scholarly journals Nature and Magnitude of Genetic Divergence among Blackgram [Vigna mungo (L.) Hepper] Genotypes

2021 ◽  
Author(s):  
Sidramappa . ◽  
P.H. Kuchanur ◽  
M. Shobharani ◽  
B. Arunkumar ◽  
S.A. Kulkarni ◽  
...  
Keyword(s):  
Genetic Divergence ◽  
Reproductive Period ◽  
Breeding Programme ◽  
Lattice Design ◽  
Relative Contribution ◽  
High Magnitude ◽  
Cluster Distance ◽  
Viii And Ix ◽  
Different Sources ◽  
High Seed Yield

Background: The choice of parents is a very crucial step which decides the success or failure of any plant breeding programme. Using the diversity analysis, parents with high diversity can be chosen to generate high magnitude of useful variability. Therefore, the present investigation was planned to assess the genetic divergence among 100 genotypes of blackgram for identification of diverse genotypes for their utilization in breeding programme.Methods: The material for study consisted of 100 blackgram genotypes collected from different sources and were evaluated at ARS, Bidar during kharif-2018. The experimental trial was laid out in lattice design (10×10) with two replications. Observations on 12 quantitative characters. The genetic divergence was assessed by using Mahalanobis’ generalized distance (D2) and clustering of genotypes by Tocher’s method.Result: The relative contribution of each character to the total diversity was different and contribution of days to maturity was maximum (66.04%) followed by reproductive period (15.86%). The genotypes were grouped into nine clusters by Tocher’s method. The cluster pattern revealed that, cluster II was the largest with 28 genotypes followed by cluster I (26), V (19), III (11), IV (10) and VII (3) and remaining viz., VI, VIII and IX were solitary clusters. The inter-cluster distance ranged from 15.50 to 514.44 indicating high magnitude of diversity. The genotypes belonging to cluster III viz., BDU-20, BDU-3-20, BDU-68, TRCRU-22 possessed desirable traits like earliness and higher seed size and genotypes of cluster IV viz., BDU-9, BDU-10, LBG-752 possessed traits like higher reproductive period, maturity and high seed yield were identified as diverse. These genotypes could be involved in recombination breeding programme for the improvement productivity in blackgram.

scholarly journals Genetic Diversity In Exotic Maize (Zea mays L.) Hybrids

2013 ◽  
Vol 38 (2) ◽  
pp. 335-341 ◽  
Author(s):  
MA Zaman ◽  
MA Islam
Keyword(s):  
Plant Height ◽  
Genetic Divergence ◽  
Agricultural Research ◽  
Research Station ◽  
Early Maturity ◽  
Mean Values ◽  
Maize Hybrids ◽  
Lattice Design ◽  
Cluster Distance ◽  
The Mean

An experiment in alpha lattice design with three replication including 39 exotic maize hybrids was conducted at the Research farm of Regional Agricultural Research Station, BARI, Ishuardi, Pabna during Rabi season 2010-11 for analysis the genetic divergence in exotic maize hybrids. The genotypes were grouped in to seven clusters. Cluster VI comprised the maximum genotypes (13) indicating overall genetic similarity among them. The minimum genotype (1) was contained in the cluster III and V. The highest inter-cluster distance was observed between cluster V and III followed by cluster I and III and cluster III and VII suggesting wide diversity between them and the genotypes in these cluster could be used in hybridization program for obtaining a wide spectrum of variation among the segregates. The highest intra-cluster distance was observed in cluster VII and the cluster III and V were contained only one genotype and hence, their intra cluster distance was zero. The mean values of cluster IV recorded the highest yield per hectare (11.60 ton/ha) with medium plant height, days to maturity, days to 50% tasseling, silking and shelling percentage. Selection on the basis of plant aspect and ear aspect the genotypes of cluster III ranked first but plant height was high with medium seed size, medium yield, medium shelling percentage and also in late in case of maturity. The mean values of cluster V shown overall medium in case of yield and all yield contributing characters. Qualitative characters contribute maximum towards genetic divergence. Therefore, the genotypes from cluster III, V and VI could be utilized as source materials for getting desirable new recombinants with early maturity and higher yield. Bangladesh J. Agril. Res. 38(2): 335-341, June 2013 DOI: http://dx.doi.org/10.3329/bjar.v38i2.15894

scholarly journals Genetic Divergence In Potato (Solanum Tuberosum L.)

