Effects of Retention of Vegetative Branches and Removal of Early Fruiting Branches on the Growth and Development and Yield of Bt transgenic Cotton

Abstract

Abstract: Two cotton lines with varying maturity, K640 (short season cotton line) and K9918 (spring cotton line ), were grown in Jinan and Linqing in 2004 and 2005, and the effects of retention of vegetative branches (VB) plus removal of early fruiting branches (FB) on plant growth and development, and yield were examined each year. Results showed that retention of VB and removal of FB promoted the plant height and the leaf source, and the leaf area index was increased by 24-94% relative to the VB-removal control. Retention of VB plus removal of FB increased the yields of K640 by 7.4% and 15.6% in 2004 and 2005 respectively, whereas the yield of K9918 was similar to that of control in 2004, and was decreased by 12.0% in 2005. Retention of VB plus removal of FB reduced the percentage of bolls formed pre-summer, but increased those of bolls formed in summer and autumn significantly. Retention of VB plus removal of FB had no significant effect on lint percentage, but significantly affected the boll numbers per ground area and boll weight. It was concluded that effects of VB retention and FB removal on plant growth and development and cotton yield are mainly attributed to the enhanced leaf source and reduced sink/source ratio. Yield increase was only achieved when leaf source of plant population is relatively insufficient.

CLC Number:

S562

Tang Wei , Niu Yuehua , Zhang Dongmei , Li Zhenhuai , Li Weijiang , Dong Hezhong. Effects of Retention of Vegetative Branches and Removal of Early Fruiting Branches on the Growth and Development and Yield of Bt transgenic Cotton[J]. Chinese Agricultural Science Bulletin, 2006, 22(8): 178-178.

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