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Applied Microbiology and Biotechnology

, Volume 97, Issue 20, pp 9087–9098 | Cite as

The pH signaling transcription factor PacC is required for full virulence in Penicillium digitatum

  • Tianyuan Zhang
  • Xuepeng Sun
  • Qian Xu
  • Luis González Candelas
  • Hongye LiEmail author
Applied genetics and molecular biotechnology

Abstract

Penicillium digitatum is the most important postharvest pathogen of citrus fruits. Along disease progression, the infected citrus peel tissue is acidified due to the accumulation of organic acids. So far, relatively little is known about the environmental factors that regulate pathogenicity in this fungus. In this study, the role of the pH signaling transcription factor PacC in the pathogenesis of P. digitatum was investigated. We identified the pacC ortholog (PdpacC) in P. digitatum and found that its transcript levels were elevated under alkaline conditions (pH ≥ 7) in vitro, as well as during the infection of citrus fruits in spite of the low pH (about 3.0 to 3.5) of the macerated tissue. Na+ and pectin also induced the expression of PdpacC. Disruption of PdpacC resulted in impaired mycelial growth under neutral or alkaline pH conditions and on synthetic medium supplemented with pectin as the sole carbon source, and attenuated virulence towards citrus fruits. Introducing the full length of PdpacC into the ΔPdpacC mutant restored all these phenotypes. The expression of the polygalacturonase gene Pdpg2 and pectin lyase gene Pdpnl1 in P. digitatum was upregulated in the wild type strain but not or weakly upregulated in the ΔPdpacC mutant during infection. Disruption of Pdpg2 also resulted in attenuated virulence of P. digitatum towards citrus fruits. Collectively, we conclude that PdPacC plays an important role in pathogenesis of P. digitatum via regulation of the expression of cell wall degradation enzyme genes, such as Pdpg2 and Pdpnl1.

Keywords

Penicillium digitatum pH signaling transcription factor Virulence Cell wall degradation enzyme genes 

Notes

Acknowledgments

This work was supported by the National Foundation of Natural Science of China (31071649), China Agriculture Research System (CARS-27) and the Special Fund for Agro-scientific Research in the Public Interest (201203034).

Supplementary material

253_2013_5129_MOESM1_ESM.pdf (1014 kb)
ESM 1 (PDF 1014 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Tianyuan Zhang
    • 1
  • Xuepeng Sun
    • 1
  • Qian Xu
    • 1
  • Luis González Candelas
    • 2
  • Hongye Li
    • 1
    Email author
  1. 1.Institute of BiotechnologyZhejiang UniversityHangzhouChina
  2. 2.Instituto de Agroquímica y Tecnología de Alimentos (IATA-CSIC)PaternaSpain

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