Tocher‘s method of clustering

Genetic diversity among 30 advanced breeding lines of groundnut were estimated using Mahalanobis D2 statistic for 21 characters. The analysis of variance revealed significant differences among the advanced breeding lines for all characters. Based on Tocher's method, 30 advanced breeding lines were grouped into ten clusters.

7p chauchaungayxua12 29-07-2021 13 1   Download

The present experiment was carried out using 51 genotypes at Vegetable Research Centre of G. B. P. U. A & T., Pantnagar, during kharif season of 2019. Mahalanobis D2 statistics was worked out using 11 quantitative characters to assess the degree of genetic divergence. On the basis of value generated using Tocher’s method, 51 genotypes were grouped into six clusters. Cluster I is largest with 42 genotypes followed by clusterII and III with 3 genotypes and cluster IV, V and VI containing 1 genotype in each.

7p chauchaungayxua11 23-03-2021 13 2   Download

The present investigation was therefore, undertaken to assess the nature and magnitude of genetic diversity available in the genotypes of okra on the basis of various growth, earliness and yield attributes.

10p cothumenhmong9 18-01-2021 7 2   Download

The present study was conducted during kharif, 2018 to evaluate 38 genotypes of mungbean [Vigna radiata (L.) Wilczek]with 12 different traits using general statistics, character association, principal component analysis and cluster analysis. The basic descriptive statistics had showed considerable variance for all the traits...

11p nguaconbaynhay7 15-08-2020 10 1   Download

Fourty genotypes of fenugreek were grown at College Farm, N. M. College of Agriculture, Navsari Agricultural University, Navsari during Rabi 2015-16. Grouping of the genotypes was carried-out by following Tocher's method (Rao, 1952). The D2 analysis indicated presence of ample genetic diversity among the genotypes studied, which were grouped into 6 clusters. The maximum inter-cluster distance was observed between cluster-VI and V followed by cluster-VI and V. The minimum inter-cluster distance was depicted between cluster-V and IV.

6p quenchua6 15-06-2020 8 1   Download

Genetic divergence among forty four genotypes of paprika was assessed using Mahalanobis D2 statistic for twenty characters at Horticultural Research Station, Lam, Guntur, Andhra Pradesh. The analysis of variance revealed significant differences among the genotypes for all the characters studied indicating considerable diversity in the material. Based on Mahalanobis D2 statistic, the forty four genotypes were grouped into 6 clusters.

17p cothumenhmong5 17-05-2020 18 2   Download

Fifty-six diverse genotypes of cucumber collected from different indigenous sources were planted in randomized block design, during kharif season at Kittur Rani Chennamma College of Horticulture, Arabhavi, Belagavi district (Karnataka), India. Genetic diversity study using Mahalanobis’s D2 statistics with Tocher’s method, 56 cucumber genotypes were grouped into ten clusters, cluster I was the largest having 26 genotypes followed by cluster III (10 genotypes) followed by cluster II (six genotypes).

9p angicungduoc4 04-05-2020 32 0   Download

In the present investigation thirty two sunflower (Helianthus annuus L.) genotypes including two checks were evaluated to study genetic divergence. The experiment was laid out at Research Farm, Tirhut College of Agriculture, Dholi, Bihar during spring 2015-16. Data were recorded on eleven quantitative characters. The thirty two genotypes of sunflower were grouped into six cluster using Tocher method.

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An experiment on Indian mustard (Brassica juncea L. Czern and Coss), for divergence studies under rainfed condition, was conducted in Randomized Complete Block Design (RBCD) accommodating 50 genotypes, from various Rapeseed and Mustard centres located across country, randomly in three replications during Rabi 2015-16 at the research farm of Tirhut College of Agriculture, Dholi, Muzaffarpur. Analysis of variance revealed considerably exploitable variability for all the 25 traits.

13p trinhthamhodang1212 06-04-2020 15 1   Download

An experiment with thirty three genotypes of bread wheat carried out to study the nature and magnitude of divergence using Mahalanobis D2 statistics, in randomized block design with three replications. The data for thirteen important quantitative traits were recorded from the genotypes raised.

9p quenchua4 06-04-2020 14 2   Download

The present experimental work was carried out at Rice Breeding Section, Pusa, Samastipur, with twenty-two lowland genotypes which were shown in R.B.D. style and were analysed for genetic divergence with the help of Mahalanobis’s D 2 statistics.Twentytwo genotypes of rice were grouped into six clusters using Tocher’s method. The cluster I consists of maximum number of genotypes forming the largest cluster followed by cluster VI having three genotypes.

7p chauchaungayxua4 18-03-2020 10 2   Download

Studies on genetic divergence in sugarcane plant and ratoon crops involving sixteen genotypes planted at RAU Pusa Farm, Samastipur, Bihar during 2012-13 and their consecutive ratoon during 2013-14 under low land area with water-stagnation 2 to 3 months to select profitable genotypes tolerant to water logging. Cane yield of plant crop was higher than the ratoon while for juice quality traits of ratoon crop showed better.

18p caygaocaolon3 09-03-2020 9 1   Download

Hundred foxtail millet genetic resources were studied to assess the magnitude of genetic diversity for 18 metric traits using Mahalanobis D2 Statistic (Tocher’s method). The results of the study showed that the genotypes were grouped into 11 distinct non-overlapping clusters suggesting availability of substantial genetic diversity.

10p cothumenhmong3 22-02-2020 19 0   Download

The present experiment was carried out using twenty-nine elite breeding lines from Station Yield Trial - Slender Grain materials along with three check varieties at the Rice Research Station, O.U.A.T., Bhubaneswar in kharif- 2016. A part of the research was to study the genetic divergence among the breeding lines used in the experiment. The D2 values obtained from the divergence study ranged from 3.36 between OR2675-6-4 and OR2676-2-5 to 2518 between OR2675-2-1 and Samba mahsuri.

8p nguathienthan3 27-02-2020 14 0   Download

An experiment with seventy genotypes of bread wheat carried out to study the nature and magnitude of divergence using Mahalanobis D2 statistics, in randomized block design with three replications. The data for twelve important quantitative traits were recorded from the genotypes raised. High genotypic and phenotypic coefficient of variation were observed for grain weight per main spike followed by biological yield per plant, grain yield per plant, 1000 grain weight, harvest index, number of productive tillers per plant and number of grains per main spike.

6p chauchaungayxua3 07-02-2020 16 1   Download

The present investigation aimed to study genetic divergence and clustering pattern of 37super-early pigeon pea genotypes. Analysis of variance and hierarchical cluster analysis of tocher’s method revealed significant differences among the genotypes for all the traits under study. Based on genetic distance (D2 value), the 37 genotypes were grouped into 9 distinctive clusters, of which cluster I and II formed the largest clusters with 10 genotypes in each. Among all the characters understudy, leaf area index(LAI) at 60 DAS contributed more to the divergence followed by leaf area (17.

12p nguaconbaynhay3 07-02-2020 16 0   Download

The present investigation was carried out with 32 diverse genotypes of bread wheat in completely randomized block design with 3 replications at Norman E. Borlaug Crop Research Centre, G.B. Pant University of agriculture & Technology Pantnagar for screening the genetic diversity for yield and physiological traits under normal sown condition. The observations were recorded on 16 agronomic traits and 3 physiological traits. The statistical analysis for genetic divergence was done using Mahalanobis-D 2 statistics and clustering of genotypes was done using Tocher method.

10p cothumenhmong1 11-12-2019 13 0   Download