Planta

, Volume 232, Issue 1, pp 245–255 | Cite as

Anthocyanin biosynthesis in pears is regulated by a R2R3-MYB transcription factor PyMYB10

  • Shouqian Feng
  • Yanling Wang
  • Song Yang
  • Yuting Xu
  • Xuesen Chen
Original Article

Abstract

Skin color is an important factor in pear breeding programs. The degree of red coloration is determined by the content and composition of anthocyanins. In plants, many MYB transcriptional factors are involved in regulating anthocyanin biosynthesis. In this study, a R2R3-MYB transcription factor gene, PyMYB10, was isolated from Asian pear (Pyrus pyrifolia) cv. ‘Aoguan’. Sequence analysis suggested that the PyMYB10 gene was an ortholog of MdMYB10 gene, which regulates anthocyanin biosynthesis in red fleshed apple (Malus × domestica) cv. ‘Red Field’. PyMYB10 was identified at the genomic level and had three exons, with its upstream sequence containing core sequences of cis-acting regulatory elements involved in light responsiveness. Fruit bagging showed that light could induce expression of PyMYB10 and anthocyanin biosynthesis. Quantitative real-time PCR revealed that PyMYB10 was predominantly expressed in pear skins, buds, and young leaves, and the level of transcription in buds was higher than in skin and young leaves. In ripening fruits, the transcription of PyMYB10 in the skin was positively correlated with genes in the anthocyanin pathway and with anthocyanin biosynthesis. In addition, the transcription of PyMYB10 and genes of anthocyanin biosynthesis were more abundant in red-skinned pear cultivars compared to blushed cultivars. Transgenic Arabidopsis plants overexpressing PyMYB10 exhibited ectopic pigmentation in immature seeds. The study suggested that PyMYB10 plays a role in regulating anthocyanin biosynthesis and the overexpression of PyMYB10 was sufficient to induce anthocyanin accumulation.

Keywords

Anthocyanin Asian pear PyMYB10 Transcription factor 

Abbreviations

ANS

Anthocyanidin synthase

AN2

Anthocyanin 2

BHLH

Basic helix loop helix

CHI

Chalcone isomerase

CHS

Chalcone synthase

DAFB

Days after bag removed

DFR

Dihydroflavonol 4-reductase

F3H

Flavanone 3-hydroxylase

PAL

Phenylalanine ammonialyase

SE

Standard error

Rc

Anti-eukaryotic aspartyl protease

DEPC

Diethylpyrocarbonate

CT

Threshold cycle

ABA

Acrylonitrile butadiene acrylate

MeJA

Methyl jasmonate

Notes

Acknowledgments

We thank Aoguan Fruitco Ltd. for kindly supplying pear fruit, and for harvesting and packaging of fruit. We also thank Dao-Lin Fu, Xian-Sheng Zhang, Xiang-Yu Zhao, Xiang-Bin Chen, Yu-Xiao Su, Shuai-Shuai Wang, Xiao-Liu Chen, Yu-Jin Hao, Shuang-Shuang Wang and Xing-Bin Xie for their help. This study was supported by the National 863 Program of China (2006AA100108).

Supplementary material

425_2010_1170_MOESM1_ESM.doc (38 kb)
Supplementary material 1 (DOC 37 kb)

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Shouqian Feng
    • 1
  • Yanling Wang
    • 1
  • Song Yang
    • 1
  • Yuting Xu
    • 1
  • Xuesen Chen
    • 1
  1. 1.State Key Laboratory of Crop Biology, College of HorticultureShandong Agricultural UniversityTai′anPeople’s Republic of China

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