STUDIES ON HETEROSIS AND COMBINING ABILITY FOR GROWTH, YIELD AND QUALITY TRAITS IN TOMATO (SOLANUM LYCOPERSICUM L.) UNDER PROTECTED CONDITION
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Date
2018
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Indira Gandhi Krishi Vishwavidhyalaya, Raipur
Abstract
The present studies entitled “Studies on heterosis and combining ability for growth, yield and quality traits in Tomato (Solanum lycopersicum L.) under protected condition” were carried out under naturally ventilated polytunnel at Centre of Excellence on Protected Cultivation and Precision Farming, Department of Vegetable Science, College of Agriculture, Indira Gandhi Krishi Vishwavidyalaya, Raipur, Chhattisgarh during the years 2017 and 2018. 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 (Yuvraj) were planted in a Randomized Complete Block Design for their evaluation.
The observations were recorded on days to first flowering (days), days to 50 per cent flowering (days), days to marketable maturity (days), number of flowers per cluster, number of fruits per cluster, per cent fruit set, fruit length (cm), fruit diameter (cm), average fruit weight (g), number of fruits per plant, yield per plant (kg), duration of crop, stem girth (cm), plant height (cm), number of locules per fruit, pericarp thickness (mm), T.S.S., and ascorbic acid content (mg/100g). The analysis of variance indicated highly significant differences among the genotypes for all the traits studied. On the basis of heterosis (better parent) experimental results revealed that cross combination TOINDVAR-1 x TOINDVAR-5 for earliness, TOINDVAR-1 x TOINDVAR-4 for fruit weight, TOINDVAR-2 x TOINDVAR-4 for yield per plant, TOINDVAR-3 × TOINDVAR-4 for pericarp thickness, TOINDVAR-1 x TOINDVAR-3 for T.S.S., for ascorbic acid content, exhibited highest heterosis over better parent in desirable direction. Highest mid parent and standard heterosis for yield per plant, was recorded by cross TOINDVAR-3 x TOINDVAR-6. With respect to gca TOINDVAR-2 was best combiner for earliness and yield per plant, TOINDVAR-1 for fruit weight, TOINDVAR-6 best combiner for number of flowers per cluster, number of fruits per cluster, per cent fruit set. TOINDVAR-4 best combiner for fruit length, plant height, and stem girth and pericarp thickness, TOINDVAR-3 best combiner for number of fruits per plant and TOINDVAR-5 was best combiner for total soluble solids and ascorbic acid content. Highest sca effect in desirable direction was exhibited by cross TOINDVAR-1 x TOINDVAR-5 for earliness, TOINDVAR-2 X TOINDVAR-6 for number of flowers per cluster, TOINDVAR-2 x TOINDVAR-5 for number of fruits per cluster, TOINDVAR-2 x TOINDVAR-4 for per cent fruit set, days to marketable maturity, fruit length, number of fruits per plant and yield per plant, TOINDVAR-1 x TOINDVAR-6 for fruit diameter, TOINDVAR-1 x TOINDVAR-3 for fruit weight, TOINDVAR-1 x TOINDVAR-2 for pericarp thickness, TOINDVAR-3 x TOINDVAR-5 for total soluble solids and TOINDVAR-3 x TOINDVAR-6 for ascorbic acid content. Gene action studies indicated predominance of dominance effects in governing most of the traits suggesting exploitation of hybrid vigor and developing hybrids for improvement of these traits in tomato on the basis of present studies.
Description
STUDIES ON HETEROSIS AND COMBINING ABILITY FOR GROWTH, YIELD AND QUALITY TRAITS IN TOMATO (SOLANUM LYCOPERSICUM L.) UNDER PROTECTED CONDITION
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