Genetic Variability Studies for Yield and Quality Traits in tomato (Solanum lycopersicum L.)

Genetic variability studies in tomato (Solanum lycopersicum L.) under protected cultivation

“…Broad sense heritability of all genotypes have recorded more than 60 percent for 20 traits, indicating a strong genetic determination passed on to the next generation. Similar results were reported by Sunilkumar et al (2013) [17] , Sureshkumara et al (2018) [18] . High estimates of genetic Advance as a percentage of mean (GAM) were recorded in plant growth parameters such as plant height (cm) and number of branches, as well as in yield-attributing traits like number of clusters / plant, fruit polar diameter, number of fruits / cluster and number of fruits / plant.…”

“…The parameters like number of clusters / plant, fruit polar diameter, number of fruits / cluster, number of fruits / plant, height of plant and number of branches after 90 days have shown highest percentage of both heritability & GAM which suggested that the observed variation in the trait is largely influenced by genetic factors and there is potential for effective selection to improve the trait in future generations. Similar reports were obtained by Sunilkumar et al (2013) [17] , Sureshkumara et al (2018) [18] . Whereas days to 1 st flowering, days to 50% flowering and days to first harvest (counts) have scored less percentage of both that indicated they are largely influenced by environmental factors.…”

“…Therefore, selection for these characters in genotypes based on phenotypic performance would likely be effectively more. Similar outputs were obtained by Namita et al (2021), (Sunilkumar et al, 2013) [17] , Sureshkumara et al (2018) [18] . The parameters like number of clusters / plant, fruit polar diameter, number of fruits / cluster, number of fruits / plant, height of plant and number of branches after 90 days have shown highest percentage of both heritability & GAM which suggested that the observed variation in the trait is largely influenced by genetic factors and there is potential for effective selection to improve the trait in future generations.…”

“…Differences observed between the coefficients of genetic and phenotypic variation (GCV and PCV) have shown lesser magnitude for all the characters studied. Identical results have also obtained by Sureshkumara et al, (2018) [18] , Lekshmi and Celine (2017) [6] . Highest level of GCV and PCV were recorded in fruit polar diameter, number of clusters / plant, number of fruits / cluster, number of branches, plant height, number of fruits / plant fruit firmness, fruit yield / hectare, fruit yield / m 2 , fruit yield per plant (kg) and number of locules (n).…”

Variability analysis in tomato (Solanum lycopersicum L.) crosses under drought stress

“…Characteristics such as plant height, root length and lycopene for the cross EC169966 × LE118, root length, nitrate reductase, chlorophyll stability index, titratable acidity and lycopene for the cross EC177824 × LE27 and fruit length, fruit diameter and chlorophyll stability index for the cross Arka Ashish × LE27 were also recorded with high heritability combined with high GAM, reporting that the heritability was due to additive gene effects. Thus, selection for these traits might be effective (Sureshkumara et al, 2018;Shiksha and Sharma, 2018). Fruit traits such as fruit length, fruit diameter, and biochemical traits, viz., total soluble solids, chlorophyll stability index, nitrate reductase activity, catalase activity and acidity for EC 169966 × LE 118, and characteristics such as plant height, fruit length, fruit diameter and catalase for EC 177824 × LE 27, plant height, days to first flowering, nitrate reductase, catalase, titratable acidity and lycopene for Arka Ashish × LE 27 were reported to have high heritability and moderate GAM, indicating that these effects are due to additive gene action governing the traits (Buhroy, 2017;Mamatha et al, 2017).…”