定义Raphanus raphanistrumAHAS抗性水平的等位相互作用:强与弱的目标位点AHAS抗性等位基因
Mercedes Gil1, Federico Garcia2,3, Gabriela Breccia1
1IICAR, UNR, CONICET, Facultad de Ciencias Agrarias, Universidad Nacional de Rosario, Santa Fe, Argentina.
Pest management science
|October 16, 2024
概括
阿拉-122-Tyr突变赋予拉法努斯拉法尼斯特姆比Asp-376-Glu突变更强的硫耐药性. 这一发现加深了我们对酸酸合成酶 (AHAS) 点抗性的理解.
科学领域:
- 植物遗传学 植物遗传学
- 除草剂耐药性机制的机制
- 分子生物学分子生物学
背景情况:
- 在Raphanus raphanistrum中研究了硫耐药性和遗传优势.
- 在AHAS基因中使用了具有位抗性突变 (Ala-122-Tyr,Asp-376-Glu) 的基因型.
研究的目的:
- 为了评估Raphanus raphanistrum的硫耐药性和遗传优势.
- 为了比较不同AHAS目标位点耐药性突变的疗效.
主要方法:
- 评估了乙酸酸合成酶 (AHAS) 酶活性和I50值.
- 在不同度的硫下,确定整个植物的生存率和中位数致命剂量 (LD50).
- 使用GR50值评估的地面生长减少.
主要成果:
- 与Asp-376-Glu等位基相比,Ala-122-Tyr等位基赋予了显著更高的抗性 (更高的I50,LD50和GR50值).
- 具有122-Tyr等位基因的同卵性和异卵性基因型显示出更高的存活率和减少的生长抑制.
- 122-Tyr等位基因对376-Glu等位基因表现出优势.
结论:
- 与376-Glu等位基因相比,Ala-122-Tyr突变代表了R. raphanistrum中更强的目标位抗性等位基因.
- 结果增强了对杂草中AHAS目标站点耐药性演变的理解.
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