陆地棉不同铃期和铃位籽棉产量杂种优势的遗传研究

关于陆地棉品种间 F1产量杂种优势的表现及其遗传机理 ,自 50年代以来 ,国内外曾作了大量的研究 ,但尚未见从生育动态和空间构成方面研究产量杂种优势的报道。本文从时空角度研究产量杂种优势 ,以深入了解杂种优势在时间上和空间上的特点 ,指导生产和选配优良组合。1　材料与方法1 .1　试验材料本试验选用 4个栽培品种 (泗棉 3号、徐州 1 84、浙 9和中 1 3 ) ,5个美国引进材料 (51 8151 8 3、52 3 2、51 0 2和 51 0 5)和 3个自选系 (52 54、52 4 2和 52 58)及配制成的 1 7个杂交组合。1 .2　试验方法1 .2 .1　试验设计　田间试验于 1 995年…

Genetic Study on Seed Cotton Yield at Different Boll-setting Stages and Fruiting Sites in Upland Cotton

Twelve parents and their 17 F 1 hybrids of Upland cotton were analyzed by an additive dominance genetic model with genotype by environment interaction and corresponding statistical approaches for seed cotton yield at different blooming stages and fruiting sites in two years. The results showed that the heterosis of final seed cotton yield, from its temporal and spatial composition points of view, was mainly contributed by boll setting stages before August 7 and boll setting positions at inner sites of branches from 6 to 10, respectively. However, the performance of seed cotton yield contributed by outer sites of branches below 10 significantly affected the heterosis of final seed cotton.