Biocontrol of green mold decay in Jincheng citrus fruits by Pseudomonas fluorescens ZX

Abstract:

[Objective] Researches were carried out for biocontrol of green mold decay in citrus by Pseudomonas fluorescens ZX. [Methods] The biocontrol effectiveness in fruits and effects on Penicillium digitatum growth were evaluated along with the antifungal activity of volatile organic compounds (VOCs). Meanwhile, assays of competitive grow between Pseudomonas fluorescens ZX and Penicillium digitatum were conducted, as well as the growth curve and biofilm formation ability of Pseudomonas fluorescens ZX. [Results] Pseudomonas fluorescens ZX suspension showed potent ability for the depression of Penicillium digitatum, so did the VOCs. In addition, Pseudomonas fluorescens ZX made better use of nutrients than Penicillium digitatum, and it entered the logarithmic growth stage quickly (4 h) and formed an effective biofilm after 24 h. [Conclusion] The application of Pseudomonas fluorescens ZX was effective to control green mold, and the potential mechanisms included inhibition of spore germination, competition for nutrients and space, and formation of biofilm.