GENETICS OF DROUGHT AND TOMATO YELLOW LEAF CURL VIRUS TOLERANCE IN TOMATO (Solanum lycopersicum L.)
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Date
2015-08
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K.R.C. COLLEGE OF HORTICULTURE, ARABHAVI (UNIVERSITY OF HORTICULTURAL SCIENCES, BAGALKOT)
Abstract
The present research work on Genetics of drought and Tomato Leaf Curl Virus tolerance in tomato (Solanum lycopersicum L.) was conducted using 100 tomato genotypes from different sources. These genotypes were evaluated for performance against TyLCV in Rabi of 2011. The evaluation for drought tolerance was carried out during Summer 2012. Observations on different morphological, growth, disease index, biochemical and yield parameters were recorded. Genotypes varied significantly for all the traits. The result of GCV and PCV indicated that the variation was mostly due to the genetic makeup of the genotypes and the effect of environment was found to be low. The genotypes were grouped in to eight, seven and ten cluster respectively for TyLCV, normal irrigation and restricted irrigation, using Mahalanobis's D2 statistics.
Eight parents were selected from the above two evaluation trials based on their per se performances and crossed in diallel fashion (without reciprocals) to develop 28 hybrids. These hybrids were further evaluated along with their parents separately for TyLCV and drought resistance. For drought tolerance, evaluation was done during Summer 2013 and for TyLCV tolerance it was done during Rabi 2013.
It is evidenced from the study that both additive and non additive gene effects are involved in the genetic control of the traits. So, both gene effects must be considered while developing superior lines tolerant to drought and TyLCV. Estimates of heterosis justified the previous results indicating heterosis breeding to be good tool for crop improvement in tomato.
Four hybrids having combined resistance to drought and TyLCV were selected from hybrid evaluation trial. This study proved the possibility of introgression of multiple resistances in tomato. The present work is basic work to combine biotic and abiotic stress tolerance in tomato.
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TH542
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