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Genetic Diversity of Some Restorer Lines for Hybrid Rice Development

M. U. KULSUM
Hybrid Rice Project, Bangladesh Rice Research Institute (BRRI), Gazipur 1701

M. J. HASAN
Hybrid Rice Project, Bangladesh Rice Research Institute (BRRI), Gazipur 1701

H. BEGUM
GRSD, Bangladesh Rice Research Institute (BRRI), Gazipur 1701

M. M. BILLAH
Scientific Officer
Plant Breeding Division, Bangladesh Agricultural Research Institute (BARI), Gazipur 1701. Bangladesh

H. RAHMAN
Hybrid Rice Project, Bangladesh Rice Research Institute (BRRI), Gazipur 1701

Abstract/ Executive Summary:

Genetic divergence of thirty six restorer lines was studied through Mohalanobis’s D² and principal component analysis for nine characters. Genotypes were grouped into five different clusters. Cluster III comprised of maximum number of genotypes (eleven) followed by cluster I and IV. The inter-cluster distance was maximum between clusters II and IV (14.064) indicating wide genetic diversity between these two clusters followed by the distance between cluster II and V (10.353), cluster III and cluster IV (8.588). The minimum inter- cluster distance was observed between cluster I and cluster III (2.885) followed by cluster I and cluster V (4.359) and cluster III and cluster V (4.825) indicating that the genotypes of these clusters were genetically close. The intra cluster distance in the entire five clusters was less, which indicated that the genotypes within the same cluster were closely related. Among the characters, number of tillers/hill, panicle length, number of filled spikelets/ panicle, spikelet fertility % and yield/plant contributed most for divergence in the studied genotypes. It indicates that these parameters can contribute more for yield in hybrid rice development.

Keywords: Rice, Restorer line, Genetic divergence, D2

Location: Bangladesh Rice Research Institute, Gazipur

Start Date: 00-00-2007

End Date: 00-00-2008

Program Area: Variety and Species

Commodity: Rice

Objectives:

To estimate the nature and magnitude of genetic divergence and characters contributing to the genetic divergence of thirty six restorer lines (R lines).

Methodology:

Thirty six restorer lines were grown in a randomized complete block design with three replications at the experimental farm of Bangladesh Rice Research Institute. Gazipur, during Boro season 2007-2008. The experimental site was at 24.00° N latitude and 90.25° E longitude with an elevation of 8.4 meter from the sea level. The whole experimental area was divided into three blocks, representing three replications. Adequate soil fertility was ensured by applying additional quantities of Urea- TSP-MP- Gypsum- ZnSO₄ @ 270:130:120:70:10 kg/ha, respectively. Total TSP, MP, Gypsum, and ZnSO₄were applied in final land preparation. Total Urea was applied in three installments at 15 days after transplanting (DAT), 30 DAT, and 45 DAT. Thirty (30) days old seedlings of restorer lines were transplanted in separate strips with the spacing of 15 x 15 cm between plant to plant and 20 x 20 cm between row to row. Necessary intercultural operation was made during cropping period for proper growth and development of the plants. Data were collected from 10 randomly selected hills of each restorer line on individual plant basis for number of effective tillers per hill, days to 50% flowering, days to maturity, plant height, panicle length, number of filled grains per panicles, spikelet fertility %, 1000-grain weight, and grain yield per plant. Mean data of each character was subjected to multivariate analysis viz. Principal Coordinate Analysis (PCO), Principal Component Analysis (PCA), Cluster Analysis, and Canonical Variate Analysis using GENSTAT 513 (Mahalanobis, 1936; Digby et al., 1989 and Jager et al., 1983).

Source of Information: Bangladesh J. Agril. Res. 36(1) : 21-28, March 2011, ISSN 0258-7122

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Cluster III comprised of maximum number of genotypes (eleven) followed by cluster I and IV. The inter-cluster distance was maximum between clusters II and IV (14.064) indicating wide genetic diversity between these two clusters followed by the distance between cluster II and V (10.353), cluster III and cluster IV (8.588). The minimum inter- cluster distance was observed between cluster I and cluster III (2.885) followed by cluster I and cluster V (4.359) and cluster III and cluster V (4.825) indicating that the genotypes of these clusters were genetically close. The intra cluster distance in the entire five clusters was less, which indicated that the genotypes within the same cluster were closely related. Among the characters, number of tillers/hill, panicle length, number of filled spikelets/ panicle, spikelet fertility % and yield/plant contributed most for divergence in the studied genotypes. It indicates that these parameters can contribute more for yield in hybrid rice development.

Knowledge Management: Journal