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Genetic Variability and Character Association of T-aman Rice (oryza Sativa L)

Ganapati RK
Breeding Division, Bangladesh Sugarcane Research Institute, Bangladesh

Rasul MG
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Bangladesh

Mian MAK
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Bangladesh

Sarker U
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Bangladesh

Abstract/ Executive Summary:

Twenty five genotypes were evaluated for yield and yield contributing characters to observe their variability, associations and direct and indirect effect on yield during Amon season, 2010. Grain panicle^-1 and filled grain panicle^-1 had high genotypic variance, high heritability, high genetic advance and high genotypic coefficient of variation. Tiller hill^-1, plant height and thousand grain weights showed significant positive association with grain yield. Path coefficient analysis also revealed that, tiller hill^-1, thousand grain weight and grain panicle^-1 had higher direct effects on yield. Genetic variability, correlation and path analysis revealed that tiller hill^-1, plant height and thousand grain weights are the most important yield components in rice. Therefore, from the present study it could be suggested that emphasize should be given on these characters for the selection of genotypes for higher grain yield in transplanted Amon rice.

Keywords: Rice, Genetic variability, GCV, PCV, Genetic advance

Location: Breeding Division, Bangladesh Sugarcane Research Institute, Bangladesh

Start Date: 00-00-2010

End Date: 00-00-2010

Program Area: Variety and Species

Commodity: Rice

Objectives:

To explore the characters highly responsible for high yield potential of transplanted amonrice.

Methodology:

Twenty five genotypes including nine parents, eight crosses and their reciprocal crosses are evaluated. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. Thirty days old seedlings were transplanted low land area using single seedling hill^-1. Fertilizer doses were 180:100:70:60 kg Urea, TSP, MP and Gypsum per hectare. Except urea all other fertilizers were used as basal dose and urea fertilizer was top dressed in three equal splits at 15, 30 and 45 days after transplant. Standard crop management practices were done as and when necessary. All data were taken from randomly selected ten plants from each plot. Yields were taken from whole plot crop cutting and converted it to ton hectare^-1. Genotypic variance (σ²g), phenotypic variance (σ²p), genotypic coefficient of variation (GCV %), phenotypic coefficient of variation (PCV %), heritability (h²b %) and Genetic Advance (GA) were estimated. Genotypic and phenotypic correlation coefficient and path coefficient analysis were done through Basica stat. The estimate of GCV and PCV were classified as low, medium and high. The heritability was categorized. Again, genetic advance was classified by adopting the method.

Source of Information: International Journal of Plant Biology & Research, 2(2): 1013, ISSN: 2333-6668,

Article Link (Online Journal): http://www.jscimedcentral.com/PlantBiology/plantbiology-2-1013.pdf

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In correlation studies, with the increasing number of variables, the indirect association becomes complex and important. In such situation, path coefficient analysis is useful to find out direct and indirect causes of associations. Path coefficient analysis permits a critical examination to specific factors acting to produce a given correlation and measures the relative importance of each factor. From the results of path analysis, it was evident that direct positive effects contributed by tiller hill^-1, number of filled grain panicle^-1 and thousand grain weight were high indicating that among the component traits, these four characters contributed maximum for grain yield in rice. These four characters also showed significantly positive genotypic correlation with yield which indicates that selection based on these characters would to be effective. plant height showed negligible direct effect (0.038) but indirect positive effect via tiller per hill, days to maturity and number of filled grain panicle^-1made highly positive significant genotypic correlation with yield (0.807). On the other hand unfilled grain panicle-1 had also positive (negligible) direct effect but its indirect effect through other characters was mostly negative. Grain panicle^-1 showed insignificant positive direct effect (0.532) and insignificant positive genotypic correlation with yield which indicated that indirect causal factors are to be considered. Fifty percent flowering and harvest index show positive direct correlation and days to maturity showed negative direct correlation but all three are negatively significant to grain yield. The residual effect of the present study was 0.164, indicating that 15 percent of the variability in grain yield was contributed by the twelve component characters studied in this path analysis. Similar findings (R=0.766) was found.This gave an impression that a more other characters than those involved in the present study might also contributed to yield. The genetic variability, correlation and path analysis showed that tiller per hill, plant height and thousand grain weights are the most important yield components in rice. Therefore, emphasis should be given on these characters for the selection of genotypes for higher grain yield in rice.

Knowledge Management: Journal