甘蓝型油菜优质高配合力质不育系南A6的选育与应用

本研究拟改良已有高配合力甘蓝型油菜细胞质雄性不育系的品质，以不育系南A2作母本、双低品系92-2作父本测交并连续回交，结合品质定向选择和配合力分析，加速优质不育系选育速度。研究结果：成功选育出低芥酸低硫苷不育系南A6。南A6于2002年3月通过四川省农作物品种审定委员会组织的鉴定，具有不育性稳定、品质优、一般配合力高、农艺性状优良、异交结实率高、抗逆性强、适应性广等特点，与6个恢复系配制出2个高产组合和4个优质组合通过省级或国家审定。研究结果表明不育系南A6已成为四川省油菜雄性不育杂种优势利用的主体不育系，具有广阔的应用前景。

Breeding and Application of a Cytoplasmic Male Sterile Line Nan A6 With High Quality and Good Combining Ability in Brassica Napus L.

This study intended to improve the quality of the existing cytoplasmic male sterile （CMS） line in Brassiea napus with high combining ability. The CMS line Nan A2 was used as female parent, crossed and continuous backcrossed with the conventional double low strain 92-2. Meanwhile, quality direetional selection in progenies and combining ability analysis on advanced generations were adopted to accelerate the selective breeding speed of male sterile line. The results of the study were as follows. Nan A6, a new cytoplasmic male sterile line with low erucic acid and low glucosinolate, was successfully bred. It passed the examination organized by Sichuan Provincial Crop Variety Approval Committee in March 2002. It had the characteristics of stable sterility, good quality, high general combining ability, excellent agronomic traits, high outcrossing rate, strong resistance （tolerance） of lodging and diseases, wide adaptability. And Nan A6, crossed with six restorer lines, had made out of two high-yield combinations and four high-quality combinations authorized by the Provincial or National Crop Variety Approval Committee subsequently. The study indicated that Nan A6 had become one of main sterile lines in male sterile heterosis utilization in Siehuan Province, and had broad application prospects.