棉花陆海染色体片段代换系BC_7F_2群体纤维产量和品质性状表现及相关分析

Fiber Yield and Quality Traits and Their Correlation Analysis of Cotton Chromosome Segment Substitution Lines Population(BC_7F_2) from Gossypium hirsutum L.×Gossypium barbadense L.

为了揭示棉花染色体片段代换系BC_7F_2纤维产量性状和品质性状之间的相关关系,筛选纤维品质优异的新材料。以1套陆海染色体片断代换系为材料,对BC7F2高代回交群体的产量性状与纤维品质性状的表性数据进行评价及偏相关分析。结果表明:群体各性状的平均值接近于轮回亲本‘中棉所36’,群体内存在丰富的遗传变异。纤维上半部平均长度超轮回亲本比例为30.25%,断裂比强度超轮回亲本比例为71.25%,衣分超轮回亲本比例为29.38%。总体上单铃重与马克隆值、整齐度指数呈极显著正相关,衣分与上半部平均长度、断裂比强度呈显著负相关,与单铃重呈极显著负相关。从中筛选出部分纤维品质突出的单株,纤维上半部平均长度高于30.00 mm,断裂比强度高于31.00 cN/tex。

The aims are to reveal the relationship between fiber yield and quality traits of cotton chromosome segment substitution lines （BC7F2）, and select the new materials with excellent fiber quality. The cotton chromosome segment substitution lines （BCTF2） from Gossypium hirsutum L. x Gossypium barbadense L. were used as materials. Fiber yield and quality traits of advanced backcross populations BC7F2 were evaluated and analyzed using partial correlation. The results showed that the average values of the traits in the populations were near to that of the recurrent parent ＇Zhongmiansuo 36＇, and the abundant genetic variations existed in populations. The transgressive segregation over the recurrent parent ＇ Zhongmiansuo 36＇ was 30.25%, 71.25%, 29.38% for fiber length, fiber strength and lint percentage, respectively. Boll weight was very significantly positive-correlated with fiber micronaire and fiber uniformity. Lint percentage was negatively correlated with fiber length and fiber strength of the top half, while lint percentage was very significantly negative-correlated with boll weight. Plenty of individual plants with superior fiber quality were selected. The average length of the top half fiber was more than 30.00 mm, and fiber strength was more than 31.00 cN/tex.