The Bsister MADS-box proteins have multiple regulatory functions in plant development

Bsister MADS-box proteins are a group of recently characterized MADS family transcription factors. The genes encoding these proteins have a close relationship with the male-organ-expressed class B floral homeotic genes, but are predominantly expressed in female organs. Bsister MADS-box proteins display important regulatory functions in seed coat development, fruit development, and proanthocyanidin biosynthesis. Therefore, genes encoding Bsister MADS-box proteins are potentially useful in genetic engineering of crop plants to reduce seed coat thickness and condensed tannin content. In this review, recent progress on biochemical, molecular and functional aspects of plant Bsister MADS-box proteins is discussed.