甘蓝型双低油菜细胞质雄性不育系宁A7的选育研究Ⅰ.MICMS双低不育系宁A7的回交选育

Studies on Breeding of Double-low Cytoplasmic Male Sterile Line Ning A7 in Brassica napus L.Ⅰ.Breeding of Double low MICMS Line Ning A7 by Backcross

以农艺性状优良、配合力高、具部分恢复基因的品系为轮回亲本 ,与MICMS双低不育系“宁A6”回交 ,定向选育具有轮回亲本优良性状和原不育系不育性的新不育系 ,经 3个轮回世代的回交、自交和测交 ,育成MICMS胞质不育系“宁A7”和保持系“宁B7”。宁A7不育系株型紧凑 ,不育性彻底 ,双低品质稳定 ,经济性状得到进一步改良。

Variety which has part of recurrent genes with superior agronomic traits and high combining ability was used as recurrent parent,to introduce its nuclear gene into double low MI cytoplasmic male sterile(MICMS) line “Ning A6” to develop new CMS line.After three cycles of backcross,selfing and test cross,a new MICMS line “Ning A7” and its maintainer “Ning B7” were bred.Ning A7 was characterized with compact plant type,complete male sterility,stable double low quality and improved economic traits. [WT5”HZ]