Oilseed is Brassica of Cruclferae, is one of main oil crops in the world and holds an important status in the oil crops. In our country, it is the most important of the five oil crops (oilseed, soybean, peanut, gingili, and sunflower), the largest planting area and the most products. It is an important source to the vegetable oil and meal protein and industry material. Brassica include three elementary species (Brassica campestris, AA 2n=20; Brassica oleracea CC, 2n=18 and Brassica nigra, BB, 2...