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VCRB :: Contents of Volume 58/2003 :: Detailed information


STUDY ON VARIABILITY IN TOMATO GERMPLASM UNDER CONDITIONS 
OF CENTERAL ETHIOPIA


Fekadu MARIAME1, Hutchappa RAVISHANKAR2, Lemma DESSALEGNE1
1Ethiopian Agricultural Research Organization, Melkassa Agricultural Research Center P.O. Box 2500, Nazret, Ethiopia 2Alemaya University, P.O. Box 138, Dire-Dawa, Ethiopia


Summary

Twenty one fresh market tomato genotypes were evaluated to estimate the nature and magnitude of variability in fruit yield and yield components at Melkassa Agricultural Research Center (Central Ethiopia), during August, 2000 - March, 2001. Significant genotypic variability among the test genotypes was observed for all the characters studied. In general, phenotypic coefficient of variation (PCV) was higher than that of genotypic coefficient of variation (GCV). Heritability estimates were high in respect of all the characters under consideration. The highest value of expected genetic advance as per cent of mean was recorded in respect of plant height followed by marketable fruit yield per plot, number of fruits per plant, number of flowers per cluster, number of seeds per fruit and number of fruit clusters per plant. High heritability estimates coupled with high genetic advance as percent of mean were recorded for plant height, number of nodes on main stem, number of flowers per cluster, number of fruits per plant and number of seeds per fruit. The results suggested the existence of high genetic variability among the test for all the characters studied. This paper highlights the evaluation of genetic variability among different characters as an approach to improvement of average fruit yield per plant in tomato.


keywords:tomato genotypes, genetic advance, variability, yield, heritability

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