The differentiation of sepal and petal morphologies in Commelinaceae

Toshinori Ochiai, Toru Nakamura, Yasuki Mashiko, Tatsuya Fukuda, Jun Yokoyama, Akira Kanno, Toshiaki Kameya

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


The morphological transition of the first whorl of tepals into sepals occurs frequently during the diversification of angiosperms. Such transitions may play important roles in pollination modes. The B class genes, APETALA3 (AP3) and PISTILLATA (PI) in Arabidopsis thaliana and GLOBOSA (GLO) and DEFICIENS (DEF) in Antirrhinum majus, are required for the development of petals in the second whorl, and its homologs have been isolated and characterized from various plants. A recent study on tulip, a monocotyledonous plant, indicates that the morphology of petaloid tepals in the first and second whorls is consistent with the expansion of B class gene expression. Here, we report five B class genes, TRGLOA, TRGLOB, CCGLO, TRDEF and CCDEF, isolated and characterized from two commelinaceous plants, Tradescantia reflexa and Commelina communis, with distinct sepal and petal morphologies in monocots. Northern blot analysis and gene-specific reverse transcription-polymerase chain reaction (RT-PCR) studies using dissected floral organs reveal a lack or low level of DEF-like gene expression in these commelinaceous species in the first whorl, in contrast to previous results. The expression data suggest that DEF-like gene expression in Commelinaceae correlates with the production of petaloid organs in the first whorl.

Original languageEnglish
Pages (from-to)253-262
Number of pages10
Issue number2
Publication statusPublished - 2004 Dec 22


  • ABC model
  • Commelinaceae
  • DEF-like genes
  • GLO-like genes
  • Modified ABC model
  • Petal
  • Sepal


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