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Genetic diversity analysis in Tomato (Solanum lycopersicum L.)

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Abstract

The genetic diversity among 50 genotypes in tomato showed highly significant differences among the genotypes for all the characters indicating presence of sufficient amount of variability in all the traits. Mahalanobis D2 statistics revealed that considerable genetic diversity within and among nine clusters. The characters viz., fruit weight, number of fruits per plant, root length and plant height were the potent factors in differentiating the germplasm of tomato under this study., In addition to the genetic divergence, considering the mean performance, eleven genotypes for fruit yield from I, II, III and IX clusters, eight genotypes for earliness from II, III, IV, VI, VIII and IX clusters, nine genotypes for root length from I, II, III IV and VII clusters and seven genotypes for RDW/SDW from I, III and VIII clusters were superior and they can be used for future breeding programmes. There was a considerable variation among the genotypes for all the nine qualitative characters.

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... An improvement in yield and quality in self-pollinated crops like tomato is normally achieved by selecting the genotypes with desirable character combinations existing in nature or by hybridization (Nalla et al., 2014). It is very useful technique of measuring genetic divergence as reported by various workers (Kumar et al., 2010;Meena and Bahadur, 2013;Pedapati et al., 2014;Dar et al., 2015;Meena and Bahadur, 2015). Considering the above facts, the present studies had been planned with the objective to assess the extent of genetic diversity in available gene pool based on nineteen quantitative and quality traits.Randomized block design with three replications. ...
... The clustering pattern did not show any relationship between genetic diversity and geographic diversity. These results are in agreement with the early work ofShashikanth et al. (2010);Pedapati et al. (2014); Meena and Bahadur (2015);Dar et al. (2015). So selection of genotypes for hybridization to generate diverse new gene combinations should be based on genetic diversity rather than geographic diversity. ...
... Average inter and intra-cluster distances revealed that, in general, inter cluster distances were higher than those of intra-cluster distances, suggesting homogeneous and heterogeneous nature of the germplasm lines within and between the clusters, respectively. These results are in accordance with the findings ofKumar et al., (2010); Meena and Bahadur (2013);Pedapati et al. (2014)The percentage contribution of 15 characters for genetic divergence (Table 3) showed that fruit length contributed maximum (33.0%) towards genetic divergence followed by ascorbic acid (18.0%), plant height (13.33%), number of seeds/ fruit (11.0%), fruit diameter (10.33%) and fruit pH(6.33%).also observed such maximum contribution for plant height to total divergence of tomato accessions. ...
... The clustering pattern did not show any relationship between genetic diversity and geographic diversity. These results are in agreement with the early work of Shashikanth et al., (2010); Pedapati et al., (2014); Meena and Bahadur (2015); Dar et al., (2015). So, selection of genotypes for hybridization to generate diverse new gene combinations should be based on genetic diversity rather than geographic diversity. ...
... indicating that the genotypes belonging to these groups were genetically most divergent. These results are in accordance with the findings of Kumar et al., (2010); Meena and Bahadur (2013); Pedapati et al., (2014). ...
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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.
... The clustering pattern did not show any relationship between genetic diversity and geographic diversity. These results are in agreement with the early work of Shashikanth et al., (2010); Pedapati et al., (2014); Meena and Bahadur (2015); Dar et al., (2015). So, selection of genotypes for hybridization to generate diverse new gene combinations should be based on genetic diversity rather than geographic diversity. ...
... indicating that the genotypes belonging to these groups were genetically most divergent. These results are in accordance with the findings of Kumar et al., (2010); Meena and Bahadur (2013); Pedapati et al., (2014). ...
Article
