Effects of Mixture of DPC and DTA-6 on Yield,Yield Components and Lint Quality of Transgenic Bt Cotton

This experiment was conducted in Wuqiao experimental station(located in Hebei Province)of China Agricultural University from 2004 to 2005,to investigate the effects of single application of mepiquat chloride(DPC)or in mixture with DTA-6(DPC+)on the yield,yield components and lint quality in transgenic Bt cotton with Xinza 2(XZ DPC2,hybrid Bt cotton)and Guokang 12(GK 12,conventional Bt cotton).The results indicated that DPC increased the lint yield by 4.7% in 2004 and 12.1% in 2005,respectively,whereas DPC+ increased boll numbers and boll weight more than single application of DPC,and therefore resulted 14.5% higher lint yield areraged across varieties and years.Among lint quality parameters,only micronaire value was significantly but slightly increased by DPC(except for that of GK 12 in 2005).Taken together,DPC+ is more advantageous in increasing the yield of transgenic Bt cotton compared with DPC,which enables its practical application in current cotton production in China.