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前言中国农业科学院作物所水稻研究室采用花培技术和抗病基因分析方法,通过日本抗病品种砦2号(具Pi—z~t、Pi—a基因)与我国高产品种京系17杂交,育成在北方地区大面积推广的丰产高抗优质品种中花9号.砦2号是印度籼稻品种CO25与日本品种农林8号杂交,再用农林8号作轮回亲本,经5次回交育成的粳型品种.日本学者清泽茂久对砦2号进行了抗病基因分析,确定该品种具有Pi—z~t和Pi—a两个抗病基因.砦2号无论在日本还
Preface The Chinese Academy of Agricultural Sciences Crop Research Institute of Rice uses the flower culture techniques and disease resistance gene analysis methods, through the hybridization of japonica resistant variety Zhai 2 (Pi-z ~ t, Pi-a gene) and our high-yielding variety Beijing 17, Bred into large-scale popularization and high-yielding variety Zhonghua No.9 in the north of China.Zhai No. 2 was a cross between Indian indica variety CO25 and Japanese variety Nonglin 8 and then with Nonglin 8 as a recurrent parent, Type species.Japanese scholars Qingze Mao-long on the Walled 2 on the resistance gene analysis to determine the varieties have Pi-z ~ t and Pi-a two resistance genes.Zhai 2 No matter in Japan