Phenotypic diversity in Greek tomato (Solanum lycopersicum L.) landraces

Terzopoulos, P.J.; Bebeli, Penelope J.

doi:10.1016/j.scienta.2010.06.022

Cited by 57 publications

(46 citation statements)

References 30 publications

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“…The Mantel test revealed a low correlation between morphological matrices and molecular matrices of the cultivated and wild tomatoes (r = 0.157), which was also reported in Korean tomato varieties (Kwon et al, 2009), Greek tomato landraces (Terzopoulos and Bebeli, 2010), and almond genotypes and related Prunus species (Nikoumanesh et al, 2011). However, a good correlation between genomic-SSR and EST-SSR matrices (r = 0.710) was observed, which further confirms the applicability of EST-SSR markers for analyzing genetic diversity in tomatoes.…”

Section: Discussionmentioning

confidence: 62%

Genetic diversity of cultivated and wild tomatoes revealed by morphological traits and SSR markers

Zhou

Cao

et al. 2015

Genet. Mol. Res.

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ABSTRACT. In the current study, morphological traits and molecular markers were used to assess the genetic diversity of 29 cultivated tomatoes, 14 wild tomatoes and seven introgression lines. The three components of the principal component analysis (PCA) explained 78.54% of the total morphological variation in the 50 tomato genotypes assessed. Based on these morphological traits, a three-dimensional PCA plot separated the 50 genotypes into distinct groups, and a dendrogram divided them into six clusters. Fifteen polymorphic genomic simplesequence repeat (genomic-SSR) and 13 polymorphic expressed sequence tag-derived SSR (EST-SSR) markers amplified 1115 and 780 clear fragments, respectively. Genomic-SSRs detected a total of 64 alleles, with a mean of 4 alleles per primer, while EST-SSRs detected 52 alleles, with a mean of 4 alleles per primer. The polymorphism information content was slightly higher in genomic-SSRs (0.49) than in EST-SSRs (0.45). The mean similarity coefficient among the wild tomatoes was lower than the mean similarity coefficient among the cultivated tomatoes. The dendrogram based on genetic distance 13869 Genetic diversity analysis of cultivated and wild tomatoes ©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 14 (4): 13868-13879 (2015) divided the 50 tomato genotypes into eight clusters. The Mantel test between genomic-SSR and EST-SSR matrices revealed a good correlation, whereas the morphological matrices and the molecular matrices were weakly correlated. We confirm the applicability of EST-SSRs in analyzing genetic diversity among cultivated and wild tomatoes. High variability of the 50 tomato genotypes was observed at the morphological and molecular level, indicating valuable tomato germplasm, especially in the wild tomatoes, which could be used for further genetic studies.

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Section: Discussionmentioning

confidence: 62%

Genetic diversity of cultivated and wild tomatoes revealed by morphological traits and SSR markers

Zhou

Cao

et al. 2015

Genet. Mol. Res.

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“…However, introgression of highly desirable characteristics and higher selection pressure to select those traits in tomato population has decreased the genetic diversity [2]. Phenotypic characteristics have been used to study genetic differences and for genetic diversity analysis and cultivar development [3][4][5][6]. Assessment of diversity in commercial cultivars provides the status of a crop in relation to its wild and domesticated relatives and assists in creating a breeding scheme to bring in the lost alleles due to extreme selection and bottlenecks during domestication or introduction [7].…”

Section: Introductionmentioning

confidence: 99%

Diversity among Modern Tomato Genotypes at Different Levels in Fresh-Market Breeding

