Heterosis, combining ability and gene action studies in tomato (Solanum lycopersicum L.)
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Date
2014
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YSPU
Abstract
The present studies entitled “Heterosis, combining ability and gene action studies in tomato (Solanum
lycopersicum L.)” were carried out at the Experimental Research Farm of the Department of Vegetable Science, Dr YS Parmar University of Horticulture and Forestry, Nauni, Solan, Himachal Pradesh during the years 2012 and 2013. The experimental material for the present study comprised of six parents and F1 population of fifteen crosses, developed by crossing these six diverse tomato lines in diallel design (excluding reciprocals). All the parents and their hybrids along with the standard check (Naveen) were planted in a Randomized Complete Block Design for their evaluation in Kharif, 2013. The observations were recorded on days to first flowering, days to marketable maturity, average fruit weight (g), number of fruits per plant, harvest duration (days), fruit yield (kg/plant, kg/plot and q/ha), plant height (cm), number of locules per fruit, pericarp thickness (mm), whole fruit firmness (g/0.503cm2), total soluble solids (oBrix), ascorbic acid content (mg/100g), lycopene content (mg/100g), buckeye rot incidence (%) and Alternaria blight severity (%). The analysis of variance indicated highly significant differences among the genotypes for all the traits studied. Experimental results revealed that three lines viz., Solan Lalima, UHFT-9 and UHFT-10 were found superior on the basis of mean performance and general combining ability studies. Five cross combinations viz., UHFT-9 x Solan Lalima, UHFT-10 x Solan Lalima, UHFT-55 x Solan Lalima, UHFT-22 x Solan Lalima and UHFT-9 x UHFT-10 were found best on the basis of mean performance, specific combining ability and heterosis studies. Hence, these hybrid combinations can be tested further at multiplications before releasing as a substitute of already existing hybrid varieties of tomato in Himachal Pradesh and in India as well. Gene action studies indicated predominance of dominance effects in governing most of the traits suggesting exploitation of hybrid vigour and developing hybrids for improvement of these traits in tomato on the basis of present studies.
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Keywords
crossing over, vegetables, heterosis, fruits, biological phenomena, yields, diseases, planting, hybrids, developmental stages