Genetic variability, character association and diversity analyses for economic traits in rice (Oryza sativa L.)

Abstract

One hundred high yielding rice genotypes were evaluated to determine character association, variability and diversity for grain yield, yield components and quality characters. High estimates of heritability, genetic advance, genotypic and phenotypic coefficients of variation were recorded for panicle hill-1, flag leaf area and grain yield hill-1. Majority of the traits showed significant and positive associations between yield and yield components like biological yield hill-1 followed by harvest-index as most important traits which need due consideration at the time of devising selection strategy. Thus, presence of several contrasting types of inter-relationships simultaneously would bring improvement in others due to correlated responses. Path analysis might have resulted into cancellation of contrasting associations by each other which ultimately lead to lowering of the net impact. This suggested that selection would be quite efficient in improving yield and yield components in context of germplasm evaluated. The crossing between superior genotypes of above diverse cluster pairs may provide desirable transgressive segregants for developing high yielding varieties of aromatic and non-aromatic rice. Thus, hybridization of Swarna of cluster XI with promising genotypes of cluster VI (Narendra 118, Vandana, Narendra 1, Akashi and Narendra 97) is recommended. DOI: http://dx.doi.org/10.3329/sja.v10i2.18326 SAARC J. Agri., 10(2): 83-94 (2012)

Phenotypic (assessment of rice Oryza sativa L.) genotypes for genetic variability and varietal diversity under direct seeded condition

“…The genetic advance was highest for grain yield/ha (39.639) followed by filled grain per panicle (51.39), while low genetic advance was observed for panicle length (0.139) ( Table 2). Similar results were also reported by Pratap et al (2012) and Gangashetty et al (2013) in rice. Heritability coupled with expected genetic advance for a trait will help us in deciding the scope of improvement of that particular trait through selection (Johnson et al, 1955).…”

Genetic Variability, Character Association, Frequency and Normality Distribution Studies for F2 Population of BPT-5204 x WAB-450 Cross

“…Similar results were also reported by Pratap et al, (2012), Gangashetty et al, ((2013) and Khare et al, (2014). While, moderate GA as % mean was recorded for plant height, panicle length and panicle exsertion followed by low GA as per cent of mean was recorded by traits days to 50% flowering and flag leaf length.…”

Evaluation of Character Association in Barley (Hordeum vulgare L.) Genotypes for Yield and Yield Related Traits

“…Number of grains/spike had significant positive correlation with number of tillers/plant in case of both the two rowed and six rowed barley genotypes. The available literature has also indicated the similar findings in barley (Ogunbayo et al [21], Zahid et al [22], Yadav et al [23], Pratap et al [24], Al-Tabbal et al [15], Singh et al [11], Yadav et al [20] and Lodhi et al [12]).…”