Plant Genetic Resources for Food and Agriculture

Ríos, Rodomiro Ortiz

doi:10.1007/978-3-319-20532-8_2

Cited by 2 publications

(5 citation statements)

References 94 publications

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“…Remarkably, few descriptors had high heritability values, with only 10 out of the 36 descriptors having a heritability value above 0.7. This is in contrast with the recommendation that descriptors for germplasm characterization should have high heritability (Ortiz Ríos, 2015). It also suggests that comparisons of data sets corresponding to different trials, in particular, when environmental conditions are very dissimilar should be made with caution, unless only descriptors with high heritability or low genotype × environment contribution to the observed variation are used.…”

Section: Discussionmentioning

confidence: 83%

“…Our work is the first, to our knowledge, to evaluate the stability of tomato descriptors in characterization trials from different cultivation environments. Amazingly, despite the importance of characterization data for breeding and germplasm management (Engels and Visser, 2002;Ortiz Ríos, 2015), there is little information on the stability of tomato descriptors and the influence this may have in comparison of data sets from different trials and environments.…”

Section: Discussionmentioning

confidence: 99%

“…Ideally, descriptors should have high heritability and, in consequence, the cultivation environment and genotype × environment interaction should have a low influence in the expression of the trait scored (Ortiz Ríos, 2015). This would allow direct comparisons among characterization data sets.…”

Section: Discussionmentioning

confidence: 99%

“…Depending on the trait, descriptors are metric, meristic, measured according to an arbitrary quantitative scale, or assigned to qualitative states (Grum and Atieno, 2007). Ideally, standardized descriptors should display a wide variation in the collections of materials characterized, as well as having a high heritability (Ortiz Ríos, 2015), which in turn requires a low environmental influence. Descriptors having these characteristics are highly informative.…”

Section: Introductionmentioning

confidence: 99%

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Variation of morphological descriptors for the evaluation of tomato germplasm and their stability across different growing conditions

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Prohens

Casanova

et al. 2018

Scientia Horticulturae

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Germplasm and breeding materials are usually characterized using morphological and agronomic descriptors, which should have a high heritability. Despite the widespread use of tomato (Solanum lycopersicum) standardized descriptors, little information exists on environmental effects on descriptor values and their heritability. We have evaluated 12 tomato accessions from seven cultivar groups in three different environments (openfield conventional, open-field organic, and greenhouse) and characterized them with 36 descriptors. A wide range of variation was found for most descriptors, demonstrating their utility for describing tomato materials and their diversity and relationships. The analysis of descriptors variation reveals that while for some descriptors with a simple genetic control the accession effect accounts for 100% of the variation, for others like yield per plant only 10.83% of the variation observed is due to the accession effect. Although significant differences were found among environments for most descriptors, including a much higher yield in the open-field conventional environment than in the two others, the environmental effect was low for most traits. However, the genotype × environment effect generally had an important contribution to the structure of variation for many descriptors, and for three traits it had the highest contribution to the percentage of the sum of squares. As a result of the variation structure, the heritability values are high (>0.7) for only 10 descriptors, while for five is low (<0.3). Principal components analysis (PCA) reveals that projections in the PCA graph of a same accession grown in different environments plot together in the same area of the PCA graph. Although cultivar groups are generally clearly separated in the PCA graph, 2 accessions from the same cultivar group in some cases are intermixed. These results have important implications for detecting tomato duplicates and establishing core collections, as well as for analyzing germplasm and breeding results, when using data sets containing data of accessions grown in different environments.

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Section: Discussionmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Variation of morphological descriptors for the evaluation of tomato germplasm and their stability across different growing conditions

Figàs

Prohens

Casanova

et al. 2018

Scientia Horticulturae

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“…The aim of the present work was to provide information for the phenotypic diversity and potential utilization of a collection of tomato landraces grown in Greece. The collection, consisted of 33 landraces, eight modern varieties and two commercial hybrids, was investigated by using several economically important traits, in particular, those related to fruit yield, fruit morphology and fruit quality, to determine if such characteristics could be useful to detect valuable materials for breeders and growers (Ortiz Ríos, 2015). Results support the notion that some of these traits can be efficiently used in evaluating and discriminating cultivars, highlighting the extensive diversity across the collection.…”

Section: Discussionmentioning

confidence: 85%

Exploring morpho-physiological profiles of a collection of tomato (Solanum lycopersicum) germplasm using multivariate statistics

Krommydas

Nianiou-Obeidat

Ouzounidou³

et al. 2020

Plant Genet. Resour.

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A selection of tomato (Solanum lycopersicum L.) genotypes with diverse origin and breeding history including 33 landraces, eight modern varieties and two commercial hybrids has been characterized using a set of 25 qualitative descriptors and six quantitative traits. A wide range of variation was evident for the majority of traits, highlighting their utility for characterizing tomato germplasm collections. A plethora of qualitative traits including type of leaf blade, depression and ribbing at peduncle end, fruit shape at blossom end, number of locules and flowering time, as well as measured traits with economic importance such as fruit fresh weight, firmness and total yield per plant, were found to be highly variable within the collection, with a diversity index greater than 0.8. Strong correlations were detected among several traits related to fruit yield and quality. Two-dimensional principal component analysis as well as the unsupervised hierarchical clustering grouped genotypes according to their phenotypic resemblance and morphological characteristics to a great extent. Landraces from different origins were scattered across the whole variation spectrum of PC1 and PC2. A set of six qualitative traits could efficiently discriminate cultivars in PCA (explaining 75% of total variation), suggesting that it can serve as a valuable breeding tool for the germplasm characterization. The evaluation of the phenotypic diversity in the collection as well as the identification of traits that contribute most to heterogeneity have important implications for establishing core collections with high diversity, as well as designing breeding schemes across the Mediterranean basin.

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Plant Genetic Resources for Food and Agriculture

Cited by 2 publications

References 94 publications

Variation of morphological descriptors for the evaluation of tomato germplasm and their stability across different growing conditions

Variation of morphological descriptors for the evaluation of tomato germplasm and their stability across different growing conditions

Exploring morpho-physiological profiles of a collection of tomato (Solanum lycopersicum) germplasm using multivariate statistics

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