隐性单基因br-2玉米矮生系的选育

 【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。

Breeding of the Maize Monogenic br-2 Dwarf Lines

【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.