Abstract
The present study was conducted following randomized complete block design with three replications to evaluate the genetic variability of twenty five tomato genotypes for yield and nutritional traits and also their attributing factors. A wide range of variation was observed among the characters studied which have a great interest for tomato breeders. Heritability in broad and narrow sense for soluble solid in green and red tomato, total phenolic content, fruit diameter and seed/fruit was 93.23%, 98.58%, 99.92%, 99.37% and 96.15% respectively and for those traits, phenotypic influence was negligible. Leaf chlorophyll content and total phenolic content showed positive significant correlation with soluble solid (sugar) whereas pH showed negative correlation. Yield/plant was found highly significant and positively correlated with individual fruit weight, fruit diameter, seed/fruit, and plant height whereas soluble solid, leaf chlorophyll content, total phenolic content showed negative correlation. Path analysis revealed that soluble solid had positive direct effect with leaf chlorophyll content, pH of fruit juice and days to first flowering and negative direct effects with individual fruit weight, fruit diameter, plant height, fruit /bunch, whereas yield/plant showed positive direct effects with all above traits except soluble solids in red tomato, which clearly indicate inverse correlation between yield and nutritional components of tomato fruit. Further, principal component analysis found that four principal components contributed 75.1% of the total variability. Individual fruit weight, days to first flowering, pH of fruit juice, fruit/bunch and soluble solids in fruits were found to be the most important traits in PC1, PC2, PC3, PC4 and PC5, respectively. As soluble solid content, yield and its component traits have high heritability, therefore, improvement is also possible using breeding approaches.
 J. Bangladesh Agril. Univ. 17(2): 187–193, June 2019
Highlights
Introduction farmers for its high market value and as well as Tomato (Lycopersicon esculentum L.) is one of the most researcher for its genetics and genomic characters
High heritability for plant height on 1st leaf appearance, soluble solid in green and red tomato, total phenolic content, fruit diameter and weight, and seed/fruit indicated less influence of environments that could be exploited through simple selection from this material to improve yield as suggested by Mohanty, (2003)
Low to medium heritability for plant height, leaf chlorophyll content, and pH in red tomato suggested a careful selection from the material for enhancing the genetic portion of variation that can be attained through addition of superior germplasm (Johnson et al, 1955)
Summary
Introduction farmers for its high market value and as well as Tomato (Lycopersicon esculentum L.) is one of the most researcher for its genetics and genomic characters. Tomato fruit yield is the final result (BBS, 2008). It is cultivated all over the country due to which is associated with other yield contributing traits its adaptability to wide range of soil and climate and theses traits again interrelated among them (Islam (Ahmed, 1976). To meet up local esculentum Mill.) is affected by fruit appearance, flavor demand, Bangladesh government imported 10935 metric (taste and aroma) (Shewfelt, 1993) and texture (Causse tonnes from foreign countries in the same time (BBS, et al, 2001; Vickers, 1977). Considering the fact, the present study was undertaken to determine the genetic association between different morphological and nutritional traits for further development and selection of superior nutritional rich high yielding tomato genotypes
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