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PRELIMINARY CHARACTERIZATION AND EVALUATION OF EXOTIC LINES OF TOMATO (Solanum lycopersicum L.)

KrishiKosh

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Title PRELIMINARY CHARACTERIZATION AND EVALUATION OF EXOTIC LINES OF TOMATO (Solanum lycopersicum L.)
 
Creator Mr. B. RAJASEKHAR REDDY
 
Contributor Dr.HAMEEDUNNISA BEGUM
 
Subject Mahalanobis,potent factors ,coefficient of variation ,GCV
 
Description A set of 56 exotic collections of tomato (Solanum lycopersicum L.) along with 3 checks viz., Arka Vikas, Marutham and Punjab Chhauhara were evaluated in an augmented block design with eight blocks at National Bureau of Plant Genetic Resources Regional Station, Hyderabad during rabi, 2011-12 for the purpose of studying genetic diversity, variability, heritability, genetic advance and character association for eighteen quantitative traits pertaining to growth, earliness, yield and quality.
The analysis of variance revealed significant difference for all the eighteen quantitative and fruit quality attributes. On the basis of the mean performance the genotypes EC677102, EC677047, EC671596, EC676783 were superior for earliness, EC676789, EC676799, EC676725, EC677076 and EC677072 were superior for fruit yield and the genotypes EC677076, EC676791, EC677130, EC581017 and EC581018 were superior for quality, which can be utilized in various breeding programmes for the development of either pureline variety or F1 hybrids.
Multivariate analysis following Mahalanobis D2 statistics revealed distinct clustering pattern and considerable genetic diversity within and between clusters and were grouped into seven clusters. The characters fruit weight, number of fruits per plant and plant height were found to be the potent factors in differentiating the genotypes under study.

From the coefficient of variation it is evident that the estimates of PCV were higher than the corresponding GCV for all the eighteen quantitative attributes indicating the greater influence of environment on the expression of these genotypes. The estimates of genotypic and phenotypic coefficient of variation were high for plant height, number of primary branches per plant, number of flowers per cluster, number of fruits per cluster, fruit length, fruit weight, fruit yield and ascorbic acid indicating the existence of high degree in the material under study offering ample scope for selection.
The attributes plant height,number of primary branches per plant, number of flowers per cluster, number of fruits per cluster, fruit length, fruit weight and acidity had high heritability (>60%) accompanied with high genetic advance over percent mean (>20%) indicating that most likely the heritability is due to additive gene action and the chances of fixing by selection is easy to improve these traits.
Simple correlation coefficient analysis revealed significantly positive association of plant height, number of primary branches per plant, number of flowers per cluster, fruit length and width with fruit yield, while no association of ascorbic acid, acidity and TSS with shelf life.
Of the five quantitative traits which had positively significant association with fruit yield only number of primary branches per plant and number of flowers per cluster had positively high direct effect indicating that direct selection for these characters will be effective. For plant height, fruit length and fruit width whose direct effect is negligible to low but had significantly positive correlation with fruit yield, indirect selection will be effective.
On the whole, there was magnificient diversity and variability for all the eighteen characters under study. The characters plant height, number of primary branches per plant, number of flowers per cluster, fruit length and fruit width were identified as yield components in tomato. Considering these components as selection indices, the genotypes EC676789 and EC676799 were horticulturally superior with respect to indeterminate growth and fruit yield and the genotypes EC677076 and EC676725 were determinate, horticulturally superior for both fruit yield and fruit quality attributes.
 
Date 2016-07-23T09:44:48Z
2016-07-23T09:44:48Z
2012-06
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/69465
 
Language en
 
Format application/pdf
 
Publisher Dr Y. S. R. HORTICULTURAL UNIVERSITY