1970 ◽  
Vol 36 (1) ◽  
pp. 165-172
Author(s):  
MA Sattar ◽  
MZ Uddin ◽  
MR Islam ◽  
MKR Bhuiyan ◽  
MS Rahman
Keyword(s):  
Cluster Analysis ◽  
Multivariate Analysis ◽  
Solanum Tuberosum ◽  
Geographic Distribution ◽  
Genetic Divergence ◽  
Tuber Yield ◽  
Average Weight ◽  
Cluster Distance ◽  
Total Divergence ◽  
Different Sources

Twenty eight genotypes of potato representing different sources collected from TCRC, BARI, Gazipur were tested for genetic divergence utilizing multivariate analysis. The genotypes were grouped into five clusters. No relationship was found between genetic divergence and geographic distribution. Number of tubers per plant and yield contributed maximum, while average weight of a tuber and weight of tubers per plant contributed high towards total divergence which offered due attention to these characters while selecting for increased tuber yield. The inter-cluster distance (D2) was maximum (36.29) between III and IV. The highest and the lowest intracluster distances (D2) were 9.64 and 2.48 in cluster III and II, respectively.   Keywords: Potato; selection; genetic divergence; cluster analysis; tuber yield. DOI: http://dx.doi.org/10.3329/bjar.v36i1.9240 BJAR 2011; 36(1): 165-172

scholarly journals Studies On Genetic Divergence In Maize (Zea mays) Inbreds

2013 ◽  
Vol 38 (1) ◽  
pp. 71-76 ◽  
Author(s):  
AA Khan ◽  
MR Islam ◽  
KU Ahmed ◽  
ABM Khaldun
Keyword(s):  
Genetic Divergence ◽  
Agricultural Research ◽  
Inbred Lines ◽  
Research Station ◽  
Growth Duration ◽  
Lattice Design ◽  
Single Genotype ◽  
Cluster Distance ◽  
Ear Height ◽  
1000 Grain Weight

Genetic divergence in 17 CIMMYT Maize inbred lines including one check were assessed based on some morphological traits and grain yield using Mahalanobis’ D2-statistics. The experiment was carried out in alpha lattice design with two replications at Regional Agricultural Research Station, Ishurdi Pabna during the winter 2010-2011. The genotypes were grouped into four clusters. The cluster II contained the highest number of lines (6), while the cluster I contained only single genotype. The maximum inter-cluster distance was noticed between the cluster I and IV and minimum between cluster I and II. The highest intra-cluster distance was observed in the cluster IV and lowest in cluster I. The genotypes in the cluster III showed better performances having shorter growth duration, short stature, shortest ear height, better shelling percentage and reasonable yielding ability. It is expected that crossing of inbred lines belonging high to medium D2 values may tend to produce high heterosis for yield. Ear aspect had the greatest contribution to the genetic divergence. Days to pollen shedding, silking, maturity, and 1000-grain weight were found to be responsible for primary differentiation. Bangladesh J. Agril. Res. 38(1): 71-76, March 2013 DOI: http://dx.doi.org/10.3329/bjar.v38i1.15191

Genetic divergence in Yam bean (Pachyrhizus erosus L. Urban) Germplasm

2018 ◽  
Vol 5 (04) ◽  
Author(s):  
ASHISH NARAYAN ◽  
DEEP SHIKHA ◽  
NILANJAYA . ◽  
RS SINGH ◽  
RABINDRA PRASAD
Keyword(s):  
Genetic Divergence ◽  
Tuber Yield ◽  
Genetic Distances ◽  
Tuber Weight ◽  
Yield Improvement ◽  
High Magnitude ◽  
Pachyrhizus Erosus ◽  
Maximum Contribution ◽  
Cluster Distance ◽  
Total Divergence

