Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/5810127396
Authors: D.TRIVENI
Advisor: Dr. P. SAIDAIAH
Title: STUDIES ON HETEROSIS AND COMBINING ABILITY FOR YIELD AND YIELD CONTRIBUTING TRAITS IN TOMATO (Solanum lycopersicum L.)
Publisher: College of Horticulture, Rajendranagar, HYD-30
Citation: Sri Konda Laxman Telangana State Horticultural University, Rajendranagar, Hyderabad-30
Language: en
Type: Thesis
Pages: 1-179
Agrotags: null
Keywords: HETEROSIS AND COMBINING ABILITY FOR YIELD AND YIELD CONTRIBUTING TRAITS IN TOMATO
Abstract: The present investigation entitled “Studies on heterosis and combining ability for yield and yield contributing traits in tomato (Solanumlycopersicum L.)” was carried out at PG students research farm, College of Horticulture, Rajendranagar, Hyderabad with the aim to develop more heterotic hybrids. The main objectives of the investigation were to estimate the magnitude of heterosis and estimation of gcaand scaeffects of the parents and hybrids, respectively for yield and yield contributing traits. Line x Tester analysis was undertaken with seven lines (EC 620408, EC 620494, EC 654289, EC 620639, EC 631410, EC 631407 and LA 3667) and three testers (Pusa Ruby, ArkaVikas and ArkaMeghali). The resulted 21 hybrids along with parents and three standard checks (ArkaRakshak, US 440 and Punjab Chhuhara) were evaluated during early Summer, 2017 in a Randomized Block Design with three replications to study heterosis and combining ability of twenty yield and yield related traits viz.,plant height (cm), number of primary branches per plant, number of flower clusters per plant, number of flowers per cluster, days to first flowering, days to 50% flowering, days to first harvest, days to last harvest, number of fruits per cluster, number of fruits per plant, number of marketable fruits per plant, fruit length (cm), fruit width (cm), fruit weight (gm), fruit yield per plant (kg), yield per hectare (tons), TSS (°Brix), pH, ascorbic acid (mg/100g) and lycopene (mg/100g). Analysis of variance revealed that replication mean sum of squares due to parents and hybrids were non- significant for all the traits studied, so there is no environmental error in controlling these characters. Treatment mean sum of squares due to parents and hybrids were highly significant for all the traits, indicating that there is lot of variation between the characters studied. Further, the Line x Tester effect was found significant for all the characters under the study except for days to first flowering and days to last harvest. The mean performances of the two crosses EC 620494 x ArkaVikas (3.13kg) and EC 620494 x Pusa Ruby (3.10kg) for fruit yield per plant were superior over the standard checks US 440 (2.84kg) and ArkaRakshak (2.78kg). The ratios of GCA/SCA variances revealed that non- additive gene action was predominant in the heritance of all the characters. Hence, heterosis breeding is ideal to improve these traits. The gca effects of the parents revealed that the three lines viz., EC 620494, EC 631410 and LA 3667 and one testerPusa Ruby were found to be promising general combiners for yield per plant and most of other traits. Hence, these inbreds are to be utilized for potential application in crop improvement programmes. Based on significant scaeffects, six hybrids viz., EC 620408 X ArkaMeghali, EC 620494 x ArkaVikas, EC 654289 x Pusa Ruby, EC 631407 x Pusa Ruby, EC 620494 x Pusa Ruby and LA 3667 x ArkaVikas were identified as promising for yield per plant and other yield contributing traits. Significant and higher standard heterosis over better check US 440 for fruit yield per plant was recorded in EC 620494 x ArkaVikas (10.46%). Over ArkaRakshak two hybrids, EC 620494 x ArkaVikas (12.71%) and EC 620494 x Pusa Ruby (11.39%) showed high and significant standard heterosis. Significant and higher standard heterosis over Punjab Chhuhara was observed in ten crosses. Based on the present study, it can be emphasized that two cross combinations EC 620494 x Pusa Ruby and EC 620494 x ArkaVikas have been identified as promising based on per se performance, sca effects and heterosis for yield per plant and other important attributes. Hence, these hybrids may be released for commercial cultivation after extensive multilocational trails.
Description: Based on the present study, it can be emphasized that two cross combinations EC 620494 x Pusa Ruby and EC 620494 x ArkaVikas have been identified as promising based on per se performance, sca effects and heterosis for yield per plant and other important attributes. Hence, these hybrids may be released for commercial cultivation after extensive multilocational trails.
Subject: Vegetable Science
Theme: Significant and higher standard heterosis over better check US 440 for fruit yield per plant was recorded in EC 620494 x ArkaVikas (10.46%). Over ArkaRakshak two hybrids, EC 620494 x ArkaVikas (12.71%) and EC 620494 x Pusa Ruby (11.39%) showed high and significant standard heterosis. Significant and higher standard heterosis over Punjab Chhuhara was observed in ten crosses. Based on the present study, it can be emphasized that two cross combinations EC 620494 x Pusa Ruby and EC 620494 x ArkaVikas have been identified as promising based on per se performance, sca effects and heterosis for yield per plant and other important attributes. Hence, these hybrids may be released for commercial cultivation after extensive multilocational trails.
Research Problem: HETEROSIS AND COMBINING ABILITY FOR YIELD AND YIELD CONTRIBUTING TRAITS IN TOMATO
These Type: M.Sc
Issue Date: 2017-07-20
Appears in Collections:Thesis

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