scholarly journals Genetic divergence in tomato lines (Solanum lycopersicum L.)

2016 ◽  
Vol 13 (1) ◽  
pp. 61-64
Author(s):  
MZ Ullah ◽  
L Hassan ◽  
T Singha ◽  
AK Patwary
Keyword(s):  
Solanum Lycopersicum ◽  
Plant Height ◽  
Geographical Distribution ◽  
Genetic Divergence ◽  
Fruit Weight ◽  
Solanum Lycopersicum L ◽  
Cluster Distance ◽  
The Mean ◽  
Clustering Pattern

Twenty genotypes of tomato were assessed for their genetic divergence using Mahalanobis D2statistics. Based on D2 values of eleven yield related characters, genotypes were grouped in to five clusters. Maximum genotypes were grouped in cluster II (6) followed by cluster IV (5) the remaining 9 genotypes were distributed in three clusters, four in cluster III, three in cluster I and two genotypes in cluster V. Clustering pattern indicated that there was no association between geographical distribution of genotypes and genetic divergence. The mean intra and inter cluster distance (D) revealed that cluster I had highest intra cluster distance (0.979), while the inter cluster distance was maximum between cluster III and I (13.546) followed by III and V (11.218). The characters like plant height, fruit weight, fruits per plant contributed maximum to genetic divergence.J. Bangladesh Agril. Univ. 13(1): 61-64, June 2015

Genetic divergence analysis of yield and its contributing traits in tall field Pea (Pisum sativum L.)

2017 ◽  
Vol 2 (01) ◽  
pp. 60-63
Author(s):  
V. P. Rahul ◽  
Bharat Bhushan ◽  
Ravi Kumar ◽  
Ram Krishna
Keyword(s):  
Pisum Sativum ◽  
Geographical Distribution ◽  
Genetic Divergence ◽  
Block Design ◽  
Field Pea ◽  
Pisum Sativum L ◽  
Randomized Block Design ◽  
Cluster Distance ◽  
Superior Genotypes ◽  
Clustering Pattern

The experimental material consisting of forty advance genotypes including two checks (Rachna and Shikha) was evaluated in Randomized Block Design with three replications for eleven characters by using Mahalanobis’s D2 statistic. The clustering pattern of genotypes showed no definite relationship between genetic divergence and geographical distribution of genotypes. The genotypes were grouped into seven clusters. The maximum ten lines were put cluster IV, it had maximum intra-cluster distance while inter-cluster distance was highest between I and II. Cluster means indicated that none of the clusters was superior for all the characters studies; however hybridization between genotypes belonging to different cluster (viz. Ist and IInd) is suggested for development of superior genotypes in field pea.

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 Evaluation of Tomato (Solanum lycopersicum L.) Genotypes for Horticultural Characteristics on the Upland in Southern Sierra Leone

2017 ◽  
Vol 9 (6) ◽  
pp. 213
Author(s):  
Salia M. Kanneh ◽  
Dan D. Quee ◽  
Patrick M. Ngegba ◽  
Peter D. Musa
Keyword(s):  
Solanum Lycopersicum ◽  
Sierra Leone ◽  
Plant Height ◽  
Block Design ◽  
Fruit Weight ◽  
Fruit Length ◽  
Fruit Flesh ◽  
Solanum Lycopersicum L ◽  
Locule Number ◽  
Days To Maturity

Notwithstanding the importance of tomato in human diet, the average yield of the crop in Africa hardily exceeds 7.5 tha-1. There is continuous unavailability of high yielding cultivars that are adapted to diverse environment and suitable for different purposes. Consequently, evaluation of introduced tomato genotypes for desired horticultural characteristics to identify superior genotypes for additional improvement in yield and yield related traits is indispensible. Hence eight tomato (Solanum lycopersicum L.) genotypes including parental were field planted in a randomized complete block design with three replications at the Department of Horticulture Nursery Unit, School of Natural resources Management, Njala University, Njala Campus, Moyamba District, Southern Sierra Leone to evaluate them for good horticultural traits. Data collected include plant height at 50% and 100% flowering, stem girth at 50% and 100% flowering, days to first, 50% and 100% flowering, days to maturity, number of fruits set per plant, number of fruits harvested per plant, average fruit weights, fruit length, fruit diameter, fruit flesh thickness, locule number, marketable and nonmarketable fruits per plant. Results from the study indicated that all genotypes studied are adaptable to the Sierra Leone climatic conditions. P1 (097) recorded the highest number of fruits set per plant, number of fruits harvested per plant and tallest and largest plant height and stem girth at 100% flowering. BC2F2 had the highest locule number while R3P9 had the heaviest fruit weight. P2 (213) had the thickest fruit flesh thickness and longest duration to fruit maturity respectively while P1 (097), BC1F2 and R3P9 had the same number of shortest days to maturity. Regarding fruit length and diameter, R3P8 and R6P6 had the longest and widest. With respects to marketable and nonmarketable fruit per plant, P1 (097) recorded the highest correspondingly.

scholarly journals Assessment of Genetic Divergence in Mutant Lines of Tomato (Solanum lycopersicum L.)

