Genetica

, Volume 128, Issue 1–3, pp 429–438

Molecular evolution and functional specialization of chalcone synthase superfamily from Phalaenopsis Orchid

  • Ying-Ying Han
  • Feng Ming
  • Wei Wang
  • Jing-Wen Wang
  • Ming-Ming Ye
  • Da-Leng Shen
Article

Abstract

Plant genomes appear to exploit the process of gene duplication as a primary means of acquiring biochemical and developmental flexibility. The best example is the gene encoding chalcone synthase (CHS, EC2.3.1.74), the first committed step in flavonoid biosynthesis. In this study, we examined the molecular evolution of three CHS family members of Phalaenopsis including a novel chs gene (phchs5), which is slowly evolved. The inferred phylogeny of the chs genes of Phalaenopsis with other two orchid plants, Bromoheadia finlaysoniana and Dendrobium hybrid, suggested that gene duplication and divergence have occurred before divergence of these three genera. Relatively quantitative RT-PCR analysis identified expression patterns of these three chs genes in different floral tissues at different developmental stages. Phchs5 was the most abundantly expressed chs gene in floral organs and it was specifically transcribed in petal and lip at the stages when anthocyanin accumulated (stage1–4). Phchs3 and phchs4 were expressed at much lower levels than phchs5. Phchs3 was expressed in pigmented tissue (including lip, petal and sepal) at middle stages (stages 2–4) and in colorless reproductive tissue at late stage (stage 5). Phchs4 was only expressed in petal at earlier stages (stage 1–3) and in lip at middle stage (stage 4). These results present new data on differentiation of gene expression among duplicate copies of chs genes in Phalaenopsis.

Keywords

Chalcone synthase Expression regulation Gene duplication Phalaenopsis Phylogenetic 

Abbreviations

CHS

chalcone synthase

PCR

polymerase chain reaction

RT

reverse transcriptase

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Copyright information

© Springer 2006

Authors and Affiliations

  • Ying-Ying Han
    • 1
  • Feng Ming
    • 1
  • Wei Wang
    • 1
  • Jing-Wen Wang
    • 1
  • Ming-Ming Ye
    • 1
  • Da-Leng Shen
    • 1
  1. 1.Institute of Genetics, State Key Laboratory of Genetic Engineering, Research Centre of Gene Diversity and Designed Agriculture, Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, School of Life ScienceFudan UniversityShanghaiChina

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