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Original Article

JVS. 2019; 6(1): 67-82

Efficacy of the sterile fungus GU23-3 on growth characters of cucumber plants and resistance against Papaya ring spot virus

Shimaa A Khalaf,Mohsen Mohamed Elsharkawy,Samir Armia Sidaros,Shawky A El Kewey,Ayman F Omar,Ali Hamed.

Papaya ring spot virus (PRSV) is a major threat to the production of cucurbits all over the world. The sterile fungus GU23-3 is a rhizosphere fungus conferring positive effects on plant growth and health.
The aim of this study is to evaluate the effects of GU23-3 on cucumber growth and resistance against PRSV.
Disease severity and virus titer were evaluated in cucumber plants treated with barley grain (BGI) or culture filtrate (CF) of GU23-3 under greenhouse conditions. Additionally, the expression levels of defense genes were assessed by reverse transcription PCR (RT-PCR) analysis.
Both of virus severity and titer were significantly reduced in treated plants in comparison with the control. All growth characters and yield of cucumber plants were increased in GU23-3 treated plants than the control. RT-PCR analysis revealed increased expressions of different pathogenesis related genes (Chitinase, β 1-3 Glucanase, PR1, POX, PAL and LOX) explaining the role of these genes in the mechanism of induced resistance against PRSV by GU23-3.
GU23-3 could be considered a new and alternative strategy to control PRSV infection.

Key words: Papaya ring spot virus; induced resistance; plant growth promoting fungi; cucumber; RT-PCR.

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