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首页> 外文期刊>Ciência e Agrotecnologia >Multiple resistance to atrazine and imazethapyr in hairy beggarticks ( Bidens pilosa )
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Multiple resistance to atrazine and imazethapyr in hairy beggarticks ( Bidens pilosa )

机译：毛状乞gg（Bidens pilosa）对阿特拉津和咪唑乙烟的多重抗药性。

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Resistance to herbicides is a serious threat to crop production worldwide, especially in agronomic crops and cereals. This research evaluated the possible occurrence of Bidens pilosa resistant to imazethapyr and atrazine in Brazil. The resistant biotype was collected from an area with a history of repeated application of photosystem II (PSII) and ALS inhibitor herbicides. The susceptible biotype was collected from an area with no history of herbicide application. Resistance verification experiments were carried out in the greenhouse. The treatments were arranged in a 3 x 8 factorial scheme, where the first factor was populations [susceptible (S), parent resistant (PR), and resistant F1 (RF1)]; and the second factor was herbicide dose (0, 375, 750, 1500, 3000, 6000, 12000 and 24000 g ha -1 for atrazine; or 0, 12.5, 25, 50, 100, 200, 400 and 800 g ha -1 for imazethapyr). The resistance factor to atrazine was 2.83 for PR and 5.55 for RF1. This population was more resistant to imazethapyr (>21-fold) than it was to atrazine. The recommended maximum dose of the herbicides did not control this B. pilosa population adequately. The data support the claim that B. pilosa population from this field in Quarto Centen??rio, Parana is resistant to two herbicide modes of action - PSII inhibitor (i.e. atrazine) and ALS inhibitor (i.e. imazethapyr). This is the first report of such case for this species, globally. Cross-resistance to other ALS inhibitors and other PS II inhibitors as well as the respective mechanisms of resistance to each herbicide are being investigated.
机译：对除草剂的抗性对全世界的农作物生产构成严重威胁，特别是在农作物和谷物中。这项研究评估了巴西对咪唑乙烟和阿特拉津具有抗性的Bidens pilosa的可能发生情况。从具有重复应用光系统II（PSII）和ALS抑制剂除草剂历史的地区收集抗性生物型。从没有除草剂应用史的地区收集易感生物型。电阻验证实验是在温室中进行的。治疗安排在3 x 8因子分解方案中，其中第一个因子是种群[易感性（S），亲本抗性（PR）和抗性F1（RF1）];第二个因素是除草剂的剂量（阿特拉津的0、375、750、1500、3000、6000、12000和24000 g ha -1;或0、12.5、25、50、100、200、400和800 g ha -1对于imazethapyr）。 PR对阿特拉津的耐药因子为2.83，RF1对阿特拉津的耐药因子为5.55。与阿特拉津相比，该种群对咪唑乙烟具有更大的抗药性（> 21倍）。所建议的最大除草剂剂量不能充分控制该pilosa种群。数据支持这样的说法，即巴拉那州Quarto Centen ?? rio的这个田间的B. pilosa种群对两种除草剂的作用方式有抗药性-PSII抑制剂（即阿特拉津）和ALS抑制剂（即咪唑乙烟碱）。这是该物种在全球范围内首次出现这种情况。正在研究与其他ALS抑制剂和其他PS II抑制剂的交叉耐药性以及对每种除草剂的耐药性机制。

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