Interpopulation variability and adaptive potential for reduced glyphosate sensitivity in Alopecurus myosuroides.
Interpopulation variability and adaptive potential for reduced glyphosate sensitivity in Alopecurus myosuroides.
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DOI：
10.1111/wre.12264
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发表时间：
2017-10
期刊：
影响因子：
1.7
通讯作者：
Neve P
中科院分区：
文献类型：
--
作者：
Davies LR;Neve P
在过去的20年里，英国的草甘膦使用量增加了一倍多。这一增长的大部分是由于在作物钻探之前努力控制抗除草剂杂草，特别是大穗看麦娘。在类似情况下，草甘膦抗性的演变有先例，这引起了人们对英国草甘膦使用可持续性的担忧。我们使用剂量反应实验来研究40个野外收集的大尾菊种群之间草甘膦敏感性的变化。没有种群对草甘膦产生抗性，但艾德90值在354和610 g a.i. ha−1之间。五个群体的艾德90值显着高于未暴露的控制人口从一个网站在Rothamsted研究，没有以前的草甘膦暴露。进行轮回选择实验以确定草甘膦敏感性的变化是否具有遗传基础。经过两轮选择后，六个田间种群中有五个种群对草甘膦的敏感性显著降低，根据估计的艾德50值，R/S比值在1.2至1.5之间。这些结果证实了草甘膦敏感性的变异存在遗传基础。对选择的反应是温和的。进化的种群对草甘膦的抗性并不高，尽管一些经过两次选择的个体在推荐的田间率下存活下来。这些结果并不代表大穗菊可能进化出草甘膦抗性的确切证据，尽管它们确实表明，在考虑增加草甘膦使用以控制这种除草剂抗性倾向物种的可持续性时，需要谨慎。
Glyphosate use in the United Kingdom has more than doubled in the last 20 years. Much of this increase is driven by efforts to control herbicide resistant weeds, particularly Alopecurus myosuroides, prior to crop drilling. There is precedent for evolution of glyphosate resistance in similar situations, raising concerns over the sustainability of glyphosate use in the UK. We used dose–response experiments to examine variation in glyphosate sensitivity amongst 40 field‐collected A. myosuroides populations. No populations were resistant to glyphosate, but ED 90 values ranged between 354 and 610 g a.i. ha−1. Five populations had ED 90 values significantly higher than the unexposed control population collected from a site at Rothamsted Research with no previous glyphosate exposure. Recurrent selection experiments were performed to determine whether variation in glyphosate sensitivity had a heritable basis. Following two rounds of selection, five of six field populations evolved significantly reduced sensitivity to glyphosate, with R/S ratios, based on estimated ED 50 values, ranging from 1.2 to 1.5. These results confirm that there is a heritable basis to variation in glyphosate sensitivity. The response to selection was modest. Evolved populations were not highly resistant to glyphosate, although some twice‐selected individuals survived recommended field rates. These results do not represent definitive proof of the potential of A. myosuroides to evolve glyphosate resistance, although they do indicate caution is needed when considering the sustainability of increased glyphosate use to control this herbicide resistance‐prone species.
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影响因子：
4.3
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