Auxin synthesis genes in pRiA4 and pRi1855 were cloned separately in binary vectors and introduced into Chinese cabbage (Brassica pekinensis), cabbage (Brassica oleracea var. capitata) and cauliflower (Brassica oleracea var. botrytis). The functions of these genes were investigated in root induction, root growth and plant phenotype. Both sets of auxin genes initiated root formation on hypocotyl segments and cotyledon explants after infection by Agrobacterium strains LBA4404auxA and LBA4404auxB. For Chinese cabbage and cabbage, the root initiation was polar since roots proliferated usually on basal ends of the explants. For cauliflower, rooting was not polar in that roots were observed on both ends (basal and apical ends) of hypocotyl segments. Addition of 3μM indole-3-acetic acid (IAA) to the ctilture medium resulted in the loss of polar rooting of Chinese cabbage and cabbage. Between transformed root lines and between transgenic plant lines were the considerable difference in growth pattern. The former was classified into four typer according to root length and number of branch roots while the latter sorted into three groups on the basis of plant phenotype. Most of the transgenic plants had slighdy wrinkled leaves. The leaf sections, dissected from transgenic plants, were cultured in the absence of hormone and rooting was observed for most of transgenic plants. From the population of transgenic plants, three lines of Chinese cabbage and cabbage were screened, that characterized with strong root systems, early initiation of leaf heads and fast growth.