陆地棉杂交种二代竞争优势研究

Study on the Competitive Vigor for Second-generation Upland Cotton Hybrids

选用陆地棉人工杂交制种 F_1代产量具有竞争优势的杂交组合,对其 F_1、F_2代的增产因素、纤维品质、苗期(二叶期)干、鲜重进行分析,结果表明:(1)F_1代产量具有竞争优势的主要因素是铃数的增加,比对照增加20%～40%,并在 F_2代中仍起主要作用,比对照增加10%～40%,铃重、衣分在二代中竞争优势较小。(2)比强、绒长、麦克隆值 F_1、F_2代和对照无明显差异,而整齐度大部分组合 F_2代有所下降,但对纺纱影响不大。(3)F_1代种子活力指数明显高于 F_2代和对照,而苗期干、鲜重 F_1、F_2代无显著差别,但均明显高于对照,表现出较强的苗期生长竞争优势。据此,棉花杂种 F_2代具有一定的杂种优势,并有利用价值。

F_1 hybrids with competitive vigor by hand-emasculation and their F_2 were selected as study materials.The results showed that:(1)In F_1 and F_2 hybrids,much of the lint yield increases were at- tributable to better number of boll per plant,and boll size,lint perent showed less competitive vigor.(2)No differences in fiber length,strength,Micro-value between F_1 and F_2 hybrids were detected,F_2 hybrids showed lower fiber uniformity.(3)F_1 hybrids seed activity indexes were notable higher than those of F_2 and check,but there were no significant difference in seedling dry and fresh weight between F_1's and Fz's which were significant higher than check.