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Genetic Variability and Character Associations in Irrigated Rice (oryza Sativa L)

S. Ghosal
Plant Breeding Division Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh.

P. L. Biswas
Plant Breeding Division Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh.

M. Khatun
Plant Breeding Division Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh.

S. Khatun
Plant Breeding Division Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh.

Abstract/ Executive Summary:

Eighteen advanced breeding lines were evaluated for yield and yield contributing characters to observe their variability, associations and direct and indirect effect on yield during Boro season, 2009. All the tested characters showed significant variation. Effective tillers/m² and spike let sterility (%) had high genotypic variance, high heritability, high genetic advance and high genotypic coefficient of variation. Effective tillers/m², panicle length (cm), thousand grain weight (g) and growth duration (days) showed significant positive association with grain yield. Path coefficient analysis also revealed that effective tillers/m², thousand grain weight (g) and growth duration (days) had higher direct effects on yield (t/ha). All together with the genetic variability, correlation and path analysis revealed that effective tillers/m2, thousand grain weight (g) and growth duration (days) 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 irrigated rice.

Keywords: Rice, GCV, PCV, Heritability, Genetic advance,Correlation, Potential.

Location:

Start Date: 00-00-2008

End Date: 00-00-2009

Program Area: Variety and Species

Commodity: Rice

Objectives:

To explore the characters highly responsible for high yield potential.

Methodology:

Eighteen advanced breeding lines were evaluated at the BRRI regional station, Comilla during the year 2008-09 under irrigated rice ecosystem using RCB design with three replications. Forty two days old seedlings were transplanted 16.2m² area using single seedling per hill. Fertilizer doses were 80:60:40 kg N P K and 70 kg Gypsum per hectare. Except N all other fertilizers were used as basal dose and N fertilizer was top dressed in three equal splits at 15, 30 and 45 days after transplanting. Standard crop management practices were done as and when necessary. Data on plant height (cm) effective tillers per m², panicle length (cm), spike let sterility %, 1000 grain weight (g) and growth duration (days) were taken from randomly selected ten plants from each plot. Yields were taken from whole plot crop cutting and converted it to ton per hectare. Genotypic variance (σ²g), phenotypic variance (σ²p), genotypic coefficient of variation (GCV %), phenotypic coefficient of variation (PCV %), heritability (h²b %), genetic advance (GA) and genetic advance in percent mean (GAPM) were estimated by the formula suggested by Singh and Choudhary (1985). 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 (Sivasubramanian and Madhavamenon, 1973). The heritability was categorized as suggested by Robinson et al. (1949). Again, genetic advance was classified by adopting the method of Johnson et al. (1955).

Source of Information: Bangladesh J. Pl. Breed. Genet., 23(2): 23-27, 2010

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

. All the tested characters showed significant variation. Effective tillers/m² and spikel et sterility (%) had high genotypic variance, high heritability, high genetic advance and high genotypic coefficient of variation. Effective tillers/m², panicle length (cm), thousand grain weight (g) and growth duration (days) showed significant positive association with grain yield. Path coefficient analysis also revealed that effective tillers/m², thousand grain weight (g) and growth duration (days) had higher direct effects on yield (t/ha). All together with the genetic variability, correlation and path analysis revealed that effective tillers/m2, thousand grain weight (g) and growth duration (days) 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 irrigated rice.

Knowledge Management: Journal