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Authors: Ravindra Kumar
Advisor: Prof. R. K. Singh
Publisher: Institute of Agricultural Sciences, Banaras Hindu University
Language: en
Type: Thesis
Series/Report no.: P0106;
Agrotags: Tomato, combining ability, heterosis, inbreeding depression, gene action, stability, tolerance, Alternaria blight, yield and quality traits
Abstract: The present investigation entitled “Heterosis & Combining Ability studies for Yield and Quality Traits in Tomato (Lycopersicon esculentum Mill.)” was conducted during three Kharif and two Rabi seasons 2010, 2011 and 2012 at Vegetable Research Farm, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi (India).The experimental material for the investigation comprised of 10 lines (H-24 DT-2, CO-3, Punjab Upma, Pant T-3, H-86, Selection-7, NDTVR-60, Fla-7171 and Kashi Amrit) used as female and three genotypes testers as male (Floradade, Kashi Sharad and Azad T-5), F1’s were obtained by crossing the parents in a “line x tester” mating design and the F1’s were grown with two checks BT-12 and Shaktiman (promising hybrid variety in Uttar Pradesh) in randomized block design with three replication in subsequent seasons. Crosses showing best heterotic combination for yield and its attributing traits which may be exploiting for developing hybrid tomato varieties are (CO-3×Floradade), (Pant T-3×Azad T-5), (Punjab Upma×Azad T-5), (Pant T-3×Kashi Sharad) and (Kashi Amrit×Kashi Sharad). The characters viz; plant height, days to 50% flowering, number of primary branches, fruits per plant, fruits per cluster and ascorbic lycopene showing non-significant inbreeding depression are expected to be primarily governed by additive gene action. The high inbreeding depression indicated presence of certain amount of non additive gene action in different crosses for average, fruits weight, fruit shape index and yield per plant. The lines H-24, CO-3, Pant T-3 and testers Kashi Sharad, Azad T-5 prove to be the good general combiners for most of the traits. The crosses (CO-3×Floradade) and (Punjab Upma×Azad T-5) were found best specific combiners for total yield per plant. 5. The generation mean analysis for most of the characters showed the importance of both additive and dominant types of gene effects. However, dominance genes effect in general was higher than additive gene effects in most of the cases. Thus development of hybrids for commercial is effective. Additive genetic variance was found maximum for plant height, primary branches per plant, fruit per cluster, total soluble solid and titrable acidity in different crosses, thus selection can be very effective for these traits. Higher GCV and PVC were recorded for most of the characters indicating higher magnitude of variability for these characters. The highest heritability was recorded on pericarp thickness (97%), while the lowest was for primary branches per plant (56%). The correlation of yield with most of the traits indicated that simultaneous improvement of yield through indirect selection of highly correlated yield attributes such as number of fruits per plant, number of primary branches and plant height. In 2010, two crosses showed resistance, nine crosses showed moderate resistance, eighteen crosses showed susceptible while only one cross were highly susceptible. During 2011, one cross showed resistance, eleven crosses showed moderate resistant and eighteen crosses were susceptible with early blight. It can be conclude that cross Fla-7171 × Floradade was resistant in both the seasons. The cross combination, H-24 × Floradade was stable for average fruit weight. In totally, nineteen, one and one stable genotypes were identified for the traits fruit shape index, total yield per plant and TSS, respectively. Among the top ten high yielding hybrid cross combinations, one (Pant T-3×Azad T-5) stable and eight crosses (H-24×Kashi Sharad, CO-3× Floradade, CO-3×Kashi Sharad, CO-3×Azad T-5, Punjab Upma × Azad T-5, Pant T-3×Kashi Sharad, Kashi Amrit×Kashi Sharad and H-24×Azad T-5) were found to be responsive enough to be recommended for wide cultivation in all the four seasons studies.
Description: Ph. D.
Issue Date: 2015
Appears in Collections:Thesis

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