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[目的]旨在进一步明确该杂交棉F2代与F1代相比在产量和品质方面的下降趋势和程度,为更好地发掘和利用F2代杂种提供理论依据。[方法]以在南疆广适种植的转基因抗虫杂交棉中棉所57号的F1和F2代为试验材料,设置3种种植密度,分取6个铃位,按照《棉花种质资源描述规范和数据标准》对其进行农艺经济性状与纤维品质的调查、鉴定和评价,最终对F1和F2代杂交种进行产量比较。[结果]在铃重、衣分和子指空间分布上,F2代比F1代丰产株型的竞争优势略有减弱;纤维品质表现上,也有F2代分离造成的下降趋势,但均没有达显著性差异。[结论]最终皮棉产量,F2代则以22.5万株/hm2高密度种植为最高,F1代以18.0万株/hm2种植密度次之。
[Objective] The purpose of this study was to further clarify the declining tendency and degree of yield and quality of F2 generation and F1 generation of the hybrid cotton, providing a theoretical basis for better exploration and utilization of F2 generation hybrids. [Method] F1 and F2 generations of Zhongmiansuo No.57, a transgenic hybrid insect-resistant cotton widely planted in southern Xinjiang, were used as experimental materials. Three planting densities were set and six bolls were allocated. According to “Cotton Germplasm Description Specification And data standards ”of their agronomic economic traits and fiber quality survey, identification and evaluation, the final F1 and F2 hybrids yield comparison. [Result] The competitive advantages of F2 generation over F1 generation slightly weakened in the spatial distribution of boll weight, lint percentage and sub-index. There was also a downward trend in F2 generation but no significant difference in fiber quality difference. [Conclusion] The final lint yield was the highest in F2 generation with the highest density of 225,000 plants / hm2. The F1 generation with the density of 180,000 plants / hm2 was the second.