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Genetic Divergence of Aromatic Rice (oryza Sativa L.)

Ratna Rani Majumder
Plant Breeding Division, Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh.

Ripon Kumar Roy
Biotechnology Division, Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh.

MA Khaleque Mian
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh.

Nasrin Akter Ivy
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh.

Abstract/ Executive Summary:

Thirty aromatic rice genotypes were studied to assess the nature and magnitude of genetic divergence among them for grain yield and yield contributing characters. Based on 23 characters the genotypes were grouped into 5 clusters. Inter-distances were higher than intra-cluster showing a wide range of genetic diversity among the genotypes of different groups. The highest level of inter-cluster distance (73.48) was found between cluster IV and V. The highest intra-cluster distance (3.364) was computed to cluster V and the lowest 1.851 was observed in cluster IV. Panicle length, days to initial flower opening, spikelet sterility, pollen fertility and harvest index had maximum contribution towards genetic divergence of 30 aromatic rice genotypes. Genotypes having these characters in the genetically distant cluster could, therefore, offer a significant scope for the development of high yielding variety through judicious selection.

Keywords: Genetic diversity, D2 analysis, Cluster analysis, Rice (Oryza sativa L.)

Location: Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur

Start Date: 00-11-2007

End Date: 00-05-2008

Program Area: Variety and Species

Commodity: Rice

Objectives:

To estimate the nature and magnitude of genetic divergence and the characters contributing to genetic diversity of 30 aromatic rice genotypes.

Methodology:

The experiment containing 30 aromatic rice genotypes was carried out at the experimental farm of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur during November 2007 to May 2008. The experiment was laid out in RCBD with three replications. Two rows of 5 m, each constituted the experimental unit. Healthy seedlings of 37 days old were transplanted in separate strips with 25 cm x 20 cm spacing in the experimental field. The land was prepared thoroughly with proper ploughing followed by laddering to attain a good puddled condition. Fertilizers @ 180-100-70-60 kg/ha urea, TSP, MP and gypsum were applied, respectively. All fertilizers except urea were applied at the final land preparation. Total amount of urea was applied in three installments at 15, 30 and 50 days after transplanting recommended by BRRI (1999). Weeding and other intercultural operation was done as and when necessary. The agronomic data were collected from 10 hills of each genotype. The statistical analysis for various characters under investigation were done and the analysis of variance for each of the characters was performed by F test and mean values were separated by DMRT using MSTATC program. Genetic diversity was worked out following principal component analysis and generalized distance (D²) analysis. Clustering of genotypes was done according to Tochers method. Multivariate analysis viz. principal component analysis, principal coordinate analysis, cluster analysis were performed using GENSTAT 5.5 program.

Source of Information: Bangladesh J. Bot. 44(2): 185-191, 2015 (June).

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Inter-distances were higher than intra-cluster showing a wide range of genetic diversity among the genotypes of different groups. The highest level of inter-cluster distance (73.48) was found between cluster IV and V. The highest intra-cluster distance (3.364) was computed to cluster V and the lowest 1.851 was observed in cluster IV. Panicle length, days to initial flower opening, spikelet sterility, pollen fertility and harvest index had maximum contribution towards genetic divergence of 30 aromatic rice genotypes. Genotypes having these characters in the genetically distant cluster could, therefore, offer a significant scope for the development of high yielding variety through judicious selection.

Knowledge Management: Journal