甘蓝型油菜隐性细胞核雄性不育系LY31AB的选育及利用

Breeding and utilization of recessive genic male sterile line LY31AB in Brassica napus L.

为充分利用细胞核雄性不育的优势,以甘蓝型油菜‘Q1012’商品油菜籽为来源,用系谱选育法选育出双低优质甘蓝型油菜隐性细胞核雄性不育系LY31AB,分析其育性、抗性、配合力等特点,并进行杂种优势利用。结果表明:LY31AB不育性遗传稳定,受2对隐性重叠基因控制,且在田间表现出良好的菌核病抗性和抗倒性;LY31AB配合力高、恢复源广、杂种优势强,其所配组合大多表现出明显的杂种优势;利用LY31AB育成并登记的乐油8号、得乐油1632、万家油520、乐油7号4个双低优质油菜新品种也均表现出菌核病抗性和良好的抗倒性,已被大面积推广应用。综上所述,LY31AB是一个选育系谱清楚、遗传性状稳定、品质优、丰产性好、抗性好、配合力高、恢复源广且具有良好杂种优势利用价值的不育系,有着广阔的应用前景。

In order to make full use of the advantages of genic male sterility(GMS),the commercial rapeseed‘Q1012’of Brassica napus L.was used as the source to select the double-low and high-quality recessive GMS line LY31AB of B.napus by the pedigree breeding method.LY31AB fertility,resistance,combining ability and other characteristics were analyzed and its heterosis was utilized.The results indicated that the sterility of LY31AB was genetically stable,which was controlled by two pairs of recessive overlapping genes,and showed good resistance to sclerotinia disease and lodging resistance in the field.LY31AB had high combining ability,wide recovery sources and strong heterosis,and most of its combinations showed obvious heterosis.Four new double-low and high-quality rape varieties,Leyou 8,Deleyou 1632,Wanjiayou 520 and Leyou 7,which were bred using LY31AB and registered,also showed good resistance to sclerotinia disease and lodging resistance,and were widely in promotion and application.To sum up,LY31AB is a sterile line with clear pedigree,stable genetic characters,good quality,good fertility,good resistance,high combining ability,wide recovery sources and good heterosis utilization value,and has broad application prospects.