Genetic Variation, Heritability and Genetic Advance in Some Promising Rice Hybrids

Abstract

Eleven rice hybrids including two check varieties were evaluated to approximate their genetic variability, heritability and genetic advance for ten quantitative traits. The analysis of variance illustrated that all the quantitative traits differed significantly indicating that enough variation is presenting the studied materials. Among the desirable quantitative traits number of filled spikelet’s per panicle was found to have highest both phenotypic and genotypic variance followed by total number of spikelet’s per panicle. Almost all the characters showed a little variation between PCV and GCV revealing little influence of the environment on the expression of traits. High phenotypic and genotypic variance coupled with high heritability and high genetic advance was observed for number of filled spikelet’s per panicle, total number of spikelet’s per panicle, plant height and number of unfilled spikelet’s per panicle. Such findings stipulated that these traits were governed by additive gene actions which are fixable and these traits may be accounted for reliable index of selection. The genotypes G3 (IR79156A × EL108R) and G6 (IR79156A × EL253R) were selected as high response superior promising rice hybrids for achievable yield advantage 49% and 23%, respectively over best check varieties. Therefore, the G3 and G6 are proposed to be extensively evaluated for further trial of variety release.
 SAARC J. Agri., 18(2): 39-49 (2020)

Studies on Genetic Variability, Divergence and Characters Associated with Yield Components in Rice

“…Low PCV and low GCV were observed for traits viz., days to 50% flowering, panicle length and days to maturity, however indicating little scope for improvement of these traits through selection. Similar kind of results found by Singh et al [9] for days to 50% flowering and panicle length, Lipi et al [10] for days to maturity. Heritability estimates for the various traits studied ranged from 60.25 (harvest index) to 98.09 (flag leaf length).…”

Studies on Genetic Variability, Divergence and Characters Associated with Yield Components in Rice

“…Low PCV and low GCV were observed for traits viz., days to 50% flowering, panicle length and days to maturity, however indicating little scope for improvement of these traits through selection. Similar kind of results found by Singh et al [9] for days to 50% flowering and panicle length, Lipi et al [10] for days to maturity. Heritability estimates for the various traits studied ranged from 60.25 (harvest index) to 98.09 (flag leaf length).…”

Trait prioritization and genotype selection for heat stress tolerance in wheat via structural equation modeling and principal component analysis (PCA)

“…These patterns align with prior reports of low PCV and GCV for PV, GpS, and SpF across conditions, indicating minimal genetic variation and environmental influence ( Lipi et al, 2020 ; Songsri et al, 2008 ). Heritability, as a measure of phenotypic variance attributable to genetic factors, serves a predictive role in crop improvement ( Plavšin et al, 2021 ; Wan et al, 2022 ).…”

Genetic variability and Heritability of Agronomic Traits of Selected Green Super Rice (GSR) Lines in Indonesia

“…Broad sense heritability of seed set (44.70%) is categorized as medium while yield (20.03%) has the lowest categorized as low (Table 2). This finding is agreed with other previous studies in various populations with few variation [19], [20], [21], [22] -V g = Genotypic variance -V p = Phenotypic variance -H 2 = Broad Sense Heritability -St Dev Vg = Standard deviation of genetic variance -GV = Genetic variability Heritability value is indicating the power of genetic factor in expressing the traits. The higher the value, the more genetic factor is powerful to express the trait into phenotypic appearance.…”

Studies on Genetic Variability, Divergence and Characters Associated with Yield Components in Rice

“…Low PCV and low GCV were observed for traits viz., days to 50% flowering, panicle length and days to maturity, however indicating little scope for improvement of these traits through selection. Similar kind of results found by Singh et al [9] for days to 50% flowering and panicle length, Lipi et al [10] for days to maturity. Heritability estimates for the various traits studied ranged from 60.25 (harvest index) to 98.09 (flag leaf length).…”

Trait prioritization and genotype selection for heat stress tolerance in wheat via structural equation modeling and principal component analysis (PCA)

“…These patterns align with prior reports of low PCV and GCV for PV, GpS, and SpF across conditions, indicating minimal genetic variation and environmental influence ( Lipi et al, 2020 ; Songsri et al, 2008 ). Heritability, as a measure of phenotypic variance attributable to genetic factors, serves a predictive role in crop improvement ( Plavšin et al, 2021 ; Wan et al, 2022 ).…”

Genetic variability and Heritability of Agronomic Traits of Selected Green Super Rice (GSR) Lines in Indonesia

“…Broad sense heritability of seed set (44.70%) is categorized as medium while yield (20.03%) has the lowest categorized as low (Table 2). This finding is agreed with other previous studies in various populations with few variation [19], [20], [21], [22] -V g = Genotypic variance -V p = Phenotypic variance -H 2 = Broad Sense Heritability -St Dev Vg = Standard deviation of genetic variance -GV = Genetic variability Heritability value is indicating the power of genetic factor in expressing the traits. The higher the value, the more genetic factor is powerful to express the trait into phenotypic appearance.…”

Studies on Genetic Variability, Divergence and Characters Associated with Yield Components in Rice

“…Low PCV and low GCV were observed for traits viz., days to 50% flowering, panicle length and days to maturity, however indicating little scope for improvement of these traits through selection. Similar kind of results found by Singh et al [9] for days to 50% flowering and panicle length, Lipi et al [10] for days to maturity. Heritability estimates for the various traits studied ranged from 60.25 (harvest index) to 98.09 (flag leaf length).…”

Trait prioritization and genotype selection for heat stress tolerance in wheat via structural equation modeling and principal component analysis (PCA)

“…These patterns align with prior reports of low PCV and GCV for PV, GpS, and SpF across conditions, indicating minimal genetic variation and environmental influence ( Lipi et al, 2020 ; Songsri et al, 2008 ). Heritability, as a measure of phenotypic variance attributable to genetic factors, serves a predictive role in crop improvement ( Plavšin et al, 2021 ; Wan et al, 2022 ).…”

Genetic variability and Heritability of Agronomic Traits of Selected Green Super Rice (GSR) Lines in Indonesia

“…Broad sense heritability of seed set (44.70%) is categorized as medium while yield (20.03%) has the lowest categorized as low (Table 2). This finding is agreed with other previous studies in various populations with few variation [19], [20], [21], [22] -V g = Genotypic variance -V p = Phenotypic variance -H 2 = Broad Sense Heritability -St Dev Vg = Standard deviation of genetic variance -GV = Genetic variability Heritability value is indicating the power of genetic factor in expressing the traits. The higher the value, the more genetic factor is powerful to express the trait into phenotypic appearance.…”