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首页> 美国卫生研究院文献>Scientific Reports >Resistance mutations of Pro197 Asp376 and Trp574 in the acetohydroxyacid synthase (AHAS) affect pigments growths and competitiveness of Descurainia sophia L
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Resistance mutations of Pro197 Asp376 and Trp574 in the acetohydroxyacid synthase (AHAS) affect pigments growths and competitiveness of Descurainia sophia L

机译：乙酰羟酸合酶（AHAS）中Pro197Asp376和Trp574的抗药性突变会影响深海地衣藻的色素生长和竞争力

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摘要

D. Sophia is one of the most problematic weed species infesting winter wheat in China, and has evolved high resistance to tribenuron-methyl. Amino acid substitutions at site of Pro197, Asp376 and Trp574 in acetohydroxyacid synthase (AHAS) were mainly responsible for D. sophia resistance to tribenuron-methyl. In this study, D. sophia plant individually homozygous for specific AHAS mutation (Pro197Leu, Pro197His, Pro197Ser, Pro197Thr, Asp376Glu and Trp574Leu) were generated. In addition, the effects of resistance mutations on pigments, growths and competitiveness of susceptible (S) and resistant (R) plants of D. sophia were investigated. The results indicated the R plants carrying Pro197Leu or Pro197His or Asp376Glu or Trp574Leu displayed stronger competitiveness than S plants. The adverse effects on R plants aggravated with the increase of R plants proportion, which made the R plants against domination the weed community in absent of herbicide selection. Therefore, these resistance mutation have no obvious adverse effects on the pigments (chlorophyll a, chlorophyll b and carotenoid), relative growth rates (RGR), leaf area ratio (LAR) and net assimilation rate (NAR) of R plants.
机译：D. Sophia是困扰中国冬小麦的最有问题的杂草之一，并且已发展出对苯磺隆的高抗性。乙酰羟酸合酶（AHAS）中Pro197，Asp376和Trp574位点的氨基酸取代主要负责苏菲菌对苯磺隆的抗性。在这项研究中，产生了针对特定AHAS突变（Pro197Leu，Pro197His，Pro197Ser，Pro197Thr，Asp376Glu和Trp574Leu）分别纯合的D. sophia植物。此外，研究了抗性突变对D. sophia易感性（S）和抗性（R）植物的色素，生长和竞争力的影响。结果表明，携带Pro197Leu或Pro197His或Asp376Glu或Trp574Leu的R植物显示出比S植物更强的竞争力。对R植株的不利影响随着R植株比例的增加而加剧，这使得R植株在没有除草剂选择的情况下抵抗杂草群落。因此，这些抗性突变对R植物的色素（叶绿素a，叶绿素b和类胡萝卜素），相对生长率（RGR），叶面积比（LAR）和净同化率（NAR）没有明显的不利影响。

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