Genetic Diversity in Tomato (Solanum lycopersicum) and Its Wild Relatives

Bauchet, Guillaume; Causse, Mathilde

doi:10.5772/33073

Cited by 93 publications

(92 citation statements)

References 172 publications

(135 reference statements)

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“…As a result, cultivars yielding fruits with various sizes, shapes, and colors and different production techniques were developed [20,21]. With tomato breeding being widely performed, after 1930, the goal of tomato breeding has been primarily yield and productivity followed by disease resistance to maintain production in challenging environment.…”

Section: Discussionmentioning

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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Section: Discussionmentioning

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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“…Wild tomatoes occur over a wide range of ecological and climatic conditions, but individual species and accessions are often adapted to particular microclimates (Bauchet and Causse 2012;Zuriaga et al 2009). The diversity of conditions is expressed at the morphological, physiological, sexual and molecular levels (Bauchet and Causse 2012;Peralta and Spooner 2005).…”

Section: Local Adaptationmentioning

confidence: 99%

“…The diversity of conditions is expressed at the morphological, physiological, sexual and molecular levels (Bauchet and Causse 2012;Peralta and Spooner 2005). We explored whether variation in environment at the sites of origin of accessions has resulted in variation in thermotolerance and found that the mean PV of accessions correlated negatively with elevation.…”

Section: Local Adaptationmentioning

confidence: 99%

Exploring the natural variation for reproductive thermotolerance in wild tomato species

et al. 2018

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Climate change has become a serious threat for crop productivity worldwide. The increased frequency of heat waves strongly affects reproductive success and thus yield for many crop species, implying that breeding for thermotolerant cultivars is critical for food security. Insight into the genetic architecture of reproductive heat tolerance contributes to our fundamental understanding of the stress sensitivity of this process and at the same time may have applied value. In the case of tomato (Solanum lycopersicum), germplasm screenings for thermotolerance have often used yield as the main measured trait. However, due to the complex nature of yield and the relatively narrow genetic variation present in the cultivated germplasm screened, there has been limited progress in understanding the genetic basis of reproductive heat tolerance. Extending the screening to wild accessions of related species that cover a range of climatic conditions might be an effective approach to find novel, more tolerant genetic resources. The purpose of this study was to provide insight into the sensitivity of individual reproductive key traits (i.e. the number of pollen per flower, pollen viability and style protrusion) to heat-wave like long-term mild heat (LTMH), and determine the extent to which genetic variation exists for these traits among wild tomato species. We found that these traits were highly variable among the screened accessions. Although no overall thermotolerant species were identified, several S. pimpinellifolium individuals outperformed the best performing cultivar in terms of pollen viability under LTMH. Furthermore, we reveal that there has been local adaptation of reproductive heat tolerance, as accessions from lower elevations and higher annual temperature are more likely to show high pollen viability under LTMH.

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“…Large tomato germplasm collections have been characterized at the molecular level using simple sequence repeat (Ranc et al, 2008) and single-nucleotide polymorphism (SNP) markers (Blanca et al, 2012;Shirasawa et al, 2013), giving insights into population structure, tomato evolutionary history, and the genetic architecture of traits of agronomic interest. These screens of nucleotide diversity were made possible (for review, see Bauchet and Causse, 2012) in the last couple of years due to the release of the tomato genome sequence (Tomato Genome Consortium, 2012) and derived genomic tools such as a high-density SNP genotyping array . The combination of large germplasm collections, high-throughput genomic tools, and traits of economic interest provide a framework to apply genomewide association study (GWAS) in this species.…”

mentioning

confidence: 99%

Genome-Wide Association in Tomato Reveals 44 Candidate Loci for Fruit Metabolic Traits

Sauvage

Segura

Bauchet³

et al. 2014

Plant Physiology

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196

215

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Genome-wide association studies have been successful in identifying genes involved in polygenic traits and are valuable for crop improvement. Tomato (Solanum lycopersicum) is a major crop and is highly appreciated worldwide for its health value. We used a core collection of 163 tomato accessions composed of S. lycopersicum, S. lycopersicum var cerasiforme, and Solanum pimpinellifolium to map loci controlling variation in fruit metabolites. Fruits were phenotyped for a broad range of metabolites, including amino acids, sugars, and ascorbate. In parallel, the accessions were genotyped with 5,995 single-nucleotide polymorphism markers spread over the whole genome. Genome-wide association analysis was conducted on a large set of metabolic traits that were stable over 2 years using a multilocus mixed model as a general method for mapping complex traits in structured populations and applied to tomato. We detected a total of 44 loci that were significantly associated with a total of 19 traits, including sucrose, ascorbate, malate, and citrate levels. These results not only provide a list of candidate loci to be functionally validated but also a powerful analytical approach for finding genetic variants that can be directly used for crop improvement and deciphering the genetic architecture of complex traits.

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Genetic Diversity in Tomato (Solanum lycopersicum) and Its Wild Relatives

Cited by 93 publications

References 172 publications

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

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

Exploring the natural variation for reproductive thermotolerance in wild tomato species

Genome-Wide Association in Tomato Reveals 44 Candidate Loci for Fruit Metabolic Traits

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