GENETIC ANALYSIS OF CYTOPLASMIC MALE STERILE LINE L160A IN RAPESEED (BRASSICA NAPUS L.)

The inheritance of L160A, a newly bred cytoplasmic male sterile (CMS) line of rapeseed ( Brassica napus L.), its relationship with pol CMS lines and sterile line Shan-2A, and the allelism between the fertility restoring genes of its restorer L160R-1, on the one hand, and of the restorer lines L17C, Hunan-Huayehui and KenC1, on the other, were analyzed. The inheritance of sterility in L160A was found to be controlled by a pair of recessive gene with the modification of some minor genes. The properties of fertility restoration and sterility maintenance in it were similar to those in pol CMS lines L17A and Xiang'ai-A and in the sterile line Shan-2A. The fertility-restoring gene in L160R-1 was identified as allelic with those of L17C (the restorer of L17A) and Hunan Huayehui (the restorer of Xiang'ai-A). Whether allelism exists between the fertility restoring genes of L160R-1 and Ken-C1 (the restorer on Shan-2A) remains unsettled and molecular marker techniques have to be employed in further study.