in translocation within resistant biotypes is unique. There was no amino acid substitution at codon 106 that was detected by the 5-enolpyruvylshikimate-3-phosphate synthase gene sequence analysis of the resistant and susceptible biotypes. Therefore, the mechanism of resistance to glyphosate in common ragweed biotypes from Mississippi is not related to a target site mutation or reduced absorption and/or translocation of glyphosate.

中文翻译:

来自美国密西西比州的普通豚草 (Ambrosia artemisiifoliaL.) 的草甘膦抗性

草甘膦是过去 40 年来最常用的广谱除草剂之一。由于抗草甘膦 (GR) 作物技术的广泛采用,特别是玉米、棉花和大豆,几种杂草已经进化出对这种除草剂的抗性。进行了研究以确认和表征来自美国密西西比州的两种 GR 普通豚草 (A mbrosia artemisiifolia L.) 生物型中草甘膦抗性的程度和机制。包括草甘膦敏感 (GS) 生物型以进行比较。对于 GR1、GR2 和 GS 生物型,使处理植物生长减少 50% 的有效草甘膦剂量分别为 0.58、0.46 和 0.11 kg ae ha-1,表明抗性水平是抗性水平的 5 和 4 倍。分别为 GR1 和 GR2 的 GS 生物型。使用 14 C-草甘膦的研究未表明生物型之间的吸收存在任何差异,但与 GS 生物型相比,GR1 和 GR2 生物型转移了更多的 14 C-草甘膦。这种抗性生物型内易位的差异是独一无二的。通过对抗性和易感生物型的 5-enolpyruvylshikimate-3-磷酸合酶基因序列分析检测到密码子 106 处没有氨基酸取代。因此,密西西比州常见豚草生物型对草甘膦的抗性机制与目标位点突变或草甘膦吸收减少和/或易位无关。这种抗性生物型内易位的差异是独一无二的。通过对抗性和易感生物型的 5-enolpyruvylshikimate-3-磷酸合酶基因序列分析检测到密码子 106 处没有氨基酸取代。因此,密西西比州常见豚草生物型对草甘膦的抗性机制与目标位点突变或草甘膦吸收减少和/或易位无关。这种抗性生物型内易位的差异是独一无二的。通过对抗性和易感生物型的 5-enolpyruvylshikimate-3-磷酸合酶基因序列分析检测到密码子 106 处没有氨基酸取代。因此,密西西比州常见豚草生物型对草甘膦的抗性机制与目标位点突变或草甘膦吸收减少和/或易位无关。
更新日期:2017-03-01
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