关键词: 玉米, 隐性br-2基因, 矮化育种, 定向选择

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 words: maize, monogenic br-2, dwarf breeding, select in direction