陆地棉优质新种质主要经济性状配合力分析

两个陆地棉型优质新种质— 95 42 2系和 95 1 78系同鲁棉 1 4号、中棉所 1 6号和Acala4 42共 5个亲本配成 5× 5 =2 5个杂交组合 ,按Criffing方法 1、模式Ⅰ设计分析了F1 纤维长度、纤维强度、马克隆值、皮棉产量、衣分率、单株铃数、单铃重和籽指共 8个主要经济性状的配合力、遗传力。经分析 ,3个纤维品质性状的遗传主要受加性效应控制。纤维长度的加性效应远比非加性效应的作用重要 ,并估算出较高的广义遗传力 (94 8% )。加性效应为控制马克隆值遗传最主要的成份 ,非加性效应虽占比重小 ,但特殊配合力仍达极显著水平 ,马克隆值的广义遗传力较高 (84 1 5 % )。纤维强度为加性效应所控制 ,非加性效应作用微小。 5个产量性状的广义遗传力中等偏下 ,其中以皮棉产量最高 (6 5 31 % ) ,一般配合力和特殊配合力效应方差均达到极显著水平

COMBINING ABILITY ANALYSIS ON MAIN ECONOMICAL CHARACTER OF FINE FIBRE COTTON IN G. hirsutum L.

Two new fine fibre upland cotton lines 95422 and 95178 were crossed with Lumin 14, Zhongmiansuo 16 and Acala4 42 in a 5×5 diallel design up to 25 crosses. General and special combining abilities, heritabilities of the fibre length, fibre strength, micron, yield of ginned cotton, weight per boll, ginned rate, bolls per plant, weight of 100 seeds were analyzed by the Griffing's Model Ⅰ, Method Ⅰ. The results showed that the three fibre quality characters were controlled mainly by additive effect. The additive effect of the fibre length was more important than its non additive effect. And higher broad heritability(94 8%) of the fibre length was estimated. The most important genetic component of the micron was the additive effect. Special combining ability of the micron was very significant, and its nonadditive effect was in second position. Its broad heritability(84 15%) was high. The additive effect controlled the fibre strength, its non additive effect was lower. Broad heritibilities of the five yield characters were at low of middle. The ginned cotton yield heritibility was the highest among them. Variances of general and special combining abilities of the five yield characters were very significant, indicating the heterosis possibilities.