The study focused on evaluating 48 different tomato genotypes for 13 morphological traits to estimate the genetic variability, heritability and genetic advance at the Horticulture Research Centre of Sardar Vallabhbhai Patel University of Agriculture and Technology in Meerut, following randomized complete block design with three replications during two consecutive Rabi seasons (October 2022 and April 2024). The results of analysis of variance revealed that for all quantitative features included for both the season, analysis of variance indicated highly significant variations among genotypes. The phenotypic and genotypic coefficient of variation ranged from 4.92% to 16.42% and 4.23%to12.93% respectively. Higher PCV compared to GCV observed for all traits revealed that the influence of environment on traits. High heritability estimates obtained for day to first fruit set, days to first fruit maturity, plant height, days to first fruit harvesting, days taken germination, number of fruits per plant, fruit yield(t/ha), fruit length, fruit yield (kg/plant), fruit yield (kg/plot), High Genetic Advance for number of primary branch, plant height, fruit length, days to first fruit set. High heritability coupled with High Genetic Advance Observed for day to first fruit set, plant height, days to first fruit set, fruit length. As yield is the most important dependent trait, day to first fruit set, plant height, days to first fruit set, fruit length can be selected as selection parameters for further crop improvement programs.
The present study was conducted using different chickpea genotypes during the Rabi 2022–23 season at the Field Experimentation Centre, Department of Genetics and Plant Breeding, Naini Agricultural Institute, Sam Higginbottom University of Agriculture, Technology and Sciences, Uttar Pradesh. The experiment was laid out in a randomised block design with three replications to estimate genetic variability parameters and conduct correlation and path analyses for thirteen quantitative traits. Analysis of variance indicated highly significant differences among the genotypes at the 1% probability level for all traits. Phenotypic coefficients of variation (PCV) were higher than genotypic coefficients of variation (GCV) for all traits, indicating environmental influence. Most traits exhibited high heritability, except days to 50% flowering. High heritability coupled with high genetic advance as a percentage of the mean was observed for the number of primary branches, number of secondary branches, number of pods per plant, pod length, number of seeds per pod, biological yield per plant, seed index and harvest index. Correlation and path coefficient analyses indicated that plant height, days to maturity, number of seeds per pod, biological yield per plant, seed index and harvest index had positive direct relationships with seed yield per plant. These findings indicate that effective selection based on these traits may improve chickpea seed yield.
Surbhi Gour, G. M. Lal, Aditya Mohan Maharishi et al.· Plant cell biotechnology and...· 0 citations
Genetic variability generated through segregation provides an effective opportunity to identify superior recombinants for tomato improvement. The present investigation was conducted using the F₂ population derived from the cross IIHR-2761 × IIHR-2725. The experiment was conducted during Rabi 2025 at the Main Agricultural Research Station, University of Agricultural Sciences, Dharwad. A total of 175 F₂ plants were evaluated for ten quantitative traits associated with growth and yield. Moderate to high variability was observed for most of the traits studied. High PCV was recorded for number of fruits per cluster (22.99%), number of fruits per plant (25.17%) and fruit yield per plant (27.09%), whereas moderate GCV was observed for number of branches per plant (12.69%), number of clusters per plant (12.62%) and fruit yield per plant (19.91%). High broad-sense heritability was observed for plant height (98.39%), days to maturity (93.04%), number of branches per plant (79.49%) and number of clusters per plant (68.45%), while high genetic advance as per cent of the mean was recorded for fruit yield per plant (30.15%), number of branches per plant (23.31%) and number of clusters per plant (21.50%), indicating favourable prospects for selection. Frequency-distribution analysis revealed both positive and negative skewness among the studied traits, suggesting differential gene action governing their inheritance, whereas most traits exhibited platykurtic distributions, indicating polygenic control. Several superior transgressive segregants beyond the mean ±1 SD and mean ±2 SD thresholds were identified for yield and its associated traits, particularly number of fruits per cluster, number of fruits per plant and fruit yield per plant. The identified segregants provide valuable breeding material for developing high-yielding tomato cultivars through selection in advanced generations.
