Phenotypic and genotypic correlation co-efficient of quantitative characters and character association of aromatic rice

Abstract

An experiment was conducted in research fields under the Department of Genetics and Plant Breeding of Bangabandhu Sheikh Mujibur Rahman Agricultural University in Bangladesh to study Phenotypic and genotypic correlation coefficient of quantitative characters and character association of aromatic rice. Forty-one aromatic rice germplasm of diverse sources were used to assess the character association and contribution of characters towards grain yield. Path coefficient analyses were carried out for selected genotypes and to find out the direct and indirect effect of component characters on grain yield. Analysis of phenotypic and genotypic correlation coefficient of quantitative characters and partitioning of genotypic correlation to grain revealed that the correlation coefficients of grain yield per hill with 1000-grain weight and harvest index were positive and highly significant. Spikelet sterility showed highly significant negative correlation with grain yield at genotypic level only. The parameter 1000-grain weight showed the highest positive direct effect on grain yield. Panicle length and spikelet sterility showed negative negligible direct effect. The highest positive indirect effect was observed for 1000-grain weight via plant height and the highest negative indirect effect for 1000-grain weight via number of filled grains per panicle. Data of this study might be useful for quantitative assessment of the variation in yield and yield components, their interrelationship, and direct and indirect effects of different characters on grain yield of aromatic rice.

Association of yield and yield related traits in aromatic rice (Oryza sativa L.)

“…The phenotypic correlation between spikelet sterility status (%) vs. spikelet fertility status(%) were negative and significant at1 % level. The results are in agreement with Karim et al (2014) for 1000 grain weight and spikelet sterility status(%). Pleiotrophy and/or linkage may also be genetic the reason for this type of negative association.…”

Traits association and path coefficient analysis of yield and related traits in rainfed lowland rice (Oryza sativa L.) genotypes in North Western Ethiopia

“…Number of filled grain per panicle showed a positive strong to moderate correlation with number of total grain per panicle (r p =0.951**) and biomass yield (r p =0.466**), respectively. However, contrary to the observation of Karim et al (2014) who reported highly significant negative correlation between 1000-grains weight and number of filled grain per panicle. According to Adams and Grafius (1971), the negative correlations arise primarily from competition for a common possibility, such as nutrient supply.…”

“…Mulugeta (2015) reported biomass yield and plant height as the major contributors to yield and had direct effect on yield in upland rice. Karim et al (2014) and Kishore et al (2015) reported that plant height had high direct positive effect on yield. On the other hand, days to heading (-0.020), days to maturity (-0.068), panicle length (-0.062), culm length (-0.580), unfilled grains per panicle (-0.257), filled grains per panicle (-0.503) and thousand grains weight (-0.049) had negative direct loading on yield except on culm length, panicle length, and thousand grains weight but showed positive and significant genotypic correlation with yield.…”

Identification of variability for agronomically important traits in rice mutant families

“…Whereas the control had a mean grain weight of 2.89 g, superior mutant families presented a mean value of 4.40 g. This result observed in these mutants can be related to a greater yield, since the grain mass is a major component of yield (Jeng et al 2006;Song et al 2007;Hasan et al 2013;Karim et al 2014). It is worth emphasizing that this increase in the main panicle grain weight will be relevant provided that there is no reduction in other components of grain yield.…”