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M Z Islam
Genetic Resources and Seed Division, BRRI, Gazipur

M Khalequzzaman
Genetic Resources and Seed Division, BRRI, Gazipur

M A Siddique
Genetic Resources and Seed Division, BRRI, Gazipur

N Akter
Genetic Resources and Seed Division, BRRI, Gazipur

M S Ahmed
Genetic Resources and Seed Division, BRRI, Gazipur

M A Z Chowdhury
Member Director (Crops), BARC, Dhaka

Genetic diversity of 30 Jhum rice landraces was studied under irrigated condition through Mahalanobis D2 statistic for agro-morphological characters. The landraces were grouped into five clusters. The inter- cluster distances were higher than intra-cluster distances indicating wider genetic diversity among    the landraces of different clusters. The intra-cluster distances were lower in all the cases reflecting homogeneity of the genotypes within the clusters. The principal component analysis exposed that the first five components with vector values > 1 contributed 81.14% of the total variations. The highest number (8) of landraces was observed in cluster IV and the lowest (4) in cluster II. The intra-cluster distance was maximum in cluster III (1.62) containing six landraces and minimum in cluster I (0.57) having six landraces. The highest inter cluster value was 23.44 (between cluster II and V) and the lowest was 7.29 (between cluster III and IV). The highest flag leaf length, leaf area index, filled grains per panicle were found in cluster V while the lowest culm diameter, short duration, low yielding genotypes were clubbed into cluster II. Dwarf stature and lower flag leaf length were recorded into cluster I whereas the highest plant height and panicle length were obtained from cluster IV. Based on canonical vector analysis, culm diameter, days to flowering, days to maturity and length-breadth ratio had maximum contribution towards genetic divergence. Selection of parents from the clusters II and V followed by hybridization would possibly result in desirable transgressive segregants. Finally, Jhum rice landraces need to be conserved in Genebank for future breeding programme.

 

  Genetic diversity, Jhum rice landraces, Agro-morphological characters
  Rangamati District in Bangladesh
  24-10-2015
  00-07-2016
  Conservation and Biodiversity
  Rice

To study and identify the Phenotypic Characterization of Jhum Rice (Oryza sativa L.) Landraces Collected from Rangamati District in Bangladesh

A total of 30 Jhum rice landraces were collected from Rangamati districts of Bangladesh during 24-28 October, 2015 by Dr M Z Islam and colleagues, Bangladesh Rice Research Institute (BRRI) under Asian Food and Agriculture Cooperation initiative (AFACI) project. All rice landraces were grown under Jhum. Fresh seed stocks for each landrace were collected from fields and farmer’s store. The collected landraces have been conserved at short term storage of the BRRI Genebank. The collected Jhum rice landraces were characterized for agro-morphological traits. These studies were conducted in RCB design with three replications at the experimental field of BRRI, Gazipur, during March to July (Aus season) 2016. Twenty-day-old seedlings from each entry were transplanted using single seedling per hill in 2.4 m2 plot. Row to row and plant to plant distances were maintained as 25 cm and 20 cm, respectively. Fertilizers were applied @ 60:20:40:12 kg N, P, K and S per hectare. All the fertilizers except N were applied at final land preparation. Nitrogen was applied in three equal splits, at 15 days after transplanting (DAT), at 35 DAT and just before flowering. Intercultural operations and pest control measures were done as and when necessary. Twenty-three qualitative traits namely blade pubescence, blade colour, leaf sheath: anthocyanin colour, basal leaf sheath colour, flag leaf angle, ligule colour, ligule shape,  coller colour, auricle colour, culm:anthocianin colouration of nodes, culm angle, internode colour, culm strength, panicle type, panicle exertion, spikelet: awns in the spiklet, distribution of awing, awn colour, apiculus colour, stigma colour, lemma and palea colour, seed coat (bran) colour and leaf senescence were scored based on ‘Descriptors for cultivated rice (Oryza sativa L.)’ issued by GRSD, BRRI (2018). Again, specifically ten plants from each entry were randomly selected for recording data on 15 quantitative traits namely, flag leaf length, flag leaf width, leaf area index, culm diameter, plant height, effective tiller number, panicle length, days to flowering,  days to maturity, filled grains per panicle,  grain length, grain breadth, length-breadth ratio, 1000 grain weight (TGW) and yield per hill. Genetic diversity was worked out by the principal component analysis (Rao, 1964) and Mahalanobis’ generalized distance (D2) analysis (Rao, 1952). Intra and inter cluster distances were calculated by the methods of Singh and Chaudhury (1985). Under multivariate analysis principal component analysis (PCA), principal coordinate analysis (PCoA), cluster analysis (CA) and canonical vector analysis (CVA) were done by using GENSTAT 5.5 programme.

  Bangladesh Rice J. 21 (1) : 47-57, 2017
  
Funding Source:
1.   Budget:  
  

Based on the  results  of  the  current  study,  we made some conclusions as follows: (i)  Jhum rice landraces from Rangamati district showed good diversity  in  both  qualitative  and quantitative agro-morphological traits. Cluster analysis using quantitative traits of landraces grouped them into five clusters. Observed variances in qualitative data were mostly explained by blade pubescence, anthocyanin colour of leaf sheath, apiculus colour, stigma colour, lemma-palea colour, grain tip colour and awning while considering results from genetic distance, the landraces Koborok -2, Chorui, Galong, Bidi, Kamarang-1 and Suri could be selected as parents for further breeding programme. Besides, selection of parents from the clusters II and V may be useful for breeding to obtain desirable transgressive segregants. Moreover, characterizations of the identified landraces need to be done using SSR markers for protection from biopiracy.

  Journal
  


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