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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Fitness costs and benefits of novel herbicide tolerance in a noxious weed
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Fitness costs and benefits of novel herbicide tolerance in a noxious weed

机译：有害杂草中新型除草剂耐受性的健身成本和收益

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Glyphosate, the active ingredient in the herbicide RoundUp, has increased dramatically in use over the past decade and constitutes a potent anthropogenic source of selection. In the southeastern United States, weedy morning glories have begun to develop tolerance to glyphosate, representing a unique opportunity to examine the evolutionary genetics of a novel trait. We found genetic variation for tolerance, indicating the potential for the population to respond to selection by glyphosate. However, the following significant evolutionary constraint exists: in the absence of glyphosate, tolerant genotypes produced fewer seeds than susceptible genotypes. The combination of strong positive directional selection in the presence of glyphosate and strong negative directional selection in its absence may indicate that the selective landscape of land use could drive the evolutionary trajectory of glyphosate tolerance. Understanding these evolutionary forces is imperative for devising comprehensive management strategies to help slow the rate of the evolution of tolerance.
机译：草甘膦是除草剂RoundUp中的活性成分，在过去十年中使用量急剧增加，构成了有效的人为选择来源。在美国东南部，杂草牵牛花已经开始对草甘膦产生耐受性，这代表了一个独特的机会来研究一种新特性的进化遗传学。我们发现了耐受性的遗传变异，表明该人群对草甘膦的选择产生响应的潜力。但是，存在以下重要的进化限制：在没有草甘膦的情况下，耐性基因型产生的种子少于易感基因型。在草甘膦存在下强的正向选择与在草甘膦不存在下的强负向选择相结合，可能表明土地利用的选择性态势可以驱动草甘膦耐受性的演变轨迹。了解这些进化力量对于设计综合管理策略以帮助减缓耐受性进化的速度至关重要。

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