Altogether, 30 germplasm of Yam bean including two released varieties viz., Rajendra Misrikand-1(RM-1) and Rajendra Misrikand-2 (RM-2) were analyzed for genetic divergence among twelve studied characters. Analysis of variance revealed highly significant differences among the genotypes for all the twelve characters under study. The (PCV) was greater than genotypic coefficient of variance (GCV) for all the characters and high magnitude of PCV and GCV were observed for traits like tuber weight followed by tuber yield indicating that these traits could be used for tuber yield improvement but wide difference between GCV and PCV were recorded for most of the traits except for the tuber yield and tuber weight. All the thirty genotypes were grouped into 6 clusters using D2 statistics. Highest inter cluster distance was observed between cluster I and III (107.53) followed by cluster III and VI (97.61) and cluster I and II (78.54) on the basis of their genetic distances. Tuber yield followed by tuber weight and seed yield were having maximum contribution towards total divergence.

Evaluation of genetic divergence in Barley (Hordeum vulgare L.) germplasms

2016 ◽  
Vol 1 (01) ◽  
pp. 9-14
Author(s):  
Rajendra Kumar ◽  
Ravi Kumar ◽  
Neeraj Kumar ◽  
Nathi Ram
Keyword(s):  
Hordeum Vulgare ◽  
Genetic Divergence ◽  
Harvest Index ◽  
Breeding Programme ◽  
Path Coefficient ◽  
Index Number ◽  
Hordeum Vulgare L ◽  
Cluster Distance ◽  
Biological Yield ◽  
Positive Direct

Thirty genotypes of wheat were evaluated for assessing genetic divergence among eleven different characters across one environment for exploitation in a breeding programme for improving yield of barley by using Mahalanobis D2 statistics. The germplasms were grouped into six clusters. Out of six clusters, cluster I had five genotypes, cluster II had two genotypes, cluster III had ten genotypes, cluster IV had two genotypes, cluster V had eight genotypes and cluster VI had three genotypes based on present investigation. The intra cluster distance among various clusters exhibited maximum intra cluster distance for cluster VI and lowest was recorded for cluster II. The maximum inter cluster distance was revealed between cluster I and V followed by cluster I and VI, cluster III and IV, cluster III and VI , cluster II and IV, cluster III and V and cluster II and V. The least inter cluster distance between clusters IV and VI followed by cluster IV and I and cluster I and II cluster. The phenotypic and genotypic path coefficient exhibited high positive direct contribution of harvest index, number of tillers per plant, number grain per spike and biological yield per plant.

scholarly journals Genetic divergence and its implication in breeding of desired plant type in coriander -Coriandrum sativum L.-

Genetika ◽  
2005 ◽  
Vol 37 (2) ◽  
pp. 155-163 ◽  
Author(s):  
S.P. Singh ◽  
R.S. Katiyar ◽  
S.K. Rai ◽  
S.M. Tripathi ◽  
J.P. Srivastva
Keyword(s):  
Genetic Divergence ◽  
Genetic Architecture ◽  
Geographical Origin ◽  
Canonical Analysis ◽  
Coriandrum Sativum ◽  
Plant Type ◽  
Mean Values ◽  
Cluster Distance ◽  
Component Traits ◽  
Viii And Ix

Seventy germplasm lines of coriander (Coriandrum sativum L.) of diverse eco-geographical origin were undertaken in present investigation to determine the genetic divergence following multivariate and canonical analysis for seed yield and its 9 component traits. The 70 genotypes were grouped into 9 clusters depending upon the genetic architecture of genotypes and characters uniformity and confirmed by canonical analysis. Seventy percent of total genotypes (49/70) were grouped in 4 clusters (V, VI, VIII and IX), while apparent diversity was noticed for 30 percent genotypes (21/70) that diverged into 5 clusters (I, II, III, FV, and VII). The maximum inter cluster distance was between I and IV (96.20) followed by III and IV (91.13) and I and VII (87.15). The cluster VI was very unique having genotypes of high mean values for most of the component traits. The cluster VII had highest seeds/umbel (35.3 ? 2.24), and leaves/plant (12.93 ? 0.55), earliest flowering (65.05 ? 1.30) and moderately high mean values for other characters. Considering high mean and inter cluster distance breeding plan has been discussed to select desirable plant types.

