biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 62:45-54, 2018 | DOI: 10.1007/s10535-017-0763-2

Identification and functional analysis of anthocyanin biosynthesis genes in Phalaenopsis hybrids

L. M. Wang1, J. Zhang1, X. Y. Dong1, Z. Z. Fu1, H. Jiang1, H. C. Zhang1,*
1 Horticulture Research Institute, Henan Academy of Agricultural Sciences, Zhengzhou, P.R. China

Phalaenopsis species are among the most popular potted flowers for their fascinating flowers. When their whole-genome sequencing was completed, they have become useful for studying the molecular mechanism of anthocyanin biosynthesis. Here, we identified 49 candidate anthocyanin synthetic genes in the Phalaenopsis genome. Our results showed that duplication events might contribute to the expansion of some gene families, such as the genes encoding chalcone synthase (PeCHS), flavonoid 3'-hydroxylase (PeF3'H), and myeloblastosis (PeMYB). To elucidate their functions in anthocyanin biosynthesis, we conducted a global expression analysis. We found that anthocyanin synthesis occurred during the very early flower development stage and that the flavanone 3-hydroxylase (F3H), F3'H, and dihydroflavonol 4-reductase (DFR) genes played key roles in this process. Over-expression of Phalaenopsis flavonoid 3',5'-hydroxylase (F3'5'H) in petunia showed that it had no function in anthocyanin production. Furthermore, global analysis of sequences and expression patterns show that the regulatory genes are relatively conserved and might be important in regulating anthocyanin synthesis through different combined expression patterns. To determine the functions of MYB2, 11, and 12, we over-expressed them in petunia and performed yeast two-hybrid analysis with anthocyanin (AN)1 and AN11. The MYB2 protein had strong activity in regulating anthocyanin biosynthesis and induced significant pigment accumulation in transgenic plant petals, whereas MYB11 and MYB12 had lower activities. Our work provided important improvement in the understanding of anthocyanin biosynthesis and established a foundation for floral colour breeding in Phalaenopsis through genetic engineering.

Keywords: comparative genomics; gene expression pattern; petunia; regulatory genes
Subjects: anthocyanidin biosynthesis; gene expression; floral organs; flower development; transgenic plants; phylogenetic tree

Received: November 30, 2016; Revised: June 25, 2017; Accepted: June 26, 2017; Published: January 1, 2018  Show citation

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Wang, L.M., Zhang, J., Dong, X.Y., Fu, Z.Z., Jiang, H., & Zhang, H.C. (2018). Identification and functional analysis of anthocyanin biosynthesis genes in Phalaenopsis hybrids. Biologia plantarum, 62(1), 45-54. doi: 10.1007/s10535-017-0763-2
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