Genotypes x environment interaction studies on early blight disease of tomato
Indian Institute of Vegetable Research, Post Box No. 01, P.O. Jakhini (Shahanshahpur), Varanasi-221305, Department of Botany, Udai Pratap Autonomous P.G. College, Varanasi-221002, Department of Mycology & Plant Pathology, Institute of Agricultural Science
DOI: https://doi.org/10.37855/jah.2013.v15i03.41
Key words: Tomato, Solanum lycopersicum, early blight, Alternaria solani, percent disease incidence (PDI), area under disease progress curve (AUDPC)
Abstract: Experiments were conducted for three years to study the interaction between tomato genotypes and environment against early blight disease caused by Alternaria solani. Fifty one genetically diverse genotypes of tomato were screened in field conditions against early blight in Rabi season of 2006-09 at Indian Institute of Vegetable Research, Varanasi, India. Results revealed that genotype LA-3980 was resistant while, EC-520058, EC-520060, EC-520061, EC-520070, EC-521080, WIR-3928 and H-88-78-1 were highly resistant. All the resistant and highly resistant lines belong to wild species except H-88-78-1 and LA-3980. Only three genotypes, EC-520061, EC-520070 and H-88-78-1 were stable in each environment for resistance to early blight disease in tomato. Relationship of environment with resistant genotypes indicated that EC-520061, EC-520070, WIR-3928 and H-88-78-1 had low regression coefficient (b<1) and low deviation from regression (sd2=<1) than others (b= >1and sd2=>1) indicating stable and adaptive genotypic resistance to early blight. Hence these genotypes may be used as donor parent for development of early blight resistant/ tolerant varieties / lines.
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