转育玉米大斑病抗病单基因Ht的实用性初探

the Preliminary Study on the Practicable of Translating Disease-resistant Monogene Ht of Gorn Northern Leaf Blight

对玉米自交系Mo17转育抗病单基因Ht_2、Ht_3,培育出Mo17的6个近等基因系,通过温室及田间人工接种玉米大斑病菌鉴定及配合力测定.得出在利用多基因抗性的基础上同时转育单基因Ht_1、Ht_2、Ht_3、Ht_N,把单基因尽可能集中到一个自交系或杂交种上;形成“多质系”或“多系品种”,因而具有兼抗多个生理小种的作用,从而延长杂交种的使用寿命.”

Six near-isogenic lines have been developed by diverting diseae-resistant monogenes Ht2,Ht3 to corn inbred line Mo17 in backcross-breeding. From artificial inoculating corn northern leaf blight under greenhouse and field and measuring the combining ability we concluded the multiple-quality line or multiple-line variety was developed by translating monogenes Ht1,Ht2,Ht3 and Htn based on polygenic resistance and concentrating the monogenes on an inbred line or a hybid as far as possible. This strain or variety could lengthen service life of the hybrid strain because they played a role in resisting many biological races simultaneously.