Identification of a Cytoplasmic Male Sterile Line NEA in Brassica napus L. and Its Genetic Studies

<正> Male sterile NEA plants were identified in progenies of the radiated 92P× Aggregate-silique in Brassica napus L. in 1993. Their progeny plants from test crossing and open pollination were 100% male sterile. The double-low male sterile lines JL-4 and JL-18 were bred through successive backcrossing of the double -low variety No.4 and No. 18 in Brassica napus L.to NEA. Restorer lines 6720 and 6722 with significant