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)

Agro-morphological and Genotypic Diversity among Rice Germplasms under Rainfed Lowland Condition

“…This study found highly significant (P <0.01) differences for days to 50% flowering (DTF), days to 85% maturity (DTM), panicle length (PL), plant height (PH), biological yield (BY), harvest index (HI), thousand-grain weight (TGW), grain yield (GY) and the non-significant effect was observed for effective tillers per meter square (ET) (Table 2). As in the present study, significant variation among evaluated rice genotypes was reported by several researchers (Abebe, Alamerew, & Tulu, 2017;Adhikari, Joshi, Shrestha, & Bhatta, 2018;Lipi et al, 2021;Tiwari, Tripathi, Tripathi, Khatri, & Bastola, 2019). In line with our results, Adhikari, Mehera, & Haefele (2018) also reported non-significant variation among genotypes for effective tillers per meter square.…”

“…From our findings, traits like days to flowering and maturity, harvest index, and thousandgrain weight were recognized as important traits based on their heritability. These findings correspond to the results of Kishore, Srinivas, Nagabhushanam, Pallavi, & Sameera (2015), Lipi et al (2021), Singh, Nandan, &Singh (2014), andTiwari, Tripathi, Tripathi, Khatri, &Bastola (2019). Some researchers reported medium heritability for days to flowering and maturity (43-50%), lower to medium heritability for thousandgrain weight and harvest index (25-49%) (Abebe, Alamerew, & Tulu, 2017;Adhikari, Joshi, Shrestha, & Bhatta, 2018).…”

“…Moderate values were obtained for DTF (18.15%), DTM (14.08%), and PL (10.56%), whereas ET (4.51%) 4). Among the genetic parameters, plant breeder looks for the traits with higher heritability in combination with higher genetic advance as a percentage of the mean (GAM) (Lipi et al, 2021). In our findings, plant height, harvest index, and thousand-grain weight were identified as traits with higher heritability and higher values of GAM.…”

“…In our findings, plant height, harvest index, and thousand-grain weight were identified as traits with higher heritability and higher values of GAM. High heritability coupled with high GAM for plant height and thousand-grain weight was reported by Lipi et al (2021) and Singh, Nandan, & Singh (2014). In addition, Abebe, Alamerew, & Tulu (2017) mentioned a similar result for plant height.…”

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.…”