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The YABBY family are a group of seed plant-specific transcription factors, which are involved in the specification of abaxial polarity in lateral organs. In  Arabidopsis thaliana ,  YABBY3  ( YAB3 ) plays a critical role in regulating abaxial patterning, growth of lateral organs, and inflorescence phyllotaxy. In this study, the  BcYAB3  gene was isolated from Pak-choi ( Brassica rapa  subsp.  chinensis ). The tissue-specific expression analysis indicated that the  BcYAB3  gene has significantly high transcript levels in stem, leaf, and flower. We investigated the subcellular localization of BcYAB3 and found the protein to be expressed in the nucleus. In the transgenic  Arabidopsis   thaliana  plants expressing the  BcYAB3  gene, the leaves were curling downward with the plant growth, and the bolting and flowering stages were delayed. These results not only validate the function of  BcYAB3  in the leaf and flower development in  Arabidopsis , but also contribute to unravel the molecular regulatory mechanism of  YAB3  gene in the establishment of adaxial–abaxial polarity of the lateral organs in Pak-choi.

Ectopic Expression of a Pak-choi YABBY Gene, BcYAB3, Causes Leaf Curvature and Flowering Stage Delay in Arabidopsis thaliana