Evaluation of Genetic Diversity in Agromorphological Traits of Forty Two Aman Rice Genotypes (Oryza sativa L.) Using D2 Analysis

The drought stress is the major limitation for the production and yield stability in the rice (Oryza sativa L.) growing areas particularly under rainfed conditions. The assessment of genetic diversity among the rice genotypes using molecular markers linked to drought-yield QTLs will help in the selection of divergent parents to produce superior recombinants and transgressive segregants to develop high yielding cultivars for drought conditions. So the current study was conducted to estimate the genetic diversity among the set of twenty four advanced drought tolerent rice genotypes and commercial checks using SSR markers linked to major drought-yield QTLs. A total of 31 alleles were detected by 13 polymorphic markers across 24 rice genotypes with a mean of 1.94 alleles per polymorphic marker. Among the polymorphic markers, 11 markers formed 2 alleles each, 2 markers have produced 3 alleles each. The PIC value observed in the contemporary study ranged from 0.239 to 0.499 with an average PIC value of 0.346. The dendrogram displayed a total five clusters on the basis of dissimilarity coefficient values, the cluster II had maximum ten genotypes followed by cluster IB-a with five genotypes and clusters IA-a, IA-b, IB-b with three genotypes each. IR 82475-110-2-2-1-2 and IR92937-178-2-2 (R-155) were found to be the most divergent genotypes.

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Genetic Diversity in Aus rice (Oryza sativa L.) Genotypes of Bangladesh

Bangladesh Journal of Agricultural Research ◽

10.3329/bjar.v43i2.37329 ◽

2018 ◽

Vol 43 (2) ◽

pp. 253-266

Author(s):

N Akter ◽

H Begum ◽

MZ Islam ◽

MA Siddique ◽

M Khalequzzaman

Keyword(s):

Genetic Diversity ◽

Oryza Sativa ◽

Genetic Distance ◽

Oryza Sativa L ◽

Mean Value ◽

Tiller Number ◽

Cluster Distance ◽

Transgressive Segregants ◽

Rice Genotypes ◽

High Genetic Distance

Genetic diversity in 31 traditional Bangladeshi Aus rice genotypes were studied under transplanted condition through Mahalanobis D2 statistic for grain yield and yield contributing characters. The genotypes were grouped into five clusters. The inter-cluster distances were higher than intra-cluster distances indicating wider genetic diversity among the genotypes of different clusters. The intra-cluster distances were lower in all the cases reflecting homogeneity of the genotypes within the clusters. The cluster II contained the highest number of genotypes (08) and the cluster I and III contained the lowest (05). The highest intra-cluster distance was noticed for the cluster II and the lowest for cluster IV. The highest inter-cluster distance was observed between cluster II and V followed by cluster III and V, cluster I and V and the lowest between cluster I and III. Regarding inter-cluster distance, the genotypes of cluster V showed high genetic distance from all other clusters. The genotypes from cluster V could be hybridized with the genotypes of other characters of other clusters for producing transgressive segregants. The highest cluster means for yield, effective tiller number and grain length, were obtained from cluster I; whereas the lowest mean value for yield, culm length, plant height and grain breadth were found in cluster II. Therefore, genotypes under cluster I, cluster II and cluster V might be selected for future breeding program as parents for crossing to produce new recombinants with desired traits.Bangladesh J. Agril. Res. 43(2): 253-266, June 2018

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GENETIC DIVERSITY AND PARENTS SELECTION FROM EXOTIC RICE (Oryza sativa L.) GERMPLASM

Bangladesh Journal of Plant Breeding and Genetics ◽

10.3329/bjpbg.v25i1.17007 ◽

2012 ◽

Vol 25 (1) ◽

pp. 11-16

Author(s):

A. A. Mamun ◽

N. A. Ivy ◽

M. G. Rasul ◽

M. M. Hossain

Keyword(s):

Genetic Diversity ◽

Principal Component Analysis ◽

Cluster Analysis ◽

Oryza Sativa ◽

Oryza Sativa L ◽

Principal Component ◽

Component Analysis ◽

Rice Genotypes ◽

Total Divergence ◽

Five Axes

Genetic divergence among fifty exotic rice genotypes along with two check varieties were estimated using D2 and principal component analysis. The study was undertaken to select suitable donor parents for use in improved breeding program of Bangabandhu Sheikh Mujibur Rahman Agricultural University in 2009. Principal component analysis (PCA) revealed that the first five axes accounted for 58.10% of the total variation. As per cluster analysis, the genotypes were grouped into seven clusters consisting 11, 16, 7, 11, 1, 2 and 4 genotypes which revealed that there exist considerable diversity among the genotypes. Considering the magnitude of genetic distance, contribution of different characters towards the total divergence and magnitude of cluster means for different characters, the genotypes RG-BU-08-057, 61, 65, 67, 69, 71, 85, 86, 88, 94, 96, 98 and 99 might be selected as a suitable parent for future hybridization program.DOI: http://dx.doi.org/10.3329/bjpbg.v25i1.17007

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Multivariate approach to analyse genetic diversity in some basmati rice genotypes (Oryza sativa L.)

