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Genetic Variability, Correlation and Path Analysis for Yield and Its Component Traits in Restorer Lines of Rice

M. Z. Islam
Genetic Resources and Seed Division, Bangladesh Rice Research Institute (BRRI), Gazipur -1701

M. A. K. Mian
Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur -1706

N. A. Ivy
Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur -1706

N. Akter
Genetic Resources and Seed Division, Bangladesh Rice Research Institute (BRRI), Gazipur -1701

M. M. Rahman
Regional Station-Satkhira, Bangladesh Rice Research Institute (BRRI), Bangladesh.

Abstract/ Executive Summary:

Twenty-nine restorer lines of rice were evaluated for fourteen agro- morphological traits during Boro (irrigated rice) season of 2012-2013 at Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur, and Bangladesh. Analysis of variance revealed significant differences among the restorer lines for all the traits studied. The phenotypic coefficient of variation (PCV) was higher than genotypic coefficient of variation (GCV) for all the traits indicating the presence of little environmental influence in the phenotypic expression. Heritability estimate was found high for all the yield contributing traits. High heritability along with high genetic advance as per cent of mean was recorded for secondary branches per panicle followed by number of effective tillers, flag leaf area and panicle weight. Contrary, days to flowering and days to maturity showed high heritability coupled with low genetic advance as per cent of mean. Pearson correlation revealed grain yield had positive association with number of effective tillers per hill, panicle length, spikelet fertility, flag leaf area, plant height and thousand grain weights. Mentioned characters also found positive association with yield in both genotypic and phenotypic level. Spikelet fertility, number of secondary branches per panicle, thousand grain weights and number of effective tillers possessed higher positive direct effect on grain yield. It indicated the importance of these traits as selection criteria of yield improvement in hybrid rice programme.

Keywords: Variability, Heritability, Correlation, Path Co-efficient, Restorer line, Rice

Location: Department of Plant breeding and Genetics, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU)

Start Date: 00-11-2012

End Date: 00-04-2013

Program Area: Variety and Species

Commodity: Rice

Objectives:

This study was conducted to identify the most important characters for breeding programme by exploiting the genetic variation, heritability, and path analysis of yield and related attributes of 29 restorer lines of rice.

Methodology:

A total of twenty-nine (29) restorer lines of rice were collected from Department of Plant breeding and Genetics, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU). The R lines were grown at BSMRAU farm during Boro season of 2012-2013 using a randomized complete block design with three replications. Thirty days old seedlings of each R lines of rice were transplanted on the 5 January, 2013 using single seedling per hill in 2.4m² plot with 25 cm and 20 cm space between rows and plants, respectively. Fertilizers were applied @ 290:130:120: 100:15 kg Urea-TSP-MP- Gypsum- ZnSO₄ per hectare. Total Urea was applied in three splits at 15 days after transplanting (DAT), 35 DAT, and just before flowering. Intercultural operations and pest control measures were done as and when necessary during the whole growing period. Observation was made from ten selected plants and data were taken on flag leaf area (cm²), plant height (cm), effective tiller number, days to flowering, days to maturity, panicle length (cm), five panicle weight (g), primary braches per panicle, secondary branches per panicle, spikelet fertility (%), grain length (mm), grain breadth (mm), 1000- grain weight (g) and yield per 10- hills (g). Genotypic and phenotypic co-efficient of variation were calculated following the methodology delineated by Burton (1952), while the estimates of heritability and genetic advance were computed as per the procedures elaborated by Burton and Devane (1953), and Johnson et al. (1955), respectively. Normal Pearson’s correlation and path coefficient analysis was undertaken using R software (version 3.2.1). Furthermore, Genotypic and phenotypic correlation coefficients were calculated with META-R software.

Source of Information: Bangladesh J. Agril. Res. 44(2): 291-301, June 2019 ISSN 0258-7122 (Print), 2408-8293 (Online)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Negative direct effect was observed for number of days to maturity, panicle length, number of primary branches, grain length and grain width. The residual effect of the present study was 0.299 indicated 70.1% of the variability was accounted for 14 yield contributing traits. This result gave an impression that the rest amount of variability might be controlled by other yield contributing traits that was not considered in the present study. Significant genetic variability among the yield contributing traits of 29 restorer lines of rice, depicted their superiority in contribution of variation in the study. Furthermore, considering the results of character association and path analysis it is indicated that effective tiller number, percentage of spikelet fertility and 1000- grain weight may be considered for yield improvement.

Knowledge Management: Journal