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Genetic Analysis and Selection Criteria in Advanced Breeding Lines of Deep Water Rice

Khaleda Akter
Genetic Resources and Seed Division Bangladesh Rice Research Institute Gazipur

S. H. Habib
Genetic Resources and Seed Division Bangladesh Rice Research Institute Gazipur

M. K. Bashar
Genetic Resources and Seed Division Bangladesh Rice Research Institute Gazipur

A. M. Nurunnabi
Researcher
Hybrid Rice Project, Bangladesh Rice Research Institute, Gazipur

Abstract/ Executive Summary:

Thirty advanced breeding lines of deep-water rice were evaluated during T. Aman season (rainfed ecosystem) with a view to finding out variability and genetic association for grain yield and its component characters. All the tested characters showed significant variation. The highest genetic variability was obtained in filled grains/panicle followed by plant height. Panicles/plant, filled grains/panicle and grain yield had high genetic coefficient of variation and heritability in broad sense coupled with high genetic advance in percentage of mean. Panicle length, panicles/plant, plant height, filled grains/panicle and harvest index showed significant positive association with grain yield. Path coefficient analysis also revealed maximum positive and direct contribution of filled grain to grain yield followed by panicles/plant, 1000-grain weight and flag leaf area. Moreover, plant height had the highest indirect effect on grain yield through filled grains/panicle. Flag leaf area, harvest index and panicle length also had higher positive indirect effect on grain yield through filled grains/panicle

Keywords: Variability, Correlation, Path analysis, yield, Breeding, Deep water rice

Location: Joydevpur, Gazipur

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Rice

Objectives:

Therefore, the present study was conducted to explore the major characters responsible for high yield potential.

Methodology:

The trial was set with thirty advanced breeding lines of deep water rice at Bangladesh Rice Research Institute, Joydevpur, Gazipur in a randomized complete block design with three replications during T. Aman season in 2004. Though the DWR is grown under flooded condition this experiment was conducted under rainfed during T Aman season in 2004. Thirty-five days old seedlings grown in wet seedbed were transplanted in 1× 2 m² plots with a spacing of 20 x 20 cm, using one seedling per hill. Fertilizers were applied @ 60:40:40 kg NPK per hectare. All other recommended nutrients were applied except nitrogen at final land preparation. Nitrogen was applied in three equal splits, at 15 days after transplanting (DAT), 45 DAT and just before panicle initiation. Intercultural operations and pest control measures were employed as and when necessary during whole growing period. At maturity, grain yield (t/ha) was taken excluding border area and yield was adjusted at 14% moisture level. Grain yield in t/ha (GY) along with flag leaf area (FLA), days to maturity (DM), panicle length in cm (PL), panicles/hill (PN), plant height in cm (PH), filled grains/panicle (FG), 1000-grain weight in g (TGW), grain length/breadth ratio (L/B) and harvest index (HI) were recorded from randomly selected five plants from each plot and used in the analysis. Genetic variance (σ ²g), environmental variance (σ ²e), phenotypic variance (σ²p), genotypic coefficient of variation (GCV), phenotypic coefficient of variation (PCV), heritability in broad sense (Hb), genetic advance in percentage of mean (GAPM), genotypic correlation coefficients (rg) and phenotypic correlation coefficients (rp) and path coefficient analysis were performed following Singh and Chaudhury (1985). The estimates 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., 20(1) : 39-45, 2007

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In spite of highly significant positive correlation with grain yield; harvest index exhibited negative direct effects on grain yield, which has been overcome by its positive and remarkable indirect effects on grain yield through filled grains/panicle, 1000-grain weight and other yield contributing characters. The residual effect of the present study was 0.43, indicating that 57 per cent of the variability in grain yield was contributed by the nine characters studied in the path analysis. It is suggested that maximum emphasis should be given on the above characters in selecting deep- water rice with higher yield. It is also suggested that further study should be made with more characters under deep water condition to find out other traits, which contribute rest of the percentage of the yield. The correlation and path analysis showed that panicles/plant, plant height, filled grains/panicle and harvest index were the most important traits to be selected for the modern rice varieties. The characters also showed moderate to high heritability and genetic advance in percentage of mean. Number of filled grains/panicle showed highest direct positive effect and as a result it gave highly significant positive correlation with yield which suggests it to be considered as an important yield component.

Knowledge Management: Journal