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Genectic Variability in Some Maintainer Lines of Hybrid Rice (oryza Sativa L)

A. Ansari
Plant Breeding Division Bangladesh Rice Research Institute Joydebpur, Gazipur

M. G. Rasul
Plant Breeding Division Bangladesh Rice Research Institute Joydebpur, Gazipur

P. L . Biswas
Plant Breeding Division Bangladesh Rice Research Institute Joydebpur, Gazipur

A. K. Paul
Plant Breeding Division Bangladesh Rice Research Institute Joydebpur, Gazipur

M. H. Rahman
Plant Breeding Division Bangladesh Rice Research Institute Joydebpur, Gazipur

Abstract/ Executive Summary:

Twelve maintainer lines of rice were evaluated for 19 agronomic characters in a randomized complete block design to study the genetic divergence through multivariate analysis. Genotypes were grouped into three different clusters. Cluster I comprised maximum number of genotypes (ten) and II and III contain only single genotype each. PCA showed 70.29% variation against first three eigen values. The highest inter genotypic distance was observed between the genotype BRRI 1B and IR 73328B (2.278) followed by BRRI 3B and IR 68890B (2.229) and the lowest distance was observed (0.752) between genotypes BRRI 10B and IR 78355B followed by the distance (0.920) between genotypes BRRI 3B and IR 58025B. The inter cluster distance was larger than the intra cluster distances. The highest inter-cluster distance was observed between cluster II and III (7.113). The lowest inter-cluster distance was observed between cluster I and II (4.445) followed by cluster I and III (4.509). The inter cluster distances were higher than the intra cluster distances suggesting wider genetic diversity among the genotype of different groups. Among the characters anther length (0.00651), stigma length (0.00150), days to maturity (0.03018), number of tillers per hill (0.07890) and panicle weight (0.12713) were major characters that contribute to the genetic divergence.

Keywords: Rice, Maintainer line, Genotype, Genetic divergence

Location: BRRI, Gazipur

Start Date: 00-07-2008

End Date: 00-12-2008

Program Area: Variety and Species

Commodity: Rice

Objectives:

To classify the available genotype into distinct clusters on the basis of their genetic diversity.

Methodology:

Twelve maintainer lines were grown in a randomized complete block design with three replications at the experimental farm of Bangladesh Rice Research Institute, Gazipur during July to December 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. Three rows constituted of each experimental unit (2m²). Adequate soil fertility was ensured by applying additional quantities of Urea- TSP-MP- Gypsum- ZnSO₄ @ 150:100:70:60:10 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. Twenty one (21) days old seedlings of maintainer lines were transplanted in separate strips with spacing of 20 cm x 20 cm spacing between plant to plant and row to row, respectively were maintained. Necessary intercultural operation was taken during cropping period for proper growth and development of the plants. Data were collected from 10 randomly selected hills of each genotype on individual plant basis for plant height, number of tillers per hill, number of panicles per hill, flag leaf area, anther length, anther breadth, stigma length, stigma breadth, stigma exertion rate, panicle exertion rate, days to flowering, days to maturity, phenotypic acceptability at vegetative and maturity stage. Genetic diversity was studied following the Mohalanobis’s generalized distance (D²) method extended by Rao (1952). Clustering of genotypes was done according to Tocher’s Method (Rao, 1952) and principle component analysis was according to Jager et al. (1983). The statistical analyses were done by the GENSTAT computer based software.

Source of Information: Bangladesh J. Pl. Breed. Genet., 23(2): 35-40, 2010

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Cluster I comprised maximum number of genotypes (ten) and II and III contain only single genotype each. PCA showed 70.29% variation against first three eigen values. The highest inter genotypic distance was observed between the genotype BRRI 1B and IR 73328B (2.278) followed by BRRI 3B and IR 68890B (2.229) and the lowest distance was observed (0.752) between genotypes BRRI 10B and IR 78355B followed by the distance (0.920) between genotypes BRRI 3B and IR 58025B. The inter cluster distance was larger than the intra cluster distances. The highest inter-cluster distance was observed between cluster II and III (7.113). The lowest inter-cluster distance was observed between cluster I and II (4.445) followed by cluster I and III (4.509). The inter cluster distances were higher than the intra cluster distances suggesting wider genetic diversity among the genotype of different groups. Among the characters anther length (0.00651), stigma length (0.00150), days to maturity (0.03018), number of tillers per hill (0.07890) and panicle weight (0.12713) were major characters that contribute to the genetic divergence.

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