棉花对棉叶螨抗性的遗传分析

采用F_2分离世代,不完全双列杂交和同核异质系等研究了棉花对叶螨抗性的遗传变异和胞质效应。结果表明,海岛棉对棉叶螨的抗性主要受加性基因效应支配,显性效应不显著;将其抗性转移到陆地棉背景中后鉴定发现,抗螨性广义遗传力为0.44～0.61,受主效基因(暂时定名为S_1)控制。将中棉、草棉、长萼棉、异常棉、哈克尼西棉、海岛棉、墨西哥棉和蓬蓬棉细胞质转移到陆地棉后,对棉叶螨为害没有显著影响。

GENETIC ANALYSIS OF COTTON RESISTANCE TO SPIDER MITE (TETRANYCHUS CINNABARINUS)

The carmine spider mite (CSM. Tetranychus cinnabarinus) is one of the most economically important insect pests on upland cotton in the Southern China. The purpose of this investigation is to test the inheritance of cotton resistance to CSM infestation. The data in the segregating generations of both F_2 and BC, supported that the CSM resistance in Chuan 98. an upland cotton derived from a natural hybridization between Gossypium hirsutum and G. barbadense, was controlled by one gene. Heritabilities in broad sense for the resistance ranged from 0. 44 to 0.61. An incomplete dlallel analysis indicated that the additive effect was significant or highly significant for the CSM resistance whereas the dominance gene effcet was absent. Moreover. there was no significant difference on the CSM infestation between upland cotton cytoplasm and exotic ones.