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Genetic Variation, Correlation and Selection Indices in Advanced Breeding Lines of Rice (oryza Sativa L.)

S. H. Habib
Genetic Resources and Seed Division, Bangladesh Rice Research Institute,Gazipur-1701, Bangladesh

K. M. Iftekharuddaula
Genetic Resources and Seed Division, Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh

M. K. Bashar
Genetic Resources and Seed Division, Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh

Khaleda Akter
Genetic Resources and Seed Division, Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh

M. K. Hossain
Dept. of Agroforestry & Environmental Science, Sher-E-Bangla Agricultural University, Dhaka-1207

Abstract/ Executive Summary:

Forty advanced breeding lines of rice were studied during T Aman season (rainfed ecosystem) for finding out selection indices, variability and character association for grain yield and its components. All the tested characters were found showing significant variation. The highest genotypic, environmental and phenotypic variances were found in filled grains/panicle followed by plant height. High heritability associated with high genetic advance were obtained in panicles/hill, plant height, filled grains/panicle, 1000- grain weight and grain yield. Genotypic correlation coefficients were higher than the corresponding phenotypic correlation coefficients in most of the cases. Panicle length, panicles/hill and filled grains/panicle showed significant positive correlation with grain yield. Path analysis revealed that filled grains/panicle, panicles/hill and 1000-grain weight had positive and highest direct effects on grain yield. Moreover, panicle length had highest indirect effect on grain yield through filled grains/panicle. Discriminant function analysis revealed that a progressive increase in the efficiency of selection was observed with the inclusion of additional character in the selection index. Among the single variable indices, filled grains/panicle showed maximum relative efficiency over the straight selection for grain yield. The highest relative efficiency was observed with index involving seven characters, days to maturity + panicle length + panicles/hill + plant height + filled grains/panicle + 1000-grain weight + yield (t/ha). However, some of 3- traits, 4- traits, 5- traits, and 6- traits indices were also equally good.

Keywords: Selection indices, Correlation, Path analysis, Yield, Rice (Oryza sativa L)

Location: Bangladesh Rice Research Institute, Joydevpur, Gazipur

Start Date: 00-08-2004

End Date: 00-12-2004

Program Area: Variety and Species

Commodity: Rice

Objectives:

The present investigation is, therefore, carried out in rice with a view to studying the genetic variability, the relationship between yield and yield contributing characters and selection indices and their relative efficiencies, in improvement of grain yield in rice.

Methodology:

The trial was set with forty advanced breeding lines of rice at Bangladesh Rice Research Institute, Joydevpur, Gazipur in a randomized complete block design with three replications during T. Aman season in 2004. Thirty-five days old seedlings grown in wet seedbed were transplanted in 1X 2 m² plots with a spacing of 20 × 20 cm², using one seedling per hill. Fertilizers were applied @ 60:40:40 kg NPK per hectare. The fertilizers were applied at final land preparation except nitrogen. 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 done as and when become 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 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), were recorded from randomly selected five plants from each plot and used in the analysis. Genetic variance (σ²g), environmental variance (σ²e), 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 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). Selection indices were constructed using the methods developed by Smith (1936) based on the discriminant function of Fisher (1936). Selection indices and their relative efficiencies in terms of expected genetic advance in yield were calculated according to the method stated by Singh and Chaudhary (1985).

Source of Information: Bangladesh J. Pl. Breed. Genet., 20(1): 25-32, 2007

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Among the single variable indices, filled grains/panicle showed maximum relative efficiency over the straight selection for grain yield. The highest relative efficiency was observed with index involving seven characters, days to maturity + panicle length + panicles/hill + plant height + filled grains/panicle + 1000-grain weight + yield (t/ha). However, some of 3- traits, 4- traits, 5- traits, and 6- traits indices were also equally good.

Knowledge Management: Journal