%A Li,Taotao %A Wu,Qixian %A Wang,Yong %A John,Afiya %A Qu,Hongxia %A Gong,Liang %A Duan,Xuewu %A Zhu,Hong %A Yun,Ze %A Jiang,Yueming %D 2017 %J Frontiers in Microbiology %C %F %G English %K Environmental pH value,Fusarium proliferatum,Secretome,Cell wall degrading enzymes,Oxidation-reduction process %Q %R 10.3389/fmicb.2017.02327 %W %L %M %P %7 %8 2017-November-29 %9 Original Research %+ Ze Yun,Key Laboratory of Plant Resource Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences,China,yunze@scbg.ac.cn %# %! Proteomics investigation on pathogenic mechanisms of Fusarium proliferatum %* %< %T Application of Proteomics for the Investigation of the Effect of Initial pH on Pathogenic Mechanisms of Fusarium proliferatum on Banana Fruit %U https://www.frontiersin.org/articles/10.3389/fmicb.2017.02327 %V 8 %0 JOURNAL ARTICLE %@ 1664-302X %X Fusarium proliferatum is an important pathogen and causes a great economic loss to fruit industry. Environmental pH-value plays a regulatory role in fungi pathogenicity, however, the mechanism needs further exploration. In this study, F. proliferatum was cultured under two initial pH conditions of 5 and 10. No obvious difference was observed in the growth rate of F. proliferatum between two pH-values. F. proliferatum cultured under both pH conditions infected banana fruit successfully, and smaller lesion diameter was presented on banana fruit inoculated with pH 10-cultured fungi. Proteomic approach based on two-dimensional electrophoresis (2-DE) was used to investigate the changes in secretome of this fungus between pH 5 and 10. A total of 39 differential spots were identified using matrix-assisted laser desorption/ionization tandem time-of-flight mass spectrometry (MALDI-TOF/TOF-MS) and liquid chromatography electrospray ionization tandem mass spectrometry (LC-ESI-MS/MS). Compared to pH 5 condition, proteins related to cell wall degrading enzymes (CWDEs) and proteolysis were significantly down-regulated at pH 10, while proteins related to oxidation-reduction process and transport were significantly up-regulated under pH 10 condition. Our results suggested that the downregulation of CWDEs and other virulence proteins in the pH 10-cultured F. proliferatum severely decreased its pathogenicity, compared to pH 5-cultured fungi. However, the alkaline environment did not cause a complete loss of the pathogenic ability of F. proliferatum, probably due to the upregulation of the oxidation-reduction related proteins at pH 10, which may partially compensate its pathogenic ability.