Breeding of the Brassica napus cultivar Huyouza 4, a recessive genic male sterile (GMS) hybrid with double low content in rapeseed.

The B.napus cultivar Huyouza 4 is a three way hybrid with double low content in rapeseed bred by using recessive epistatic interactive genic male sterility and has such characteristics as high and stable yield and resistence to sclerotiniose and virosis.Its average seed yield was 2 674.5 kghm2 in Shanghai rapeseed regional test,2 590.4 kghm2 in the national rapeseed regional test of the lower reaches of the Yangtze River,and 2 520.0 kghm2 in the national rapeseed production test of the lower reaches of the Yangtze River,increasing by 6.0%,5.54% and 8.75% over check varieties Huyou 15,Qinyou 7 and Qinyou 7,respectively.Its oil content is 44.63% in seed,erucic acid content is 0 in oil,and glucosinolate content is 29.61 μmolg in meal.