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采用NCⅡ遗传交配设计,选用3个陆地棉常规品种和5个陆地棉族系种质系材料杂交,杂种F_1代产量和纤维品质优势表现明显。通径分析结果表明,提高铃重、单株铃数的中亲优势,适当降低单铃种子数和株高的优势,在其它性状适宜的情况下,可以显著地提高皮棉产量的中亲优势。各个优势组合在产量优势来源上有差异。种质系材料在杂种优势利用上具有很大潜力。以累积贡献率达85％时选取前3个主成分值,依次为产量因子、纤维品质因子和铃数因子。将8个亲本用系统聚类法分为四类,第一类全都为种质系材料,表明聚类分析能够比较真实地反映亲本间的遗传差异。种质系材料与常规品种杂交亲本间遗传距离与组合优势关系十分复杂。
Using NCⅡ genetic mating design, three conventional accessions of G. hirsutum and five accessions of Gossypium hirsutum were germplasm crossed. The yield and fiber quality of F1 hybrids showed obvious advantages. The results of path analysis showed that the middle pro superiority of boll weight and boll number per plant was reduced, the superiority of single boll number and plant height was reduced appropriately, and the middle pro superiority of lint yield could be significantly improved under other suitable traits. There are differences in the sources of yield advantage for each combination of advantages. Germplasm materials have great potential in heterosis utilization. When the cumulative contribution rate reaches 85%, the first three principal components are selected, followed by yield factor, fiber quality factor and bell number factor. The eight parents were divided into four categories by systematic clustering method. The first category was all germplasm materials, which indicated that cluster analysis could reflect the genetic difference between parents more authentically. Germplasm materials and conventional varieties of hybrid parents genetic distance and the combination of relations is very complex.