Determination of genetic variation for morphological and yield traits in bell pepper

SONIA SOOD, NAVEEN KUMAR, K S CHANDEL, PARVEEN SHARMA

Abstract


An experiment was conducted during 2008–09 to generate genetic information on yield and yield-contributing growth, fruit yield and related traits in bell pepper (Capsicum annuum L. var. grossum Sendt.). The study was undertaken to assess genetic variation for yield, days to first picking, days to harvest, fruits/plant, fruit length, fruit girth, pericarp thickness, average fruit weight and lobes/fruit, and to quantify the relationship among these traits. Significant differences were observed for all the traits among 19 diverse genotypes except days to first picking and lobes/fruit, revealed presence of sufficient variability for these traits, which was confirmed by broad range of variability. Little or no difference between genotypic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV) in all the traits indicated that these were less influenced by environment. The phenotypic coefficient of variation (PCV) exhibited higher values than genotypic coefficient of variation (GCV) for all the traits, indicating close association between phenotype and genotype. High estimates of PCV for fruit yield and fruits/plant indicated the importance of additive genes. High heritability coupled with high to moderate genetic advance was observed for fruit yield/plant, fruits/plant, fruit length, fruit girth, pericarp thickness and average fruit weight indicating role of additive gene action for its inheritance and could be improved through selection. Days to harvest had low heritability estimates along with low genetic advance, indicating non-additive gene activity and this could be improved through hybridization. In general, genotypic correlations were higher than the corresponding phenotypic correlations, revealing inherent association among traits. Character association analysis revealed that fruit yield/plant was strongly correlated with fruits/plant, which could be considered as one of the important selection criteria in the improvement of fruit yield. The lines DPC 4, DPC 6, DPC 7 and DPC 3 revealed the highest yield along with desirable fruit colour and other agromorphological traits and can be considered as a remunerating off-season crop during summer and rainy seasons in sub-temperate conditions of Himachal Pradesh. Adequate genetic variability was present within available bell pepper germplasm to allow breeding improvement of growth, fruit yield and related traits. The maximum direct effect on fruit yield/plant was exhibited by fruits/plant, followed by average fruit weight and days to harvest. This indicated that a selection procedure based on higher fruits/plant, average fruit weight and longer days to harvest may be effective in improving fruit yield.


Keywords


Bell pepper; Capsicum annuum var. grossum; Correlation; Genetic advance; Genetic variability;Heritability; Path analysis; Yield characters

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Print ISSN: 0019-5022

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