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首页> 外文期刊>Frontiers in Ecology and Evolution >Study of Fitness Cost in Three Rigid Ryegrass Populations Susceptible and Resistant to Acetyl-CoA Carboxylase Inhibiting Herbicides
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Study of Fitness Cost in Three Rigid Ryegrass Populations Susceptible and Resistant to Acetyl-CoA Carboxylase Inhibiting Herbicides

机译：对三个对乙酰辅酶A羧化酶抑制除草剂敏感的刚性黑麦草种群的健身成本研究

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Evaluation of fitness differences between herbicide-resistant and susceptible weed biotypes, allows a better prediction of further dispersal of herbicide-resistance populations and the design of a management strategy in order to achieve a mitigation of the problem in the absence of herbicide. In this study an evaluation of germination and seedling emergence characteristics of three rigid ryegrass biotypes (one susceptible and two resistant populations with different mutations, namely Ile 1781 Leu and Ile 2041 Asn) and of competition between this weed and wheat using replacement series experiments was conducted. The results showed that when seeds were on the soil surface (0 cm) to depth of 2 cm and again for the depth of 6 cm, there were not any significant differences between the biotypes regarding seed germination percentage. On the contrary, when seeds were sown in 2-4 cm depth, R-1781 consistently displayed lower emergence than the S and R-2041 biotypes. Moreover, when seeds were sown at 8 cm depth, final proportions of emerged seedlings were similar for R-2041 and R-1781, while both populations had significantly higher emergence than the S population. The competitive ability of the three biotypes was similar, as determined by a replacement series experiment with wheat. Our results under competitive conditions revealed that Triticum aestivum was more competitive than Lolium rigidum. Overall, there was no apparent fitness penalty associated to ACCase-inhibitor resistance, while different mutations may impose different competitive ability and therefore require case-specific management strategies.
机译：评估除草剂抗性和易感杂草生物型之间的适应性差异，可以更好地预测除草剂抗性种群的进一步分散，并设计管理策略，以在不使用除草剂的情况下缓解该问题。在这项研究中，使用替代系列实验评估了三种刚性黑麦草生物型（一个易感和两个具有不同突变的抗性种群，即Ile 1781 Leu和Ile 2041 Asn）的发芽和幼苗出苗特性，以及该杂草和小麦之间的竞争。结果表明，当种子在土壤表面（0厘米）至2厘米深度处，再到6厘米深度时，生物型之间在种子发芽率方面没有任何显着差异。相反，当种子播种深度为2-4 cm时，R-1781始终显示出比S和R-2041生物型更低的出苗率。此外，当种子播种深度为8 cm时，R-2041和R-1781的出苗幼苗最终比例相似，而两个种群的出苗率均显着高于S种群。这三种生物型的竞争能力相似，这是通过小麦替代系列实验确定的。我们在竞争条件下的结果表明，普通小麦比刚性黑麦更具竞争性。总体而言，没有明显的适合ACCase抑制剂耐药性的惩罚，而不同的突变可能会带来不同的竞争能力，因此需要针对具体病例的治疗策略。

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