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VCRB :: Contents of Volume 60/2004 :: Detailed information


RELATIONSHIP BETWEEN YIELD AND PLANT TRAITS OF TOMATO GENOTYPES UNDER DRY LAND CONDITION 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 determine the nature and extent of relationship between fruit yield and plant characteristics at Melkassa Agricultural Research Center (Central Ethiopia). Genotypic correlation was found to be higher in magnitude than that of phenotypic correlation for majority of the characters. This suggested that genetic factors played a major role in respect of relationship between the majority of the characters. Average fruit yield per plant was low and showed positive genotypic correlations with stem diameter, number of nodes on main stem, number of flowers per cluster, number of fruits per plant, fruit length and shape index. However, there were high and negative genotypic correlations of average fruit yield per plant with days to flowering (rg = -0.576), number of fruit clusters per plant (rg = -0.469) and number of seeds per fruit (rg = -0.489). This suggested high inverse relationship between these characters and average fruit yield per plant, which need to be considered accordingly in yield improvement aspects.
At genotypic level, characters like number of nodes on main stem, number of fruits per plant, fruit length and stem diameter exerted positive direct effects and exhibited positive relation with average fruit yield per plant suggesting their possible utilization to improve average fruit yield per plant. The association of number of flowers per cluster and shape index with average fruit yield per plant were also positive but they exerted negative direct effects which implied the role of their indirect positive effects for the improvement of average fruit yield per plant. However, fruit diameter exhibited negative genotypic association but exerted positive direct effects on average fruit yield per plant. This suggested the contrasting role of negative indirect effects of this character to improve average fruit yield per plant. It is thus evident that these negative indirect effects need to be nullified to utilize its positive direct effect. Further, characters such as plant height, days to flowering, days to maturity, number of fruit clusters per plant and number of seeds per fruit exhibited negative direct effects and negative genotypic associations with average fruit yield per plant. This in turn signified the conflicting roles of both direct and indirect effects of these characters toward improving average fruit yield per plant. Hence, they need to be considered accordingly in selection process for improving average fruit yield per plant.


keywords:tomato genotypes, fruit yield, plant characters relationship, correlation path coefficient, analysis

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