The invention discloses a
Brassica napus, parent species Chinese cabbage, cabbage MYBL2 (v-
myb avian myeloblastosis
viral oncogene homolog-like 2)
gene family. The Chinese cabbage MYBL2
gene family comprises a BrMYBL2-1
gene and a BrMYBL2-2 gene. The cabbage MYBL2
gene family comprises a BoMYBL2-1 gene and a BoMYBL2-2 gene. The
Brassica napus MYBL2
gene family comprises a BnMYBL2-1 gene, a BnMYBL2-2 gene, a BnMYBL2-3 gene, a BnMYBL2-4 gene. Eight MYBL2 genes have higher homology. The invention also discloses the application of the above gene families in
molecular breeding with characters, such as
plant seed coat color, seed coat thickness and the like. After a just overexpression
plant carrier is built and double 10 number in the black
Brassica napus variety, the Brassica napus is compared with the contrast of the explant of a non-transgenosis, transgenosis plants normally grow and develop, pigments such as Proanthocyanidins in the seed coat are reduced, and meanwhile the seed coat becomes thin to form the transgenosis yellow seed character.