scholarly journals Genetic Diversity Studies in Mungbean (Vigna radiata L. Wilczek) Germplasm

2021 ◽  
Vol 10 (11) ◽  
pp. 56-66
Author(s):  
Reshmi Jahan Mohammed L. Prasanthi ◽  
Lakshminarayana R. Vemireddy
Keyword(s):  
Genetic Diversity ◽  
Disease Resistance ◽  
Seed Yield ◽  
Genetic Divergence ◽  
Vigna Radiata ◽  
Yield Performance ◽  
Cluster Distance ◽  
Diversity Studies ◽  
High Seed Yield

An investigation was carried out to estimate the genetic divergence for twenty characters in 50 genotypes of greengram [Vigna radiata (L.) Wilczek] using Mahalanobis's D2 statistic and total of eight clusters were formed. The highest number of genotypes were found in cluster II containing sixteen genotypes followed by cluster I with thirteen genotypes, cluster IV with ten genotypes, cluster VI with five genotypes, cluster VIII with three genotypes and clusters III, V and VII with only one genotype. Highest intra-cluster distance was observed for cluster IV (87.54) and lowest intra cluster distance was observed for clusters III, V and VII. The highest inter-cluster distance was observed between cluster IV and VIII (285.11),while the lowest inter cluster distance was observed between cluster VI and VII (251.29). Among the characters studied, phenols content contributed the maximum (32.57 %) towards the diversity. The genotypes present in the clusters V (COGG-13-19) and VII (LGG-544) showed high seed yield performance so, cross obtained between these genotypes will give better performance for yield. The genotypes in the cluster VI (GGG-1, GGG-1-1, IPM-2-14, WGG-42, EC-396117) and cluster III (AGG-35) exhibited resistance to YMV. Hence, the crosses among cluster V, VII, VI and III would give high seed yield along with YMV disease resistance.

Genetic divergence in Indian mustard (Brassica juncea L. Czern. & Coss.

2021 ◽  
Vol 50 (1) ◽  
pp. 37-44
Author(s):  
Nupur Malviya ◽  
K Kumar ◽  
DK Upadhyay
Keyword(s):  
Brassica Juncea ◽  
Genetic Divergence ◽  
Indian Mustard ◽  
Cluster Distance ◽  
Parental Lines

Genetic divergence was carried out in 15 Indian mustard varieties/strains, 4 testers and 60 F1s developed by crossing 15 lines with 4 testers. Based on D2 values between the pair of genotypes, 19 parental lines were grouped into five clusters in E1 (timely sown) & E2 (late sown) condition. In E1, cluster II was the largest having 8 genotypes followed by cluster I and IV with four genotypes. Whereas, in E2 cluster I was largest having 9 genotypes followed by cluster V which had four genotypes. In E1 the intra-cluster distance ranged from 0.00 (cluster V) to 581.64 (cluster IV). Cluster IV and V were the most diverse with inter-cluster distance of 7169.70 followed by cluster II and V (4829.11). Whereas, in E2 the intra-cluster distance ranged from 0.00 (cluster IV) to 296.03 (cluster V). Clusters IV and V were the most diverse with inter-cluster distance of 1894.16. The 60 F1s were grouped into eight clusters in E1 and E2. In E1, the maximum number of genotypes were grouped in clusters I and VI (12) and the intra-cluster distance ranged from 111.59 to 318.07. The maximum inter-cluster distance was observed between cluster IV and VIII (3554.76). Whereas, in E2 maximum number of genotypes grouped in cluster III (15) and intra-cluster distance ranged from 0.00 to 351.31. The maximum inter-cluster distance (D2) was observed between cluster V and VIII (43829.30).

scholarly journals Genetic divergence in bitter gourd (Momordica charntia L.)

