Biological control of Alternaria solani by tomato epiphyte yeasts and investigation of some their biocontrol mechanisms

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Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
Early blight disease (is caused by Alternaria solani Sor) is a limiting factor in tomato production and various studies showed that yeasts are potential for biocontrol of these diseases. The present study aims is to demonstrate the antagonistic effect of the tomato epiphytic yeasts on the mycelial development of A. solani and study their mode of action. In vitro, seventeen epiphytic yeast strains of tomato were evaluated against A. solani. Results showed that 15 isolate are able to control of A. solani. In the postharvest experiments, the abilities of yeast strains to reduce the severity of A. solani on tomato fruit rot were conducted. In vitro two isolates of Aureobasidium pullulans (N3 and N4) reduced the fruit rot over than 85%. Results of the study on biocontrol mechanisms showed that all tested isolates except isolates N14 and N15 were able to significantly inhibit the growth of A. solani through the formation of volatile compounds (VOCs). Study on the ability of isolates to produce enzymes, sidrophore and formation of biofilm showed that five isolates were able to produce pectinase, four isolates were able to produce amylase, five isolates produced protease, five isolates were able to produce siderophore and seven isolates were able to form biofilm. In conclusion, our results confirm the potential of A. pullulans (N3, N4) as biocontrol agents against A. solani and suggested it as a suitable option for controlling postharvest diseases of tomatoes.
Language:
Persian
Published:
نشریه کنترل بیولوژیک آفات و بیماری های گیاهی, Volume:12 Issue: 1, 2023
Pages:
95 to 110
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