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Selection of Parent for Improvement of Restorer Line in Rice (oryza Sativa L.)

Anowara Akter
Scientific Officer
Hybrid Rice Division Bangladesh Rice Research Institute Bangladesh, Gazipur-1701

M Jamil Hasan
Principal Scientific Officer
Hybrid Rice Division Bangladesh Rice Research Institute Bangladesh, Gazipur-1701

A.K. Paul
Scenior Scientific Officer
Hybrid Rice Division Bangladesh Rice Research Institute Bangladesh, Gazipur-1701

M. M. Motalib
Senior Chemist
Department of Environment Agargaon, Dhaka

M Kamal Hossain
Scenior Scientific Officer
Hybrid Rice Division Bangladesh Rice Research Institute Bangladesh, Gazipur-1701

Abstract/ Executive Summary:

Genetically diverged 44 restorers of rice hybrids were collected through IRHON (International Rice Hybrids Observation Nursery) program from IRRI (Philippines), China, and India in which 4 restorers were from hybrid rice breeding nursery of BRRI (Bangladesh). Genetic divergence was estimated using Mahalanobis’s statistic (D²) and principal component analysis.Cluster analysis revealed 44 restorers were grouped into 5 clusters.The lines chosen from the same ecogeographic region were found scattered in different clusters which indicated that genetic diversity and geographic distribution were not necessarily related. The intercluster distances were higher than the intra-cluster distance reflecting wider genetic diversity among the genotypes of different groups. The highest inter-cluster distance was observed between cluster II & V followed by I and IV where the highest intra-cluster distance was found in the cluster I indicated that the highly divergent types existed in these clusters. Plant height was found to be the maximum contributors towards the total divergence. The genetically diverged lines viz: IR72102-3-107-1-1-2R, IR68445-62-1-3-1R, Gui99R, MH77R, IR44675R, BR736R and IR64680-81-2-2-1-3R with highest mean value for the characters: grain yield, number of effective tillers/m2, plant height, days to maturity, number of spikelets/panicle, spikelet fertility, panicle length, panicle weight and 1000-grain weight were selected as genetically diverse restorers to develop heterotic hybrid combinations with a promising CMS line.

Keywords: Cluster; Genetic diversity; Heterotic hybrid; Restorer.

Location: BRRI HQ, Gazipur

Start Date: 15-11-2007

End Date: 15-05-2008

Program Area: Variety and Species

Commodity: Rice

Objectives:

The present study was, undertaken to identify diverged genotypes, which could be used as parents in developing heterotic rice hybrids.

Methodology:

A total of 44 restorers of rice hybrids were included in the study consisting of 36 lines from IRRI, Philippines, four from BRRI, Bangladesh; and another four from China. All the genotypes were grown at BRRI, Gazipur in Boro (irrigated) season during November 2007 to May 2008. Thirty-days old seedlings of each entry were transplanted in 3m² plots in RCB design with three replications using one seedling per hill with a spacing of 20 cm x 20 cm. Cultural practices were followed to raise the crop as per recommendation for transplanting irrigated rice. Observations from five randomly selected plants from individual plot were recorded for plant height (cm), days to maturity, effective tillers/m², number of spikelets/panicle, flag leaf length (cm), panicle length (cm), spikelet fertility (%), panicle weight (g), 1000-grain weight (g) and grain yield (t/ha). Means of these data over the replications were subjected to both univariate and multivariate analysis. Multivariate analysis viz. Principal component analysis (PCA), Principal co-ordinate analysis (PCO), Cluster analysis (CLU) and canonical vector analysis (CVA) were done by using a computer software GENSTAT 5.13 program of IBM computer. Genetic divergence was studied following Mahalanobis’s (1936) generalized distance (D2) extended by Rao (1952). Canonical variate analysis was followed for determining the group constellation and principal component analysis (Rao, 1964) was carried out for graphical representation of the genotypes.

Source of Information: SAARC J. Agri., 7 (2):43-50.2009.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Through the multivariate analysis IR72102-3-107-1-1-2R, IR68445-62-1-3-1R,Gui99R, MH77R, IR44675R, BR736R and IR64680-81-2-2-1-3R were selected due to their greater divergence for the mentioned characters that would offer a good scope to develop an elite restorer line by RxR improvement program for the exploitation of better heterosis with promising CMS line. Genetic diversity was very much important factor for any hybridization program aiming at genetic improvement of yield especially in self pollinated crops. Mahalanobis’s D² statistics was a powerful tool in choosing parents for hybridization aiming at hybrid improvement.

Knowledge Management: Journal