Electronic Journal of Plant Breeding ◽

10.5958/0975-928x.2017.00039.4 ◽

2017 ◽

Vol 8 (1) ◽

pp. 269

Author(s):

C.R. Allam ◽

A. Qamar ◽

Jay Prakash ◽

H.K. Jaiswal

Keyword(s):

Genetic Diversity ◽

Oryza Sativa ◽

Oryza Sativa L ◽

Basmati Rice ◽

Multivariate Approach ◽

Rice Genotypes

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GENETIC DIVERSITY OF BALAM AND JESSO-BALAM RICE (Oryza sativa L.) GERMPLASM OF BANGLADESH REVEALED BY SSR MARKERS

Bangladesh Journal of Plant Breeding and Genetics ◽

10.3329/bjpbg.v27i2.27847 ◽

2016 ◽

Vol 27 (2) ◽

pp. 17-24

Author(s):

M. S. Ahmed ◽

M. Khalequzzaman ◽

M. K. Bashar ◽

A. K. M. Shamsuddin

Keyword(s):

Genetic Diversity ◽

Oryza Sativa ◽

Genetic Distance ◽

Ssr Markers ◽

Oryza Sativa L ◽

Gene Diversity ◽

Clustering Method ◽

Land Races ◽

Rice Genotypes

A total of 72 rice genotypes including Balam (40), Jesso-Balam (27) rice land races and popular varieties (5) from Bangladesh were characterized using 45 SSR markers for studying genetic diversity and identification of duplicate germplasm. Altogether 430 alleles were detected which varied from 4 to 18 per locus with an average of 9.6. The highest number of alleles (18) was found in the locus RM302. The highest gene diversity (0.91) was found in RM337 and RM224, while the lowest (0.52) was found in RM237. The PIC values ranged from 0.90 to 0.46 with an average of 0.78. The highest PIC value was observed in loci RM337 and RM224 followed by 0.89 in RM55, RM258, RM21 and RM206, respectively. The gene diversity and PIC values revealed that RM337, RM224, RM55, RM258, RM21 and RM206 were the best markers to identify and distinguish the genotypes. Besides, the UPGMA clustering method generated seven clusters, where no duplicate genotype was found. It also showed that Balam and Jesso-Balam groups of germplasm were constellated into separate clusters. The Neis genetic distance ranged from 0.3556 to 1.0. Conserved, characterization and utilization of the unique and distinct variability of all the similar or duplicate named land races of Balam and Jesso-Balam rice is suggested.

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Molecular Marker Based Genetic Diversity Analysis in Rice Genotypes (Oryza sativa L.) using SSR Markers

International Journal of Pure & Applied Bioscience ◽

10.18782/2320-7051.2892 ◽

2017 ◽

Vol 5 (2) ◽

pp. 668-674 ◽

Cited By ~ 6

Author(s):

K. N. Krupa ◽

Keyword(s):

Genetic Diversity ◽

Oryza Sativa ◽

Molecular Marker ◽

Ssr Markers ◽

Oryza Sativa L ◽

Diversity Analysis ◽

Genetic Diversity Analysis ◽

Rice Genotypes

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Genetic Diversity of Boro Rice (Oryza sativa L.) Landraces in Bangladesh

Bangladesh Journal of Plant Breeding and Genetics ◽

10.3329/bjpbg.v29i2.33948 ◽

2016 ◽

Vol 29 (2) ◽

pp. 33-40 ◽

Cited By ~ 1

Author(s):

N. Akter ◽

M. Z. Islam ◽

M. A. Siddique ◽

T. Chakrabarty ◽

M. Khalequzzaman ◽

...

Keyword(s):

Genetic Diversity ◽

Oryza Sativa ◽

Oryza Sativa L ◽

Flag Leaf ◽

Growth Duration ◽

Cluster Distance ◽

Transgressive Segregants ◽

Rice Genotypes ◽

1000 Grain Weight ◽

Boro Rice

Genetic diversity of 45 traditional Bangladeshi boro rice genotypes was studied through Mahalanobis D2 statistics and was grouped into six clusters. The inter-cluster distances were higher than intra-cluster distances indicating wider genetic diversity among the genotypes of different clusters. The intra-cluster distances were lower in all the cases reflecting homogeneity of the genotypes within the cluster. The cluster V contained the highest number of genotypes (14) and the cluster I and VI contained the lowest (4) number. The highest intra-cluster distance was noticed for the cluster VI and the lowest for cluster V. The highest inter-cluster distance was observed between cluster I and VI followed by cluster II and VI, cluster I and V and the lowest between cluster II and IV. The genotypes from cluster VI could be selected as parents for hybridization for producing transgressive segregants. The highest cluster means for yield, grains per panicle and grain length-breath ratio were obtained from cluster I; whereas higher yield, grain breath, 1000 grain weight, flag leaf area, shortest growth duration were obtained from cluster V. Therefore, more emphasis should be given on cluster I, cluster V and cluster VI for selecting genotypes as parents to produce new recombinants with desired traits.

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