抗根肿病甘蓝型油菜新品种华油杂62R的选育

我国油菜根肿病发病面积在66.7万公顷左右,约占总生产面积的10%,已严重威胁到油菜的安全生产。基于此,本研究以含有CRb抗根肿病位点的大白菜材料CR Shinki为供体亲本,以甘蓝型油菜国审杂交种华油杂62的父本Pol.CMS恢复系Bing409为受体亲本,通过杂交、回交及自交等育种程序,结合前景和遗传背景筛选,将CRb抗病位点导入到Bing409中。在BC3F2代获得了遗传背景高度接近Bing409且含CRb抗病位点的抗根肿病新恢复系Bing409R,进而成功选育了我国首个抗根肿病杂交油菜新品种华油杂62R。CRb抗病位点在甘蓝型油菜背景中表现为单基因显性遗传,根肿病抗性遗传改良的同时并未对Bing409R及由其配制的杂交种华油杂62R的产量、品质造成不良影响,Bing409R及华油杂62R对我国四川、湖北、安徽等地区根肿菌生理小种具有免疫抗性。本研究的开展为我国油菜抗根肿病育种提供了宝贵资源,为我国抵抗油菜根肿病的威胁提供了重要保障。

Breeding of a novel clubroot disease-resistant Brassica napus variety Huayouza 62R

The rapeseed clubroot disease incidence in China is about 0.67 million hectare,accounting for 10%of the canola production area,which become a serious threat for the safety of Brassica napus industry.Based on this,we used CR Shinki,a Chinese cabbage material containing CRb clubroot disease resistance locus,as the donor parent,and Pol.CMS restorer line Bing409,the parent of Brassica napus national approved varieties Huayouza 62,as the recipient parent,and the CRb resistance locus was introduced into Bing409 by breeding programs such as crossing,backcrossing,self-cross with the foreground and genetic background selection.In the BC3F2 generation,a new restorer line Bing409R with a genetic background close to Bing409 containing CRb resistance locus was obtained,and Huayouza 62R,the first rapeseed hybrid resistant to clubroot disease in China was successfully developed.The results were as follows:CRb disease resistance locus appeared as a dominant single-gene inheritance in B.napus background,and the genetic improvement of resistance to clubroot disease did not at the expense of yield and quality losses for new restorer line Bing409R and its hybrid Huayouza 62R.Bing409R and Huayouza 62R were showed immune-resistance to physiological races of Plasmodiophora brassicae in Sichuan,Hubei,and Anhui provinces in China.This study will provide valuable resources for the breeding of rapeseed in China,and supplemented important support to overcome the threat of rapeseed clubroot disease.