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Sunday Clement Makinde ◽  
Regland Onyemeka
Keyword(s):  
Genetic Variability ◽  
Solanum Lycopersicum ◽  
Sodium Azide ◽  
Genetic Divergence ◽  
Block Design ◽  
Mutation Breeding ◽  
Fruit Weight ◽  
Solanum Lycopersicum L ◽  
Qualitative Characters ◽  
Mutant Lines

Introduction: Mutation breeding is the process of exposing seeds to chemicals or radiation in order to generate mutants with desirable traits. Aim: This study is aimed at assessing the genetic variability among mutant lines of tomato (Solanum lycopersicum L.) generated from a variety of tomato (Roma VF) using two different chemo-mutagens. Materials and Method: The collected seeds were exposed to different concentrations of Sodium azide and Colchicine with varied period of exposure. The seeds were planted and selected 49 positive mutant lines were assessed for morphological genetic variability and yield. 18 mutant lines that produced fruits were tagged and selected. The fruits of the selected mutants were harvested and the seeds (M2 seeds) were subsequently planted for divergence analysis. Ten quantitative characters and twenty qualitative characters were scored using IPGRI standard tomato descriptor. The potted experiment was laid out in the Green House, using Randomized Block Design (RBD) with three replications. Result: The results of this study revealed a high genetic divergence among the mutant lines in both quantitative and qualitative characters. There was significant LSD (0.05) for Germination percentage (7.66), Plant height at maturity (7.05) and Number of leaves at maturity (4.56). The yield (fresh fruit weight) varied significantly, ranging from 10.00g for LeMT29 to 319.70g for LeMT7 respectively. Fruit and plant qualitative characters equally exhibit variation. Conclusion: These observations suggest the existence of genetic variability among the different mutant tomato lines. Further selection and field trials is recommended to identify suitable and desirable lines for possible variety release. To Keywords: Mutant, Tomato, Colchicine, Sodium azide, genetic variability.

scholarly journals Genetic Diversity In Mango (Mangifera Indica L.) Through Multivariate Analysis

2013 ◽  
Vol 38 (2) ◽  
pp. 343-353 ◽  
Author(s):  
DAN Majumder ◽  
L Hassan ◽  
MA Rahim ◽  
MA Kabir
Keyword(s):  
Genetic Divergence ◽  
Mangifera Indica ◽  
Principal Component ◽  
Morphological Characters ◽  
Genetic Distances ◽  
Fruit Weight ◽  
Eigen Values ◽  
Cluster Distance ◽  
Clustering Pattern ◽  
Single Cluster

The genetic divergence was assessed in 60 mango genotypes through D2- statistics and principal component analysis. The genotypes under study were grouped into eight clusters and the diversity was influenced by the morphological characters, not by the geographical distribution of the genotypes. The clustering pattern revealed that the genotypes collected from the same region did not fall in the single cluster. The maximum inter cluster distance was noticed between cluster II and cluster VIII, and the lowest between clusters VII and cluster VIII. From the cluster means, cluster I was high yielding and ranked first in terms of number of secondary branches per inflorescence, percent fruit set per inflorescence, and yield per plant. Cluster VIII had only one genotype which produced the highest percentage of flowering shoots, % perfect flowers, number of fruits per plant, and %TSS. The genotypes of cluster VII produced the biggest sized fruits. The first nine characters of the principal component axes with eigen values above unity accounted for 88.3% of the total variation among the fifteen characters. Weight of harvested fruits per plant (0.990 and 0.181), number of fruits per plant (0.101 and 0.607) and individual fruit weight (0.027 and 0.107) for both the vectors were positive across two axes indicating the important components of genetic divergence. The genotypes belonging to clusters I, VII and VIII with high to moderate genetic distances might be recommended for use in crossing programs to produce new recombinants with desired traits. Bangladesh J. Agril. Res. 38(2): 343-353, June 2013 DOI: http://dx.doi.org/10.3329/bjar.v38i2.15895

scholarly journals Studies on Genetic Divergence for Yield and Quality Traits in Cucumber (Cucumis sativus L.)

