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应用主成分分析方法,综合评价了54个棉花种质铃期(棉红铃虫二代)和吐絮期(棉红铃虫三代)的抗性,结果抗性种质分别有9个(占16.7％)和4个(7.4％),感性种质分别有15个(27.8％)和28个(51.9％),其它属于中间类型。比较种质铃期和吐絮期对棉红铃虫的抗性,铃期抗性表现随棉红铃虫的世代延续,种群数量增大,呈不稳定性。鉴以吐絮期抗性表现是在当年棉红铃虫种群压力最大时的结果,因此认为,抗性鉴定以吐絮期为适。综合指标(又称主成分)能更好地发现和评价种质的抗虫性,但进一步作抗性分级须继续探索。
The principal component analysis method was used to evaluate the resistance of 54 cotton germplasm bolls (second generation of cotton bollworm) and boll opening stage (three generations of cotton bollworm), resulting in 9 resistant germplasms (16.7% %) And 4 (7.4%) respectively, 15 (27.8%) and 28 (51.9%) of the susceptible germplasm, respectively. The resistance to Bollworm’s cotton bollworm (Bollworm’s) was compared at germination boll stage and boll opening stage. The resistance of boll stage was prolonged with the generation of pink bollworm and the population increased. Kam to boll opening period of resistance performance is the result of the population of cotton bollworm when the pressure is the maximum, so that the identification of resistance to boll opening period is appropriate. Comprehensive indicators (also known as the main component) to better identify and evaluate the resistance of germplasm, but further resistance classification should continue to explore.