Genetic Diversity of Selected Upland Rice Genotypes (Oryza sativa L.) for Grain Yield and Related Traits

Soil salinity is one of the most devastating environmental stresses for rice production in the coastal areas of Bangladesh. Improvement in salt tolerance of rice is an important way for the economic utilization of coastal zones. An experiment was conducted at the vinyl house of the Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Bangladesh during December 2016 to April 2017 to determine the effects of different salinity levels on the yield and yield components of some rice (Oryza sativa L.) genotype sand finally, screening of rice genotypes for salt tolerance. The experiment containing four treatments was laid out in a complete randomized design with five replications. The treatments were four levels of saline water with electrical conductivities at control (0.3 dSm-1), 5, 10 and 15dSm-1. Based on screening at germination stage, relatively salt-tolerant eleven genotypes with two check varieties were used in this experiment. The study showed that increase in salinity level significantly decreased yield and yield contributing characters of rice. However, among the eleven, three genotypes (Chapali, Patnai 23 and Soloi) were considered as moderately salt tolerant at 15 dSm-1 on the basis of their yields and yield contributing characteristics such as plant height reduction, total tiller reduction, effective tiller reduction, reduction of fertile grains per panicle, grain yield and relative grain yield. Therefore, Chapali, Patnai 23 and Soloi might be recommended as moderately salt tolerant rice genotypes. The Agriculturists 2018; 16(1) 65-77

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Assessment of molecular divergence using microsatellite markers linked to drought-yield QTLs of rice (Oryza sativa L.)

ORYZA- An International Journal on Rice ◽

10.35709/ory.2020.57.2.2 ◽

2020 ◽

Vol 57 (2) ◽

pp. 94-99

Author(s):

ND Rathan ◽

SK Singh ◽

RK Singh ◽

PR Vennela

Keyword(s):

Genetic Diversity ◽

Oryza Sativa ◽

Oryza Sativa L ◽

Polymorphic Marker ◽

Polymorphic Markers ◽

Rainfed Conditions ◽

Transgressive Segregants ◽

Rice Genotypes ◽

Contemporary Study ◽

Selection Of

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 and Population Structure in Upland Rice (Oryza sativa L.) of Mizoram, North East India as Revealed by Morphological, Biochemical and Molecular Markers

Biochemical Genetics ◽

10.1007/s10528-018-09901-1 ◽

2019 ◽

Vol 57 (3) ◽

pp. 421-442 ◽

Cited By ~ 1

Author(s):

Vanlalsanga ◽

Y. Tunginba Singh

Keyword(s):

Genetic Diversity ◽

Population Structure ◽

Oryza Sativa ◽

Molecular Markers ◽

Upland Rice ◽

Oryza Sativa L ◽

North East India ◽

North East

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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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Estimation of combining ability for yield and yield component traits in upland rice (Oryza Sativa L.) of Uttarakhand hills

Journal of Applied and Natural Science ◽

10.31018/jans.v9i1.1204 ◽

2017 ◽

Vol 9 (1) ◽

pp. 406-414

Author(s):

J. P. Aditya ◽

Anuradha Bhartiya

Keyword(s):

Oryza Sativa ◽

Grain Yield ◽

Plant Height ◽

Combining Ability ◽

Upland Rice ◽

Oryza Sativa L ◽

Specific Combining Ability ◽

Kernel Length ◽

Days To Maturity ◽

Additive Gene

Combining ability for grain yield and its component characters in rainfed upland rice (Oryza sativa L.) were studied during Kharif 2014 using half diallel involving ten parents viz., VL Dhan 221, Vivek Dhan 154, VL 30240, VL 7620, VL 30560, VL 8116, VL 8549, VL 8724, VL 8732 and Sukradhan1. Both general combining ability (gca) and specific combining ability (sca) variances were found to be highly significant for the characters viz., plant height (gca=85.42; sca=23.12), days to 50% flowering (gca=101.61; sca=42.61), days to maturity (gca=90.37; sca=37.73), tillers per plant (gca=4.63; sca=1.38), panicle per plant (gca=2.36; sca=0.90),kernel length (gca=28.88; sca=23.61), kernel width (gca=1.64; sca=1.92),1000 grain weight (gca=3.60; sca=4.91), grain yield per plot (gca=8.57; sca=3.03), fertile grains per panicle (gca=690.67; sca=300.95) and grains per panicle (gca=1050.58; sca=437.75) indicating the importance of additive and non-additive gene actions in the expression of these traits. However, predominance of non-additive gene action was recorded for all the characters. Parents VL Dhan 221, VL 7620, VL 30560, Sukradhan 1 were good general combiners for grain yield and related characters. VL Dhan 221 and Vivek Dhan 154 were good general combiners for plant height and earliness. On the basis of specific combining ability effects, cross combinations Vivek Dhan 154 x VL 8549, VL 7620 x VL 30560, VL 8549 x VL 8732, VL 30560 x VL 8116 and VL 30240 x VL 8116 were the best specific combiner for grain yield per plot and other associated characters viz., plant height, days to 50% flowering, days to maturity, kernel length and kernal width.

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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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