2013 ◽  
Vol 38 (2) ◽  
pp. 125-134
Author(s):  
BC Kundu ◽  
MM Hossain ◽  
MA Khaleque Mian ◽  
IH Mian
Keyword(s):  
Genetic Divergence ◽  
Seed Weight ◽  
Male Flower ◽  
Bitter Gourd ◽  
Flower Opening ◽  
Green Fruit ◽  
Fruit Maturity ◽  
Cluster Distance ◽  
Geographical Position ◽  
Seed Width

The genetic divergence among 36 genotypes of bitter gourd (Momordica charantia L.) was determined through PCA, PCO, CVA, Cluster analysis (CLSA) and Mohalanobis’s D2 analysis. Through multivariate analysis based on 22 characters 36 genotypes were grouped into six distant clusters. Cluster VI includes maximum genotypes (12) followed by cluster I (6) and cluster II (6). Cluster V, cluster III and cluster I comprised 5, 4 and 3 genotypes respectively. The inter-cluster distances were higher than the intra-cluster distances. The inter-cluster distance was maximum between cluster III and IV (28.71) followed by the distance between cluster I and cluster IV (23.61). The intra-cluster distances in all the 6 clusters were more or less low indicating the closeness of genotypes within the same cluster. The highest intra-cluster distance was observed for cluster III (1.84) followed by the cluster I (1.38). The genotypes within the same clusters were collected from different places and genotypes collected in the same place fall in different cluster, which indicated that genetic divergence are not dependent on its geographical position from where the genotypes were collected. The genetic diversity of 36 genotypes was also assessed through PCA. The first three components accounted for 60.04% of the total variation. Days to first male flower opening, number of primary branches per vine, fruit yield per vine, days to green fruit maturity, seed weight per fruit mature seed width had the highest contribution towards the divergence. Cluster diagram exhibited that the genotypes include in the cluster III were far diverse from the genotypes of cluster IV while the genotypes belonging to the cluster II and VI were least diversed. DOI: http://dx.doi.org/10.3329/jasbs.v38i2.15593 J. Asiat. Soc. Bangladesh, Sci. 38(2): 125-134, December 2012 J. Asiat. Soc. Bangladesh, Sci. 38(2): 125-134, December 2012

scholarly journals Adaptation to a latitudinal thermal gradient within a widespread copepod species: the contributions of genetic divergence and phenotypic plasticity

2017 ◽  
Vol 284 (1853) ◽  
pp. 20170236 ◽  
Author(s):  
Ricardo J. Pereira ◽  
Matthew C. Sasaki ◽  
Ronald S. Burton
Keyword(s):  
Phenotypic Plasticity ◽  
Genetic Divergence ◽  
Thermal Tolerance ◽  
Large Scale ◽  
Thermal Adaptation ◽  
Common Garden ◽  
Latitudinal Gradients ◽  
Physiological Limits ◽  
Relative Contribution ◽  
Common Garden Experiments

Understanding how populations adapt to heterogeneous thermal regimes is essential for comprehending how latitudinal gradients in species diversification are formed, and how taxa will respond to ongoing climate change. Adaptation can occur by innate genetic factors, by phenotypic plasticity, or by a combination of both mechanisms. Yet, the relative contribution of such mechanisms to large-scale latitudinal gradients of thermal tolerance across conspecific populations remains unclear. We examine thermal performance in 11 populations of the intertidal copepod Tigriopus californicus , ranging from Baja California Sur (Mexico) to British Columbia (Canada). Common garden experiments show that survivorship to acute heat-stress differs between populations (by up to 3.8°C in LD 50 values), reflecting a strong genetic thermal adaptation. Using a split-brood experiment with two rearing temperatures, we also show that developmental phenotypic plasticity is beneficial to thermal tolerance (by up to 1.3°C), and that this effect differs across populations. Although genetic divergence in heat tolerance strongly correlates with latitude and temperature, differences in the plastic response do not. In the context of climate warming, our results confirm the general prediction that low-latitude populations are most susceptible to local extinction because genetic adaptation has placed physiological limits closer to current environmental maxima, but our results also contradict the prediction that phenotypic plasticity is constrained at lower latitudes.

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