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Genetic Study and Selection in F4 Generation of Rice (oryza Sativa L.)

Pangkaj Kumar Rai
Dept.of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur

Uma Kanta Sarker
Dept.of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur

A.K.M. Sajjadul Islam
Hybrid Rice Division, BRAC Agricultural Research and Development Centre, Gazipur

Md. Asif Rahman
Dept.of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur

Monjur Hasan
Vegetable Division, BRAC Agricultural Research and Development Centre, Gazipur, Bangladesh

Abstract/ Executive Summary:

An attempt was made to study the variability in 25 F4 generation of T. Aman rice. Highly significant variations were obtained for all the characters studied. The highest mean and range value was observed for grain yield per meter square followed by number of filled grains per panicle, spikelet sterility (%) and 1000-grain weight. Highest genotypic variance was observed for grain yield per meter square followed by plant height, number of filled grains per panicle and spikelet sterility (%) whereas the highest genotypic coefficient of variation was recorded for spikelet sterility (%) followed by grain yield per meter square, panicle weight and plant height. Phenotypic variance was close to the corresponding genotypic variance for all the traits studied except plant height, panicle size, weight and branching habit. On the other hand, all the characters showed close phenotypic and genotypic coefficient of variation except panicle weight and spikelet sterility (%) which indicated additive gene action for expression of the characters. Considering mean, range and all genetic parameters selection could be performed on the basis of number of tillers per hill, number of panicles per hill, panicle length, number of filled grains per panicle, spikelet sterility (%), 1000-grain weight and grain yield per square meter for significantly improvement of rice yield.

Keywords: Heritability, Variability, Selection, F4 Generation, Rice (Oryza sativa L.)

Location: Dept.of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur

Start Date: 00-07-2011

End Date: 00-12-2011

Program Area: Variety and Species

Commodity: Rice

Objectives:

This experiment was conducted to study the variability among the F4 generation of rice genotypes and to find out the genetic parameters in the selected genotypes.

Methodology:

Previously produced twenty five F4 generation materials from 8 x 8 diallel cross were grown in randomized complete block design (RCBD) with three replications during Aman season in 2011. Plot size was 1 m x 2 m. Twenty cm plant to plant and row to row spacing respectively were maintained. Urea, TSP, MP and gypsum were applied @ 150-100-70-60 kg/ha, as recommended for rice cultivation. Thirty days old seedlings were transplanted in the experimental units. Normal intercultural practices and plant protection measures were followed to raise the crop successfully. One m² area was harvested for measuring grain yield. Data were collected from 10 randomly selected hills of each genotype. Data were recorded on plant height at maturity (cm), number of tillers per hill, number of panicles per hill, panicle length (cm), panicle weight (g), number of primary branches per panicle, number of secondary branches per panicle, number of filled grains per panicle, spikelet sterility (%), 1000-grain weight (g), days to flowering, days to maturity and grain yield per meter square (g). All the data obtained from each trait were statistically analyzed. The analysis of variance was done according to Goulden’s methods (1959). Genotypic coefficient of variation was computed using the formula suggested by Burton (1952). Heritability in broad sense and genetic advance was calculated according to the methods given by Allard (1960).

Source of Information: J. Biosci. Agric. Res. 08(01): 768-774

Article Link (Online Journal): DOI: 10.18801/jbar.090116.92

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Highest mean value was observed for grain yield per m² (523.58). This character also exhibited the highest range of variation (383.33-633.33) indicated that all the genotypes showed wide range of variation in respect of this character. Phenotypic variance was more or less higher than the corresponding genotypic variance for the characters. However, these differences were in case of plant height, number of secondary branches per panicle, number of filled grains per panicle, and spikelet sterility (%) indicating greater influence on environment for expression of these characters. Among the characters, days to maturity, tillers per hill, number of panicles per hill, panicle length, panicle weight, number of primary branches per panicle,1000-grain weight showed least difference between phenotypic and genotypic variance, which indicated additive gene action for expression of the characters. All the characters showed moderate to high phenotypic and genotypic coefficient of variation except days to maturity (22.41 and 20.33). Among the characters the highest genotypic coefficient of variation was recorded for grain yield per m² (51576.44) followed by filled grain per panicle (2116.36), plant height (1974.01), spikelet sterility (%) (139.99), days to flowering (67.43), number of secondary branches per panicle (64.86), 1000-grain weight (57.42), panicle length (11.06), in order to merit. The highest heritability value was observed for plant height (91.09) and the lowest for panicle weight (41.73). Highest genetic advance in percent of mean was observed for 1000-grain weight (40.64), followed by panicle weight (19.31), panicle per hill (13.74), tillers per hill (13.43), number of filled grains per panicle (9.09), where the lowest for plant height (1.35). The parameter 1000-grain weight showed both the moderate heritability and highest genetic advance in percent of mean, indicated additive gene action for expression of the character and selection for such trait might be rewarding. Plant height showed high heritability but low genetic advance in percent of mean. It revealed non-additive gene action for expression of the character. High heritability was exhibited due to favorable environment rather than genotype.

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