Studies on genetic components of variation and characters association in tomato (Solanum lycopersicum L.).
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Date
2022
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Department of Horticulture, Institute of Agricultural Sciences Banaras Hindu University, Varanasi
Abstract
In the present investigation, an experiment has been doneon germplasmevolution in 15 genotypes of tomato (Solanumlycopersicum L.) at Vegetable Research Farm of Department of Horticulture, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi-221005, during Rabi season of 2020-21.The experiment was laid under Randomized Block Design with three replications to investigate the genetic variability, heritability, genetic advance, genetic advance as percentage of mean, correlation coefficient, path analysis and genetic diversity.Analysis of coefficient of variation revealed that magnitude of phenotypic coefficient of variation was higher than genotypic coefficient of variation for all the characters under study. The high phenotypic and genotypic coefficient of variations (PCV and GCV) were noted for lycopene content (49.27 and 48.58) followed by dry fruit weight (32.94 and 31.54) and locules per fruit (29.92 and 27.40). High heritability and genetic advance were observed for lycopene (98.67%) and fruit weight (15.49) while moderate heritability was recorded for seed test weight (44.32%).Fruit yield per plant showed significant positive correlation with lycopene, fruit per plant, ascorbic acid and days to fifty percent flowering. The path coefficient studies also revealed that a high positive direct effect was recorded through lycopene, fruit per plant, locules per fruit, ascorbic acid and pericarp thickness towards yield indicating that these characteristics may be considered the most reliable selection indices while makingselection for high yielding genotypes. Fruit yield per plant contributed much more to genetic diversity followed by lycopene content, seed test weight, ascorbic acid and fruit weight. The exploration of genetic variability in the available germplasm is a prerequisite in breeding programme for effective selection of superior genotypes of tomato.
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Tomato