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对我国自育的108个陆地棉品种的抗黄萎病性进行了研究。在黄萎病发病期内,对黄萎病发病情况进行连续调查,测定产量、考查产量因素并检测纤维品质。利用因子分析法对陆地棉抗黄萎病反应规律进行分析,得出不同时期的黄萎病病指主要与前后3～5个阶段抗病性有关。病情发展主要由4个主因子决定,且第1、2主因子具有较大的方差贡献率。第1主因子(F1)主要与品种7月26日至8月9日的黄萎病病指有关,第2主因子(F2)主要与品种8月20日至9月4日的黄萎病病指有关。利用因子分析结果将108个品种划分为4个类型,前期抗病性较好而后期发病较快的第Ⅰ类品种,其产量较低,单株结铃数、单铃重、衣分均低于其他3类;纤维品质均较差,纤维长度、整齐度、比强度和马克隆值均较其他3类差。前期和后期病指均较低、发病缓慢的第Ⅱ类则小区产量最高,纤维品质处于平均水平。第Ⅲ类品种前期发病较慢,中期发病较快,具有较高的小区产量,单铃重最高;纤维整齐度、比强度和伸长率好于其他3类品种;前期发病较快,中期发病平缓,后期仍具有较高病指的为第Ⅳ类品种,小区产量较低,单株产量、单株结铃数和衣分较高;其他性状处于中等水平。但研究表明,某一阶段具有的抗病性并不能完全代表品种的抗病性。
The resistance to Verticillium wilt in 108 Upland cotton cultivars in China was studied. During the period of Verticillium wilt, the incidence of Verticillium wilt was continuously investigated, the yield was measured, the yield factors were examined, and the fiber quality was tested. The factor analysis method was used to analyze the reaction rules of Wilt of Upland Cotton (Upland Cotton). The results showed that the disease index of Verticillium Wilt at different periods was mainly related to the disease resistance in 3 ~ 5 stages. The development of the disease is mainly determined by four main factors, and the first and second main factors have a larger contribution to the variance. The first major factor (F1) was mainly related to Verticillium wilt disease from July 26 to August 9, and the second factor (F2) was mainly related to Verticillium wilt (Verticillium dahliae) from August 20 to September 4 Disease refers to. According to the result of factor analysis, 108 cultivars were divided into 4 types, and the first type of cultivars with good disease resistance in the early stage and fast onset in the later stage had lower yield, bolls per plant, single boll weight, In the other three categories, fiber quality was poor, fiber length, uniformity, specific strength and micronaire were worse than the other three categories. The pre-and post-disease index were lower, the slow onset of the second category is the highest yield cell, fiber quality at an average level. The disease of type Ⅲ was earlier onset, the disease of middle period was faster, the yield of community was higher, the boll weight was the highest, the fiber uniformity, specific strength and elongation were better than the other three varieties. The incidence of early stage was moderate and the incidence was moderate , The latter still has a higher disease index for the fourth species, the plot yield is low, yield per plant, the number of bolls per plant and the higher lint percentage; other traits at the intermediate level. However, studies have shown that the resistance of a certain stage does not completely represent the disease resistance of the breed.