Evaluation of Reaction of Some Cultivars and Genotypes of Tomato to Early Blight Disease
Subject Areas : Journal of Crop Ecophysiology
R.
Hajianfar
1
(Staff member of Seed and Plant Improvement Institute, Karaj, Iran)
A.
Zarbakhsh
2
(Assistant Prof., Seed and Plant Improvement Institute, Karaj, Iran)
Keywords: Genotypes, AUDPC, Alternaria tenuissima, Early blight disease, Resistance and Tomato,
Abstract :
The reaction of 21 tomato varieties and genotypes to alternaria blight were evaluated in greenhouse and field conditions. Genotypes and varieties were inoculated with of this pathogen artificially in both experiments. After inoculation, disease characteristics such as disease index, area under disease progress curve (AUDPC), percent of dried flower and yield in the field and disease index, percent of infected leaves and surfaces of blight on leaves in greenhouse were recorded. Results of greenhouse experiment showed that varieties and genotypes including Super 2270 King stone, Kallgi and 8403 had the least infection to disease. On the other hand, Imperial variety and 8406 genotype exhibited the highest amount of infection. Varieties in the field experiment, including Super 2270, King stone, Early urbano VF, and 8402 genotype, showed the least infection and genotypes like 8405, 8406, 8407 and Peto early ch variety had the highest amount of infection. In both experiments Super 2270, King stone and Early urbano VF varieties were found resistant to be this pathogen, but 8402 genotype was resistant only in the field and 8403 genotype and Kallgi variety were resistant only under greenhouse condition. Soria variety showed a considerable disease spot in both experiment but could produce the highest means of yield about 91.64 ton/ha. in the field, compared to other varieties and genotypes. Hence it is assumed to be the tolerant variety.