2020 ◽  
pp. 136-143
Author(s):  
Om Prakash Kumawat ◽  
Udit Kumar ◽  
Satish Kumar Singh ◽  
Sooraj Maurya ◽  
Sooraj Maurya ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Shelf Life ◽  
Genetic Divergence ◽  
Female Flower ◽  
Fruit Weight ◽  
Cucumis Sativus L ◽  
Node Number ◽  
Cluster Distance ◽  
Clustering Pattern ◽  
Number Of Seeds

Genetic divergence analysis, using Mahalanobis D2 statistics, was carried out in twenty one cucumber genotypes including one check for fourteen characters. All the characters under study showed considerable divergence and the genotypes were grouped into four clusters. The clustering pattern had no parallelism between genetic diversity and geographical distribution, suggesting that the selection of parental genotypes for hybridization will be more appropriate based on genetic diversity. Cluster III contained the maximum (5) number of genotypes, whereas remaining all clusters I, II and IV contained similar (4) genotypes. The Intra-cluster distance was maximum (306.685) in cluster III whereas, it was minimum (163.11) in cluster II. Maximum average inter-cluster distance (1439.432) was recorded between cluster IV and cluster V, suggesting the greater chances of getting superior hybrids in F1 or transgressive segregants in subsequent generations. Genotypes in cluster IV were superior in node number of first female flower, days to first flowering, shelf-life, TSS, fruit length, fruit weight and fruit yield per plant. Cluster V had superiority in terms of vine length and number of seeds per fruit. Fruit weight, TSS, number of seeds per fruit, node number of first female flower, shelf-life, days to first harvest and days to first flowering contributed towards genetic divergence.

scholarly journals Assessment of genetic divergence for quantitative traits in thermo tolerant tomato (Solanum lycopersicum L.) genotypes

2018 ◽  
Vol 10 (1) ◽  
pp. 55-58
Author(s):  
Manish Kumar ◽  
R. K. Yadav ◽  
T. K. Behera ◽  
Akshay Talukdar ◽  
Manpreet Kour
Keyword(s):  
Principal Component Analysis ◽  
Solanum Lycopersicum ◽  
Quantitative Traits ◽  
Principal Component ◽  
Component Analysis ◽  
Fruit Weight ◽  
Solanum Lycopersicum L ◽  
Wide Range ◽  
Cluster Distance ◽  
Heat Tolerant

In the present study, 21 thermo tolerant tomato (Solanum lycopersicum L.) genotypes were evaluated to delineate the extent of genetic diversity through 10 quantitative traits. The genotypes were categorized into 4 distinct clusters using D2 statistics. Cluster IV had the maximum number (10) of genotypes, where all heat tolerant genotypes grouped together, followed by cluster I (5). Intra cluster analysis revealed that the cluster IV had highest distance, while the inter cluster distance was maximum between cluster III and cluster IV (6.53) indicating the presence of wide range of variability among genotypes of the cluster. Cluster IV recorded maximum cluster mean for yield (579.0), average fruit weight (33.33) and fruit set per cent (54.8) and the cluster III recorded highest mean value for days to 50 percent flowering (67.33). Principal component analysis showed that the first two principal components (PC’s) accounting for 77.6 per cent of total variation. On the basis of inter cluster distance, cluster mean and principal component analysis observed in the present study, a crossing programme involving genotypes from cluster IV will be promising one for developing heat tolerant tomato hybrids.

scholarly journals Assessment of Genetic Diversity in Morphological Traits of Mango Genotypes Using D2 Statistics

2021 ◽  
pp. 31-42
Author(s):  
Swosti S. Das ◽  
K. Kishore ◽  
D. Lenka ◽  
D. K. Dash ◽  
K. C. Samal ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Genetic Divergence ◽  
Morphological Traits ◽  
Fruit Weight ◽  
Tropical Region ◽  
Wide Range ◽  
Cluster Distance ◽  
Breeding Programmes ◽  
Clustering Pattern ◽  
Hybridization Programme

