Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/5810128773
Authors: B. Mounika
Advisor: Dr. Ch. RAJA GOUD
Title: GENETIC DIVERGENCE AND SCREENING TOMATO (Solanum lycopersicum L.) GERMPLASM FOR YIELD, QUALITY AND RESISTANCE AGAINST ROOT-KNOT NEMATODE (Meloidogyne incognita)
Publisher: College of Horticulture, Rajendranagar, HYD-30
Citation: Sri Konda Laxman Telangana State Horticultural University, Rajendranagar, Hyderabad-30
Language: en
Type: Thesis
Pages: 1-158
Agrotags: null
Keywords: GENETIC DIVERGENCE, SCREENING TOMATO, YIELD, QUALITY AND RESISTANCE AGAINST ROOT-KNOT NEMATODE
Abstract: The present investigation entitled “Genetic divergence and screening tomato (Solanum lycopersicum L.) germplasm for yield, quality and resistance against root-knot nematode (Meloidogyne incognita)” was undertaken to estimate the genetic divergence, yield component analysis through correlation and path analysis and screening against root-knot nematode (Meloidogyne incognita). Thirty one genotypes were evaluated in a Randomized Block Design with three replications during rabi, 2017-2018 at College of Horticulture, Rajendranagar, Hyderabad. The analysis of variance (ANOVA) of RBD revealed highly significant differences among the genotypes for all the fourteen characters. Wide range of variability was observed for average fruit weight (4305.12) followed by plant height (2772.80) and number of fruits per plant (1024.360) indicating the scope for selection of initial breeding material for further improvement. The result of mean performance of thirty one genotypes for fourteen characters revealed that the genotype EC-620378 was the superior for yield and yield contributing characters i.e. fruit yield per plant (2.44 kg) and yield per plot (34.10 kg). The genotype EC-917090 was found to be early as observed from the character days to first flowering (27.00 days) and days to 50% flowering (30.50 days).The genotype EC-163605 was found superior to number of clusters per plant (36.33).The genotype EC-165700 was found superior to days to first fruit set (61.33). The genotype EC-914109 was found superior to days to first fruit harvest (36.33). The genotype EC-249504 was significantly superior for plant height (185.00 cm). The genotype EC-164334 was significantly superior to number of branches (20.8). The genotype EC-917090 was significantly superior for number of fruits per plant (98.66), ascorbic acid (42.56mg/100gm) and lycopene (6.24mg/100g). The accession EC-631364 was found to be superior for TSS (5.62 0Brix). The check variety Laxmi was found to be superior for lycopene content (4.95mg/100gm) followed by Marutham (4.82mg/100gm). Mahalanobis D2 statistical analysis revealed that number of fruits per plant contributed maximum towards divergence followed by ascorbic acid, yield per plot, number of clusters per plant, plant height, lycopene content, average fruit weight and TSS. The D2 analysis for fourteen characters partitioned the thirty one genotypes into six clusters. The inter cluster D2 values of the six clusters revealed that highest inter cluster generalized distance (819.88) was between cluster I and VI, while the lowest (171.10) was between cluster II and cluster III. The clusters showing high genetic divergence could be effectively utilized in heterosis breeding programme. High heritability coupled with high genetic advance as per cent of mean indicates operation of additive gene action this was observed in characters viz., 20 plant height, number of branches per plant, number of clusters per plant, number of fruits per plant, average fruit weight, fruit yield per plant, yield per plot, ascorbic acid content, TSS, and lycopene content. The high genetic variability was observed for the characters viz., plant height, number of branches, number of fruits per plant, average fruit weight, fruit yield per plant, yield per plot and ascorbic acid, which indicates the significance so, that these characters can be used for selecting superior genotypes. From correlation studies, fruit yield per plant exhibited high significant positive association with average fruit weight, number of fruits per plant, fruit yield per plot, lycopene indicating the importance of these traits in selection for yield. Direct selection based on these traits would result in simultaneous improvement of afore said traits and yield per se in tomato. The path coefficient analysis in the study revealed the improvement of yield by improving the characters i.e days to first flower, fruits per plant and average fruit weight. Yield per plant of tomato can also increased indirectly through number of plant height, days to fruit set, number of fruits per plant and average weight of fruit. Thirty one genotypes were screened for their reaction to root-knot nematode (Meloidogyne incognita). None of the genotypes were found resistant. The cultivar Hisar Lalit found moderately resistant. Two genotypes (EC-631364 and EC-620395) were found susceptible while the remaining 28 genotypes were found highly susceptible root-knot nematode. Considering the mean performance, eleven superior genotypes viz., EC- 620378 (2.44kg), EC-917090 (2.01kg), EC-631356 (1.92kg), EC-914109 (1.87kg), EC-62389 (1.85kg), EC-164334 (1.66kg), EC-914099 (1.64kg), EC- 620395 (1.60kg), EC-249514 (1.56kg), EC-914089 (1.46kg), and EC-538156 (1.42kg) were superior for yield per plant which may be released as pureline varieties after testing their stability over locations and years for commercial cultivation. The genotypes with superior quality traits viz., EC-917090 for ascorbic acid (42.56mg/100gm) and lycopene (6.24mg/100g) and EC-631364 for TSS (5.62 0Brix) and can be included in pedigree selections for further improvement.
Description: The analysis of variance (ANOVA) of RBD revealed highly significant differences among the genotypes for all the fourteen characters. Wide range of variability was observed for average fruit weight (4305.12) followed by plant height (2772.80) and number of fruits per plant (1024.360) indicating the scope for selection of initial breeding material for further improvement.
Subject: Vegetable Science
Theme: The analysis of variance (ANOVA) of RBD revealed highly significant differences among the genotypes for all the fourteen characters. Wide range of variability was observed for average fruit weight (4305.12) followed by plant height (2772.80) and number of fruits per plant (1024.360) indicating the scope for selection of initial breeding material for further improvement.
Research Problem: GENETIC DIVERGENCE AND SCREENING TOMATO (Solanum lycopersicum L.) GERMPLASM FOR YIELD, QUALITY AND RESISTANCE AGAINST ROOT-KNOT NEMATODE (Meloidogyne incognita)
These Type: M.Sc
Issue Date: 2018-07-30
Appears in Collections:Thesis

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