Pathogenic variability in different tomato varieties (Solanum lycopersicum) based on the ITS nrDNA region

초록

Tomato (Solanum lycopersicum) is one of the major vegetable crops in the world. To satisfy various demands of people, more than 500 tomato varieties have been bred out. Most of tomato varieties are highly susceptible to some diseases such as the tomato powdery mildew. Recently, the critical and important work is the prevention and treatment of disease. In this study, 26 healthy tomato plants covering with 24 tomato varieties were collected to test the infection situation of pathogens and endophytic fungus species in order to induct effective disease management. The results suggested that most of tomato varieties were infected with 1 similar to 3 pathogens/endophytic fungi which could be classified into four types including the tomato powdery mildew (Oidium neolycopersici and other uncertain Erysiphaceae species), tomato leaf mould pathogen (Cladosporium fulvum and Passalora fulva), tomato leaf spot pathogen (Botrytis fabae) and uncultured fungus species. The tomato powdery mildew could accrete with the leaf mould pathogen and Sclerotinia sclerotiorum. All detected fungus species showed that the characteristics of pathogens and endophytic fungus species having potential inhibitive pathogens had not been detected in this study. Based on the disease tolerance analysis, our results indicated that Nice Def and Max Thailang are considered to be the perfect tomato variety for cosmically planting and popularization. This work provides an efficient way of being able to detect infected pathogens, even in the early stage of infection of plants.

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