Qianyou 2 AB originated from the mutant of Youyan 2, which is a famous variety with low erucic and glucsinolate content. In order to obtain this dominant nucleic male sterile line in B.napus the way of continuous selection of paired sib mating was used under the conduct of field and indoor quality selection. Qianyou 2 AB possesses many advantages, such as low erucic acid content (<1%),low glucosinolate content(<30 μmol/g), high oil content (>40%), distinct sterility which isn't effected by environment, goo...