高衣分染色体片段导入系IL-10-1衣分形成的研究

Study on Lint Percentage Formation Mechanism of Chromosome Segment Introgression Line IL-10-1 with High Lint Percentage

以高衣分染色体片段导入系IL-10-1以及背景亲本陆地棉遗传标准系TM-1和供体亲本海岛棉H7124为试验材料,用扫描电镜观察了纤维初始发育的特征,测定了单粒种子成熟纤维总重量、纤维平均长度、单位长度纤维重量和纤维总根数并分析了IL-10-1高衣分形成的原因。扫描电镜观察的结果表明,纤维突起启动的早晚与基因型关系密切,纤维伸长起始的早晚与衣分关系密切,较早的纤维伸长启动有利于高衣分的形成。高衣分导入系IL-10-1单粒种子成熟纤维总质量、纤维平均长度、单位长度纤维质量和纤维总根数均极显著高于TM-1。相关性分析和通径分析结果证明:纤维总质量、单位长度纤维质量和纤维平均长度与衣分关系密切。因此,材料较早的启动纤维突起和开始纤维伸长利于优良品质和高衣分的形成。

Abstract The chromosome segment introgression line （CSIL） IL- 10 -lwith high lint percentage, its acceptor parent Gossypium hirsutum genetic standard line TM - 1, and donor parent Gossypium barbadense H7124 were used as experimental materials to study the relationship between the characteristics of fiber initiation development and final lint percentage. The characteristics of fiber elongation initiation were investigated by scanning electron microscopy （SEM）. The total weight per seed, average length, weight per length unit and number per seed of mature fiber were measured. The results showed that the time of fiber elongation initiation was highly correlated with lint percentage, the earlier initiation of fiber elongation was benefit to the for-mation of higher lint percentage. The total weight per seed, average length, weight per millimeter and number per seed of mature fiber of IL - 10 - 1 were all significantly higher than those of TM - 1. The correlation and path analysis showed that the total weight per seed, weight per millimeter and average length of mature fiber had close correlation with lint percentage. In conclusion, earlier protrusion and elongation initiation of fiber were propitious to the formation of good quality and higher lint percentage.