Genetic Variability and Selection Criteria in Rice Mutant Lines as Revealed by Quantitative Traits

Abstract

Genetic based knowledge of different vegetative and yield traits play a major role in varietal improvement of rice. Genetic variation gives room for recombinants which are essential for the development of a new variety in any crop. Based on this background, this work was carried out to evaluate genetic diversity of derived mutant lines and establish relationships between their yield and yield components using multivariate analysis. To achieve this objective, two field trials were carried out on 45 mutant rice genotypes to evaluate their growth and yield traits. Data were taken on vegetative traits and yield and its components, while genotypic and phenotypic coefficients, variance components, expected genetic advance, and heritability were calculated. All the genotypes showed variations for vegetative traits and yield and its components. Also, there was positive relationship between the quantitative traits and the final yield with the exception of number of tillers. Finally, the evaluated genotypes were grouped into five major clusters based on the assessed traits with the aid of UPGMA dendrogram. So hybridization of group I with group V or group VI could be used to attain higher heterosis or vigour among the genotypes. Also, this evaluation could be useful in developing reliable selection indices for important agronomic traits in rice.

Genetic diversity analysis of selected Capsicum annuum genotypes based on morphophysiological, yield characteristics and their biochemical properties

“…This research was supported by Meena et al . and Oladosu et al ., in which high heritability was observed in some yield characters: number of fruit per plant, length of fruits and yield of fruit per plant. On the contrary, the low level of heritability and the GA indicate the role of non‐additive genes in these traits, which could be improved through heterosis breeding .…”

Estimation of genetic parameters in some exotic genotypes of rice (Oryza sativa L.) in rabi season

“…All the characters showed high estimate of heritability (more than 65%) except total tillers per plant, productive tillers per plant and panicle length. The results were in conformity with those of Ravindra Babu et al (2012), Sravanet al (2012 and Oladosu et al (2014).The highest genetic advance as per cent of mean was observed for grains per panicle (45.50%) followed by straw yield per plant (31.71%), grain yield per plant (28.67%), total tillers per plant (19.69%), plant height (17.84%) and productive tillers per plant (16.05%). Similar results were also obtained by Sravan et al (2012) for plant height, spikelet fertility and productive tillers per plant High heritability coupled with high genetic advance as per cent of mean observed for grains per panicle, straw yield per plant, 1000 grain weight and grain yield per plant indicate that most likely the traits are under control of additive genes and hence selection may be effective.…”

Induced Mutation for Genetic Improvement in Black Rice Using Gamma-Ray

“…Plant height character is important in rice plant breeding because it is closely related to the affective utilization of assimilation to improve plant product. Genotype with high production is characterized as short stem and hence the division of assimilation will be very effective (Oladosu et al, 2014). Basically, Melik variety had the lowest plant height compared to Cempo Ireng and Cempo Melik that could be observed in no radiation treatment (Fig.…”