Abstract
Abstract B sister 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. B sister MADS-box proteins display important regulatory functions in seed coat development, fruit development, and proanthocyanidin biosynthesis. Therefore, genes encoding B sister 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 B sister MADS-box proteins is discussed.
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