隐性单基因br_2玉米矮生系的选育.pdf

中国农业科学 2009,42(8):2978-2981 Scientia Agricultura Sinica doi: 10.3864/j.issn.0578-1752.2009.08.042 隐性单基因br-2玉米矮生系的选育 何 川，郑祖平，谢树果，李 钟，刘代惠 （国家玉米产业技术体系南充试验站/ 四川省南充市农业科学研究所，四川南充 637000 ） 摘要：【目的】研究单基因br-2玉米矮源导入热带血缘选育矮生玉米自交系的效果。【方法】利用玉米br-2 基因的致矮特性，根据基因重组的原理，通过导入热带血缘进行回交选择。【结果】选育出配合力高的单基因br-2 矮生系南381、南387，组配的玉米杂交种南玉8号和隆单 9号先后通过四川省审定，正在中国南方大面积推广应 用。【结论】利用隐性矮生基因导入热带血缘，使抗病、抗倒、窄叶片等优良基因与 br-2 基因良好结合，克服了 矮生自交系节间短、叶宽重叠密集、授粉不良等缺点，在玉米育种研究上具有一定的应用前景。 关键词：玉米；隐性br-2基因；矮化育种；定向选择 Breeding of the Maize Monogenic br-2 Dwarf Lines HE Chuan, ZHENG Zu-ping, XIE Shu-guo, LI Zhong, LIU Dai-hui (National Maize Industry Technology System Nanchong Experiment Station/Nanchong Institute of Agricultural Science, Nanchong 637000, Sichuan) Abstract: 【Objective 】 The experiment was conducted to study the effects of breeding dwarf maize inbred lines by using the introduced tropical germplasm with monogenic br-2. 【Method 】 Utilizing the gene br-2 in maize controlling the dwarf characteristic, based on the principle of gene recombination, backcross of selection was made through introduction of tropical germplasm. 【Result 】 The main results showed that the dwarf lines Nan381 and Nan387 gave excellent combining ability. As to the breeding method, the hybrids Nanyu8 and Longdan9 have been examined and are widely extended in Southern China. 【Conclusion 】 Monogenic br-2 was recombined with some genes controlling desirable agronomic characters, such as disease resistance, lodging resistance and narrow leaf, and the disadvantages of original br-2 inbred lines were overcome, including short internode, wide and dense leaves, high barrenness, which could be used for maize breeding in the future. Key wo