An experiment was conducted during 2018-2020 to study the genetic diversity in 24 morphological traits using D2 statistics in mango genotypes of eastern tropical region of India. Present study reveals that the clustering pattern based on D2 statistics grouped 40 genotypes of mango into 7 clusters, out of which cluster VI (7397.45) shows the highest intracluster value followed by cluster III (5346.99) and cluster V (4130.4), indicating considerable genetic divergence among the accessions of this cluster. While maximum inter- cluster distance was observed between the cluster VI and VII (300180) followed by cluster II and VI (289267.7) and cluster I and VI (214380.5) indicated that the accessions belonging to these groups were genetically most diverse and can be used as a parent in hybridization programme. Wide range of genetic diversity observed among cluster VI and cluster VII, can either be utilized for breeding programmes for genetic improvement in mango or directly adopted as a variety. Fruit yield exhibited significant contribution towards the genetic divergence (60.77%) followed by fruit weight (26.79%), stone percentage (4.74%), peel percentage (2.31%) and pulp percentage (2.05%).

scholarly journals Genetic variability and trait relationship in cherry tomato (Solanum lycopersicum L. var. cerasiforme (Dunnal) A. Gray)

2013 ◽  
Vol 41 (2) ◽  
pp. 163-167 ◽  
Author(s):  
MS Islam ◽  
HC Mohanta ◽  
MR Ismail ◽  
MY Rafii ◽  
MA Malek
Keyword(s):  
Genetic Variability ◽  
Solanum Lycopersicum ◽  
Fruit Weight ◽  
Fruit Yield ◽  
High Yield ◽  
Genetic Advance ◽  
Cherry Tomato ◽  
Solanum Lycopersicum L ◽  
Wide Range ◽  
Additive Gene

Nine traits of 11 cherry tomato (Solanum lycopersicum L.) var. cerasiforme (Dunal) A. Gray) inbred lines exhibited a wide range of genetic variability. High geno- and phenotypic coefficients of variation were obtained for individual fruit weight (68.16 and 74.23%, respectively) followed by number of fruits/plant (58.8 and 68.34%, respectively). High estimates of heritability, genetic advance and genotypic coefficient of variation for the traits of individual fruit weight, number of fruits and clusters/plant were controlled by additive gene action indicating the possibility of selection to improve these characters. Fruit yield/plant showed low heritability along with low genetic advance and did not show significant and positive correlation with the remaining characters. It indicates that improvement of high yield through selection is difficult, rather hybridization can be effective for improving the fruit yield/plant. Among the lines, CH154 produced the highest number of fruits/plant (291) and highest fruit yield (1.89 kg/plant and 63.4 t/ha) and can be selected for cultivation under Bangladesh condition. DOI: http://dx.doi.org/10.3329/bjb.v41i2.13443 Bangladesh J. Bot. 41(2): 163-167, 2012 (December)

scholarly journals GENETIC DIVERGENCE ANALYSIS IN HRDC RICE (Oryza sativa L.) HYBRIDS IN BANGLADESH

2016 ◽  
Vol 27 (2) ◽  
pp. 25-32
Author(s):  
A. Ahmed ◽  
S. G. Shaon ◽  
M. S. Islam ◽  
P. S. Saha ◽  
M. M. Islam
Keyword(s):  
Genetic Divergence ◽  
Oryza Sativa L ◽  
Principal Component ◽  
Dry Season ◽  
Spikelet Fertility ◽  
Mean Values ◽  
Panicle Number ◽  
Cluster Distance ◽  
The Mean ◽  
Yield Maximization

Genetic divergence of 48 IRRI developed F1 rice hybrids were studied through Mahalanobis D2 and principal component analysis for ten characters in Gazipur and Pabna district during dry season 2012-13. Among 48 genotypes, cluster analysis resulted in five clusters following Ward’s method. During dry season for both regions, cluster I incorporated the highest number of genotypes. Significant differences among the genotypes but non-significant differences among replications were noticed for most of the parameters under study. The inter-cluster distance was larger than intra-cluster distance suggesting wider diversity among the genotypes. In Gazipur, the maximum inter-cluster D2 value was recorded between cluster III and V (6.69) and the minimum between cluster II and IV (0.69). The intra-cluster distance was maximum in cluster IV (3.60) and minimum in cluster I (0.33). In Pabna, maximum inter-cluster distance was exhibited between cluster IV and II (16.43) but minimum between cluster II and III (3.98). Maximum intra-cluster distance (4.40) was recorded in cluster IV whereas minimum in cluster I (0.83). Based on positive value of vector 1 and vector 2, panicle number m-2, spikelet fertility (%) and 1000-grain wt. (g) had maximum contribution towards genetic divergence among the characters studied. Cluster means indicated considerable differences in the mean values of different parameters. The highest cluster means for panicle weight (g), spikelet fertility (%), 1000 grain wt. (g) and grain yield (kg ha-1) were derived from cluster IV. Therefore, more prominence should be given to the lines under cluster IV that having genetic potentiality to contribute better for yield maximization of hybrid rice.

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