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回交育种是以轮回亲本为主体,进行品种改良的育种方法。此种方法是根据轮回亲本存在的一两个缺点,选择适宜的对手亲本进行杂交,然后再用轮回亲本做父本回交1—2次,即可获得综合性状的接近轮回亲本,同时又具备了需要改进的优良性状的新品种。其特点是,杂交后代分离小,稳定快,育种年限短,能够保持轮回亲本的丰产性和适应性。利用回交育种法改良小麦品种,已有成功的事例,六十年代北京农业大学用农大183做轮回亲本,与抗条锈亲本伊利亚杂交,再回交1
Backcross breeding is based on reincarnation of the parent as the mainstay, breeding varieties improved varieties. This method is based on the existence of reincarnated parent one or two shortcomings, select the appropriate opponent parents for hybridization, and then use the recurrent parent father to backcross 1-2 times, you can get the composite traits of the reincarnated parents, but also have The need for improvement of the fine traits of new varieties. Its characteristics are that the offspring of hybrids are small and stable, the breeding period is short, and the progenies of the reincarnation can maintain the high yield and adaptability of the reincarnated parents. Backcross breeding method to improve wheat varieties, there have been successful cases, the Beijing Agricultural University in the 1960s with the National Agricultural University 183 do reincarnation parents, and anti-stripe rust parent Iliya hybrid, and then pay 1