秋淋对转基因抗虫棉产量形成的影响

在2003—2004年秋淋灾害年，对早熟类棉花品种中棉所45和33B及中熟类棉花品种中棉所41和SGK321的产量形成进行了对比研究。结果表明，后期阴雨寡照，导致烂铃增多，早衰加重。棉株上部和外围成铃率不足10%，早熟棉花烂铃率达25.4%，比中熟棉花高4倍多，失去早发优势，10月10日早熟棉花收获量比中熟棉花减产31.1%。中熟棉花伏桃比例较高，7月集中成铃性强，与关中棉区最佳成铃期吻合，对关中棉区秋淋发生率高的生态环境有较好的适应性。

Effect of Autumn -rainy on Yield Formation of Transgenic Cotton

The yield formation of some early-mature cotton varieties, as CCCR45 and 33B, and of some middle-mature cotton ones, as CCCR41 and sGK321, were analyzed in rainy autumn days during 2003 to 2004 year. The experiment results showed that the mildew and rot boll grew in number, plant decrepitude shifted to an earlier time and became heavier in the cloudy weather and rainy day of later season. The useful cotton boll rate at upper and outer parts on the plant was less than 10%, rot cotton boll rate of early-mature cotton was raised by 25.4%, which was 4 times higher than that of middle-mature one. In this case, the dominance of the precociousness of early-mature cotton had lost completely. Before 10 October, the harvest yield number of middle-mature cotton, which had clear superiority of boll formation on July, had increased 31.1% than that of early-mature one. Having the disposition of branches and leaves had to make a display of open and clear characteristic, the middle-mature cotton was identical with the optimum boll formation period of middle of Shaanxi province, which had good adaptability to the ecological environment of autumn-rainy days frequently being occurrence in this cotton region.