I. Jyoti, S. A. Desai, K. Narendra et al.· Journal of Advances in Biolo...· 0 citations
Tomato (Solanum lycopersicum L.) is an important vegetable crop valued for its nutritional quality, wide adaptability and economic significance. The present study was conducted to evaluate genetic variability, character association and genetic diversity among tomato accessions for yield and its contributing traits. The experiment was carried out during the spring-summer season of 2020 and 2021 at the experimental field of horticulture, School of Agriculture, Lovely Professional University. A total of 26 tomato accessions, comprising 6 repatriated genotypes and 20 hybrids developed through a full diallel mating design, were evaluated in a randomised complete block design (RCBD) with 3 replications and 15 quantitative and quality-related characters. Significant variation was found among the different germplasms for all characters. Yield and yield contributing characters showed high heritability along with genetic gain, indicating major role of these characters in expression of these characters. Yield per plant exhibited a strong and positive relationship with number of fruits per plant, fruit width, fruit length and mean fruit weight. Path coefficient analysis indicated that the number of fruits per plant and reducing sugar content exerted the highest positive direct influence on yield. Principal component analysis explained 81.70 % of the total variation through five components. Cluster analysis grouped accessions into two major clusters irrespective of geographic origin, indicating wide genetic diversity. Accessions T10 and F1022 were identified as the most divergent and may serve as promising parents for yield improvement in tomato breeding programs.
S. Vinit, K. Khushboo, T. Nikhil et al.· Plant Science Today· 0 citations
The present study was carried out at the Main Experiment Station, Horticulture, Department of Horticulture, NDUAT, Kumarganj, Faizabad to evaluate the genetic variability of 42 genotypes of Isabgol. The experiment was laid out during the rabi season (2011-12) in randomized block design replicated twice with the plant spacing 30x10 cm. The findings of the experiment revealed that there was enough variability in the genotypes studied for the characters plant height, numbers of tillers per plant, days taken to first emergence of spike, days taken to 50% flowering, number of spikes per plant, test weight and seed yield per plant. The highest estimates of phenotypic and genotypic coefficient of variation were observed in seed yield per plant (PCV=26.598, GCV=25.016%) followed by number of spikes per plant (PCV=23.309%, GCV=22.028%), while least in days taken to 50% flowering. All the characters showed high heritability, however days taken to first emergence of spike (99.7%) and test weight (98.9%) had maximum heritability. Higher genetic advance was observed for number of spike (16.427). High heritability associated with high genetic advance in present of mean recorded for days taken to first emergence of spike (h2 =99.7%, GA=7.707). However highest genetic advance in present of mean was observed for seed yield per plant (48.468g).
Sachin Tyagi, O. P. Singh· Ecology, environment & conse...· 0 citations
Twenty cucumber (Cucumis sativus L.) genotypes were evaluated during the summer of 2022 at the Horticultural Research Centre, Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut, Uttar Pradesh, to estimate genetic variability and selection parameters for 16 quantitative traits. The experiment was laid out in a randomised block design (RBD) with three replications at 90 × 60 cm spacing. Analysis of variance (ANOVA) revealed highly significant differences among genotypes for all traits, indicating the presence of substantial variability. High genotypic and phenotypic coefficients of variation were recorded for average fruit weight, fruit yield per hectare, vine length and number of fruits per plant, while all traits exhibited high heritability coupled with moderate to high genetic advance as percent of mean, suggesting the predominance of additive gene action. Fruit yield per hectare showed highly significant and positive correlations with fruit yield per plot, fruit diameter, number of fruits per plant, average fruit weight, number of leaves per plant, fruit length and vine length at both genotypic and phenotypic levels, whereas days to first male and female flower anthesis and days to first fruit harvest were negatively associated. Genotypic path analysis revealed high positive direct effects of fruit diameter, fruit yield per plot, days to first male and female flower anthesis, vine length, node number to first male and female flower anthesis, number of fruits per plant and average fruit weight on fruit yield per hectare. Mahalanobis D² analysis grouped the genotypes into five clusters, with maximum inter–cluster distance between clusters III and V, indicating high genetic divergence and suggesting that crosses between these clusters may produce superior segregants for yield and related traits.
T. Vikash, S. Bijendra, S. Sudhanshu et al.· Plant Science Today· 0 citations
A study was undertaken with 20 genotypes of tomato (Solanum lycopersicum L.) to evaluate 16 quantitative and qualitative traits and 2 biochemical traits to estimate the genetic variability between yield and its components at the Centre for Protected Cultivation Technology, ICAR-IARI, New Delhi during 2020–2021 and 2021–2022. Among all genotypes, 596 were found promising for both yield and quality traits. Yield showed significant positive correlation with average fruit weight (28.99 g), pericarp thickness (0.37 cm), equatorial diameter of fruits (1.25 cm) and number of fruits (79.63). Formation of 5 clusters in dendrogram show the similarity among different traits. Genotype T-53 recorded the highest acidity (0.395 %) whereas genotype T-20 recorded the highest T.S.S. (8.2 0brix). Genotype 596 recorded the highest yield/1000 sq m (144.27 q)
P. K. Singh, R. Gautam, Zakir Hussain et al.· Progressive Horticulture· 0 citations
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