Study On Multilocular Heredity Of B.juncea And Interspecific Hybridization Between B.juncea And B.napus

Interspecific hybridization, an important avenue, had being used to build new genotype resource. The paper studied the heredity, yield per plant, constitutive factors of yield in B. juncea with multiloculus and crossability between B. juncea and B. napus, aimed at offering scientific basis for building new genotype by interspecific hybridization.Study on multilocular heredity of B. juncea showed the multilocular characteristic was controlled by a pair of major genes, which the recessive controlled the multilocular and the dominant controlled the dilocular, and this heredity had no cytoplasm effect except for micro-pollen.This paper studied the significance of yield per plant and constitutive factors ofyield between multilocular and dilocular rape seed which were resulted from BCi generations and parents. Performances of yield per plant and constitutive factors of yield revealed the yield per plant of multilocular rape seed significantly exceeded that of corresponding dilocular rape seed and other materials (such as Xinjie and Lajie), of which the caused reason was seeds per pod, but not pods per plant and 1000-seed weight.Seed setting, crossability, and influnce of different B.napus genotypes in interspecific hybridization between B. napusand B. Junceavith multiloculus were studied, the result showed that less full seeds were formed by reciprocal crossing, but the ability of B. Juncea XB. napus to form full seeds was stronger than that of B. napusXB. juncea; and its fertile rate and hybrid embryo development was also stronger, however there was no significant difference on ovary development after pollinating. So the way of B. juncea XB. napus should adopted in setting up new resource of interspecific hybridization. The pods rate, the fertile index, the seed index and the crossability index by reciprocal crossing between different materials in B. napusXB. juncea with multiloculus were all different, and CV of crossability index was max, so to screen genotype in B. napus with stronger crossability should aim at parent materials in B. napus with high crossability index. From the experiment, the hybrid embryo through B. juncea with multiloculus X 93-221-1 in B. napus had stronger development ability.