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Research Detail

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M. R. Islam
Plant Breeding Division, Bangladesh Rice Research Institute (BRRI), Gazipur-1701, Bangladesh.

M. A. R. Bhuiyan
Plant Breeding Division, Bangladesh Rice Research Institute (BRRI), Gazipur-1701, Bangladesh.

M. A. Islam
Plant Breeding Division, Bangladesh Rice Research Institute (BRRI), Gazipur-1701, Bangladesh.

M. A. Islam
Plant Breeding Division, Bangladesh Rice Research Institute (BRRI), Gazipur-1701, Bangladesh.

Genetic diversity of 26 BRRI released MV and advanced line of rainfed lowland rice varieties were studied through Mahalanobis D2 statistic. The genotypes were grouped into five clusters. The cluster III contained the highest number of genotypes (9) and the cluster I and IV contained the lowest (3). The highest intra cluster distance was noticed for the cluster III and the lowest for cluster IV. The highest inter cluster distance was observed between cluster I and cluster II followed by cluster IV and II, cluster V and cluster I, cluster III and cluster I and the lowest between cluster IV and cluster I. Days to flowering and duration are the most positive contributions based on the latent vectors. But the highest cluster means for yield and other four yield contributing characters were obtained from cluster IV. One highest and four second highest mean for yield and yield contributing characters were also found in cluster I and the lowest cluster mean for yield in cluster II. Therefore more emphasis should be given on cluster IV for selecting genotypes as parents for crossing with the genotypes of cluster II which may produce new recombinants with desired traits.

  Genetic diversity, D2 analysis, Cluster analysis, Rice.
  Bangladesh Rice Research Institute (BRRI) and Chuadanga site.
  01-01-2001
  31-12-2001
  Conservation and Biodiversity
  Rice

To analyze the genetic divergence of 26 rainfed lowland (Transplanted Aman) rice genotypes.

Twenty-six rice genotypes from Bangladesh Rice Research Institute (BRRI) and local sources were grown in the farmer’s field at Chuadanga site in transplanted aman season, 2001. The trial was conducted in Randomized Complete Block (RCB) design with three replications. The experiment was conducted on rainfed situation and no irrigation was applied. Ten plants from each entry were randomly selected for recording data. Data were collected on days to flowering, maturity duration, plant height (cm), panicle length (cm), flag leaf length (cm), number of tiller per hill, number of panicle hill, spikelets per panicle, sterile spikelets per panicle and yield (t/ha). Genetic divercity syudied following Mahalanobis (1936) generalized distance (D2) extended by Rao (1952). Based on the D2 values, the varieties were grouped into clusters following the method suggested by Tocher (Rao, 1952). Intra and inter cluster distances were calculated by the methods of Singh and Chaudhury (1985). Statistical analyses were carried using IBM computer at BRRI, following Genstat programme. Based on cluster the twenty-six genotypes were grouped into five clusters:

Cluster No. Genotypes
I BRRI dhan30, Pajam II, BR6187-38-2-4
II BRRI dhan39, BR5777-11-2-4-1, BR6577-1-2, BR6420-13-1-5, BR6420-13-1-4, BR6390-34-2-2, BR6390-24-1-6
III BRRI dhan33, BR6398-12-2, BR6004-75-4-H7, BR6004-75-4-H2, BR5771-11-7-1-H8, BR6420-48-12-1, BR6420-13-3-2, BR6420-13-1-6, BR6396-1-3-2
IV BR11, BRRI dhan31, BR6128-24-1-3-4
V BR25, BRRI dhan32, Latishail, BR6415-22-3

 

  SAARC JOURNAL OF AGRICULTURE Vol. 1, 2003 ISSN 1682-8348 SAARC Agricultural Information Centre.
  
Funding Source:
1.  Government Budget:  
  

In the present study the maximum distances existed between cluster I and cluster II. But considering the yield and duration, crosses involving cluster II and cluster IV may exhibit high heterosis for earliness and yield. Mian and Bahl (1989) reported that the parents separated by D2 values of medium magnitude generally showed higher heterosis. Keeping this in view, it appears that the crosses between the genotypes/ parents belonging the cluster II with that of cluster IV and cluster I and cluster V would exhibit high heterosis as well as earliness and higher level of production. So based on this result, the genotypes under cluster II and cluster IV and cluster I and cluster V have been selected for future breeding programme.

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