Bhattarai

Sharma

Panthee

2018

International Journal of Agronomy

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Cultivated tomato has been in existence for about 400 years and breeding activities have been conducted for only eight decades. However, more than 10,000 tomato cultivars have already been developed. Ninety-one tomato genotypes were characterized for twenty-one morphological traits using developmental, vegetative, and fruit traits. Correlation, principal component, and cluster analysis between the traits were carried out. Higher correlations between fruit traits including fruit shape, fruit size, and fruit types were observed. These correlations indicate that specific fruit types require specific traits like branched inflorescence and a greater number of fruits per inflorescence are beneficial only for smaller fruit sizes like cherry and grape tomatoes. Contrastingly, traits like determinate growth habit and fruit maturity are preferred in all fruit types of tomato for better cultivation practices and longer production duration and hence showed lower correlations. Principal component analysis clustered tomato genotypes into three main clusters with multiple subgroups. Similar tomato genotypes were placed into one or more clusters confirming the results from correlation analysis. Involvement of private breeding programs in cultivar development has increased the competition on introgression of novel and desired traits across new cultivars. Understanding the diversity present in modern cultivars and potential traits identification in related wild species can enhance tomato diversity and improve quality and production.

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“…That would be why heterogeneity even in fruit shapes within the same variety seems to be quite spread. For example, the Greek variety "Santorini" shows different morphologies depending on the use given: rounded for juice and preserves, and flattened fruit for producing sun-dried tomatoes (Terzopoulos and Bebeli, 2010). Similarly, in the case of the Italian traditional variety "A pera Abruzzese" Mazzucato et al (2010) observed predominantly round fruit, but also flattened and obovoid fruit in a considerable number of cases (20 and 24 % respectively).…”

Section: Discussionmentioning

confidence: 99%

Traditional Eastern Spanish varieties of tomato

Cortés-Olmos

Valcárcel

Roselló

et al. 2015

Sci. agric. (Piracicaba, Braz.)

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Despite the importance of traditional varieties of tomato (Solanum lycopersicum L.)as sources of variation in breeding programs and varieties targeted to high-price quality markets that value their exceptional organoleptic quality, little is known regarding the structure of these materials at the morphological level. In this study, a collection of 166 populations (137 of them during two years) of traditional varieties of tomato from the east coast of Spain has been characterized using 41 descriptors. The characterization revealed a considerable variation. The segregation observed in several populations (28 %) suggests that apart from the configuration as population varieties, the high variation present in these landraces may be partially due to possible seed mixing and spontaneous cross-pollination. Only nine fruit descriptors were required to represent the variation present in the collection analyzed. It seems that after spontaneous crosspollinations, farmers applied strong selection to a small number of traits, though even in these traits a high level of variation is maintained. The variation observed may hinder clear recognition by the consumer, an attribute required for the consolidation of quality markets. Additionally, a registry of these materials as conservation varieties would be complicated considering the actual levels of variation. Therefore, a varietal depuration would be interesting in order to promote in situ conservation of these resources. Finally, the high levels of variation in the intra-varietal scale may justify the collection and maintenance of more populations of the same variety as the risk of conserving duplicates would not be so high.Keywords: Solanum lycopersicum, genetic resources, breeding, genebank collection (e.g. the name of the town or county) or to its use (e.g. salad tomato) only. It is therefore necessary to clarify if these designations correspond to specific varieties or if they can be ascribed to a certain existing variety and the general designation in passport data corresponds to inaccurate recording during collections.Several efforts have been made to characterize Spanish materials (Alonso et al., 2009; García-Martínez et al., 2006Casals et al., 2011Casals et al., , 2012 CebollaCornejo et al., 2013). However few of them analyze morphological data, and either they are usually restricted to one or few varieties, or the varieties analyzed have in general ambiguous designations (e.g. Gragera-Facundo et al., 2011).In this context, this study mainly aims to continue previous efforts (Cebolla-Cornejo et al., 2013) to characterize a different set of populations and increase the number of varieties. This considerably large set of populations belonging to traditional varieties typical of the East Coast of Spain will enable a further study that will focus on how they are structured. This information would be of great value in the promotion of on-farm conservation of this diversity as well as to the provision of new information for the management of germplasm banks. Mater...

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Phenotypic diversity in Greek tomato (Solanum lycopersicum L.) landraces

Cited by 57 publications

References 30 publications

Genetic diversity of cultivated and wild tomatoes revealed by morphological traits and SSR markers

Genetic diversity of cultivated and wild tomatoes revealed by morphological traits and SSR markers

Diversity among Modern Tomato Genotypes at Different Levels in Fresh-Market Breeding

Traditional Eastern Spanish varieties of tomato

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