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Present investigation was carried out at Vegetable Research Farm, RPCAU, Pusa, Samastipur, Bihar during 2018-19 (Rabi). About thirty genotypes were evaluated for 15 growth, yield and quality characters which were grouped into six clusters. Cluster I topped in having maximum of ten genotypes followed by cluster IV and V with seven genotypes each, cluster II with four genotypes, while cluster III and VI were monotypic (one genotype each). The maximum intra cluster distance was observed in cluster IV (550.48) followed by clusters IV (490.54), cluster II (397.02) and cluster I (379.42) which were identified genetically divergent. The maximum inter cluster distance was noticed between cluster VI and III (7043.88) and lowest between cluster II and I (596.75). The genotypes of cluster VI recorded maximum mean values for number of flower per cluster, fruit per cluster and number of fruits per plant while average fruit weight and fruit yield per plant maximum values were recorded in genotypes belonging to clusters V. Among the fifteen characters studied ascorbic acid content contributed highest divergence followed by average fruit weight have a major role in improvement of fruit yield in tomato.
... The clustering pattern did not show any relationship between genetic diversity and geographic diversity. These results are in agreement with the early work of Shashikanth et al., (2010); Pedapati et al., (2014); Meena and Bahadur (2015); Dar et al., (2015). So, selection of genotypes for hybridization to generate diverse new gene combinations should be based on genetic diversity rather than geographic diversity. ...
... indicating that the genotypes belonging to these groups were genetically most divergent. These results are in accordance with the findings of Kumar et al., (2010); Meena and Bahadur (2013); Pedapati et al., (2014). ...
Article
Full-text available
Present investigation was carried out at Vegetable Research Farm, RPCAU, Pusa, Samastipur, Bihar during 2018-19 (Rabi). About thirty genotypes were evaluated for 15 growth, yield and quality characters which were grouped into six clusters. Cluster I topped in having maximum of ten genotypes followed by cluster IV and V with seven genotypes each, cluster II with four genotypes, while cluster III and VI were monotypic (one genotype each). The maximum intra cluster distance was observed in cluster IV (550.48) followed by clusters IV (490.54), cluster II (397.02) and cluster I (379.42) which were identified genetically divergent. The maximum inter cluster distance was noticed between cluster VI and III (7043.88) and lowest between cluster II and I (596.75). The genotypes of cluster VI recorded maximum mean values for number of flower per cluster, fruit per cluster and number of fruits per plant while average fruit weight and fruit yield per plant maximum values were recorded in genotypes belonging to clusters V. Among the fifteen characters studied ascorbic acid content contributed highest divergence followed by average fruit weight have a major role in improvement of fruit yield in tomato.
... The analysis of the contribution of each character towards the expression of genetic divergence (Table 6) indicated that yield/plant contributed maximum (34.48%) towards genetic divergence followed by plant height (20.78%), number of fruits/plant (11.49%) and days to first picking (11.49%) and average fruit weight (9.09%). , Ara et al. (2009), Reddy et al. (2013) and Pedapati et al. (2014) also observed such maximum contribution of yield/plant, plant height, number of fruits/plant and average fruit weight to total divergence of tomato germplasm. De et al. (1988) opined that traits contributing maximum towards D 2 values needed to be given more emphasis for deciding the clusters to be taken for the purpose of choice of parents for hybridization. ...
Article
Full-text available
Genetic divergence among the 56 genotypes of tomato (Solanum lycopersicum L.) collected from different geographical regions of India, was quantified by Mahalanobis D 2 statistic for 14 quantitative and qualitative traits during the year 2014-15. Analysis of variance indicated that genotypes varied significantly among themselves in respect of 14 characters studied. Based on D 2 analysis using Tocher's method all 56 genotypes were grouped into 10 clusters with a maximum of 13 genotypes in cluster VIII and minimum 1 in cluster III. Maximum inter-cluster distance was observed between cluster IV and VIII (2601.53) followed by cluster III and V (1981.92). Appreciable diversity within and between the clusters was observed. No parallelism was found between geographical and phenotypic diversity. Considering the cluster mean, the genotypes of cluster IV are suitable, both as open-pollinated varieties and as parents to be used in a hybridization programme. The five traits, viz. yield/plant, plant height, number of fruits/ plant, days to first picking and average fruit weight contributed 87.33% to the total divergence and played the greatest role in differentiation of germplasm. These traits can be utilized for improving yield and obtaining good segregants in tomato breeding programs.
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