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Estimation of Gene Action and Variance Components of Some Reproductive Traits of Rice (oryza Sativa L) Through Line X Tester Analysis

Ariful Islam MD
Dept of GPB, EXIM Bank Agricultural University, Bangladesh.

Khaleque Mian MA
Department of GPB, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Bangladesh.

Golam Rasul
Department of GPB, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Bangladesh.

Khaliq QA
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Bangladesh.

Mannan Akanda MA
Department of Plant Pathology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Bangladesh.

Abstract/ Executive Summary:

Twenty one parents (five cm S lines and sixteen Restorer lines) were considered for through line x tester analysis to study gene action and combining ability effects of developed cm S and restorer lines. Experiment was carried out at the experimental farm, Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Bangladesh in Boro 2011-12 following RCBD design in three replications. Significant genotypic variances for yield related traits indicated that there were significant variations among the genotypes. Significant gca variances along with additive variance component for reproductive traits indicated the accessibility of additive gene action. Degree of dominance were found negative for most of traits which reveals that regression lines passing below the origin i.e., this character are responsible for over dominance. The linear non-significant relationship between female vs male indicates the reliability of the crosses to go through heterosis breeding. The contributions of lines were found significant indicating preponderance of dominant genes among the lines with tester. The significant interaction of line x tester indicated higher estimates for sca variances. Four restorer lines showed significant negative effects for days to 1st flowering, 80% flowering and days to maturity. Three pollen parents and one cm S line, showed significant positive gca effects for pollen fertility while six pollen parents showed significant positive effects for spikelet’s fertility but two pollen parents showed significant positive gca effects for both panicle and stigma exertion rate. The estimated of gca effects of parents indicated that five pollen parents contributed highly significant negative effects for plant height which were responsible for dwarfing character. Fifteen crosses showed significant negative sca estimates for days to first flowering, sixteen crosses for days to 80% flowering and twenty crosses for days to maturity. Among 80 crosses fifty two crosses showed significant positive sca effects along with above average perse performances for grain yield.

Keywords: General combining ability; Specific combining ability; Gca effects; Perse performances

Location: Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur

Start Date: 00-00-2011

End Date: 00-00-2012

Program Area: Variety and Species

Commodity: Rice

Objectives:

1. To determine the extent of general combining ability variances in some morpho- reproductive strains for selection of suitable parents.

2. To determine the extent of specific combining ability effects and perse performances in some morpho- reproductive trains for selection of suitable parents.

Methodology:

To study combining ability effects of developed cm S and restorer lines an experiment was carried out at the experimental farm, Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur during Aman and Boro following RCBD design in three replications. Five known cm S lines and sixteen developed R-lines were considered for through line x tester analysis. Analysis of variance for general and specific combining ability (gca and sca) were estimated according to line x tester method. Five female parents i.e., IR 58025A, BRRI 1A, GAN46A, IR 68888A and IR 62820A and sixteen male parents i.e., RG-BU08-001R, RG-BU08-002R, RG-BU08-005R, RG-BU08-006R, RG-BU08-007R, RG-BU08-013R, RG-BU08-016R, RG-BU08-018R, RG-BU08-025R, RG-BU08-034R, RG-BU08-038R, RG-BU08-046R, RG-BU08-057R, RG-BU08-063R, RG-BU08-097R and RG-BU08-105R were used in the experiment. Data were collected from 10 hills of each genotype on 10 randomly selected individual plant basis were plant height, days to 1^stflowering, days to 80% flowering, days to maturity and grain yield (ton/ ha). Data obtained for each character was subjected to the analysis of variance following three replicated randomized complete block design by using GENSTAT program

Source of Information: J Rice Res 2015, Vol: 3(3), ISSN: 2375-4338

Article Link (Online Journal): http://dx.doi.org/10.4172/2375-4338.1000144

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Significant genotypic variances for yield related traits indicated that there were significant variations among the genotypes. Significant gca variances along with additive variance component for reproductive traits indicated the accessibility of additive gene action. Degree of dominance were found negative for most of traits which reveals that regression lines passing below the origin i.e., this character are responsible for over dominance. The linear non-significant relationship between female vs male indicated the reliability of the crosses to go through heterosis breeding. The contributions of lines were found significant, indicating preponderance of dominant genes among the lines with tester. The significant interaction of line x tester indicated higher estimates for sca variances. Four restorer lines showed significant negative effects for days to 1^st flowering, 80% flowering and days to maturity. Three pollen parents and one cm S line, showed significant positive gca effects for pollen fertility while six pollen parents showed significant positive effects for spikelets fertility but two pollen parents showed significant positive gca effects for both panicle and stigma exertion rate. The estimated gca effects of parents indicated that five pollen parents contributed highly significant negative effects for plant height which were responsible for dwarfing character. Fifteen crosses showed significant negative sca estimates for days to first flowering, sixteen crosses for days to 80%flowering and twenty crosses for days to maturity. Among 80 crosses fifty two crosses showed significant positive sca effects along with above average perse performances for grain yield.

Knowledge Management: Journal