PDF(Pubmed)
Abstract：
A putative glufosinate-resistant Amaranthus palmeri population was reported in 2015 in Anson County, North Carolina. The results from dose-response assays conducted in the field suggested plants were surviving lethal rates of glufosinate. Dose-response assays conducted in the glasshouse determined the Anson County accession exhibited reduced susceptibility to glufosinate compared to three glufosinate-susceptible populations. The LD50 values (210-316 g ai ha-1) for the Anson County population were always higher than the LD50 values (118-158 g ai ha-1) for the tested susceptible populations from the dose-response assays. Anson County plants that survived lethal glufosinate rates were reciprocally crossed with susceptible plants to create F1 genotypes and treated with a lethal rate of glufosinate (267 g ai ha-1; ascertained from glasshouse dose-response assay) to determine the distribution of injury and survival for each cross compared to a cross of susceptible parents. The distribution of injury was non-normal for the crosses containing an Anson County plant compared to the cross with a susceptible parent. Survival was 68%-84% for crosses containing an Anson County plant, whereas the survival was significantly reduced to 35% for the susceptible plant cross. Chi-square goodness of fit tests were used to test inheritance models to describe the responses of the genotypes. The resistant × susceptible crosses were best described with a heterozygous two loci with incomplete dominance model compared to the resistant × resistant cross that was best described with a heterozygous single locus with incomplete dominance model. The Anson County population has evolved resistance to glufosinate that is heritable and likely conferred by an oligogenic mechanism with incomplete dominance.
摘要：
2015年，安森县报告了推定的耐草铵膦的Amaranthuspalmeri种群，北卡罗来纳州。在田间进行的剂量反应测定的结果表明，植物存活的草铵膦致死率。在温室中进行的剂量反应测定确定，与三个草铵膦易感人群相比，安森县的登录名对草铵膦的易感性降低。安森县人群的LD50值（210-316gaiha-1）始终高于剂量反应测定中测试的易感人群的LD50值（118-158gaiha-1）。将存活致死草铵膦率的安森县植物与易感植物相互杂交，以创建F1基因型，并用草铵膦的致死率（267gaiha-1；从温室剂量反应测定中确定）进行处理，以确定与易感亲本的杂交相比，每个杂交的损伤和存活分布。与易感亲本的杂交相比，包含安森县植物的杂交的伤害分布不正常。包含安森县植物的杂交存活率为68％-84％，而易感植物杂交的存活率显着降低至35％。卡方拟合优度检验用于测试遗传模型以描述基因型的反应。与具有不完全显性模型的杂合单个基因座最好描述的抗性×抗性杂交相比，抗性×易感杂交用具有不完全显性模型的杂合两个基因座最好描述。安森县的人口已经对草铵膦产生了抗性，这种抗性是可遗传的，并且可能是由具有不完全优势的寡基因机制赋予的。
