Genetic Resources of Watermelon

Levi, Amnon; Jarret, Robert L.; Kousik, Shaker; Wechter, W. Patrick; Nimmakayala, Padma; Reddy, Umesh K.

doi:10.1007/7397_2016_34

Cited by 42 publications

(36 citation statements)

References 104 publications

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“…In addition, the number of watermelon accessions utilized for breeding was very low compared to the number of accessions available because of their seed conditions such as low germination rate or seed volume. Levi et al mentioned that the assembly and conservation of genetically and morphologically diverse watermelon germplasm are essential activities to ensure the current and future success of watermelon breeding programs [45]. Watermelon germplasm collections rich in genetic and phenotypic diversity are maintained in USDA/ARS, Turkey, China, and Southern Africa [45].…”

Section: Discussionmentioning

confidence: 99%

Genetic Diversity Assessed by Genotyping by Sequencing (GBS) in Watermelon Germplasm

Lee

Raveendar

et al. 2019

Genes

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Watermelon is an economically important vegetable fruit worldwide. The objective of this study was to conduct a genetic diversity of 68 watermelon accessions using single nucleotide polymorphisms (SNPs). Genotyping by sequencing (GBS) was used to discover SNPs and assess genetic diversity and population structure using STRUCTURE and discriminant analysis of principal components (DAPC) in watermelon accessions. Two groups of watermelons were used: 1) highly utilized 41 watermelon accessions at the National Agrobiodiversity Center (NAC) at the Rural Development Administration in South Korea; and 2) 27 Korean commercial watermelons. Results revealed the presence of four clusters within the populations differentiated principally based on seed companies. In addition, there was higher genetic differentiation among commercial watermelons of each company. It is hypothesized that the results obtained from this study would contribute towards the expansion of this crop as well as providing data about genetic diversity, which would be useful for the preservation of genetic resources or for future breeding programs.

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Section: Discussionmentioning

confidence: 99%

Genetic Diversity Assessed by Genotyping by Sequencing (GBS) in Watermelon Germplasm

Lee

Raveendar

et al. 2019

Genes

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“…Unlike C. lanatus , C. mucosospermus is primarily cultivated for oil‐rich seeds. Citrullus mucosospermus and C. amarus are valuable sources of resistance to many diseases including Phytophthora fruit rot, powdery mildew, Fusarium wilt, gummy stem blight, anthracnose and various viruses (Levi et al ., ). Therefore, these highly interfertile species have the potential to provide valuable alleles to broaden the genetic base of watermelon and increase disease and pest resistance in elite cultivars.…”

Section: Introductionmentioning

confidence: 97%

“…Many years of cultivation and selection for desirable fruit qualities have resulted in an overall narrowing of the genetic base among sweet dessert watermelon cultivars, and consequently contributed to their susceptibility to a large number of diseases and pests (Levi et al ., , ). As a result, there is a continual need to expand the genetic base of watermelon cultivars and enrich them with alleles conferring resistance to biotic stresses such as diseases, insects and nematodes in addition to alleles associated with desirable fruit quality.…”

Section: Introductionmentioning

confidence: 99%

“…Two of these species, C. amarus (also known as citron) and C. mucosospermus (also known as egusi melon), were until recently considered to be subspecies of C. lanatus (Chomicki and Renner, 2015), and they can cross readily with cultivated watermelon. Citrullus lanatus is thought to be native to northern Africa, C. mucosospermus to sub-Saharan western Africa, and C. amarus to southern Africa (Jarret et al, 1997;Levi et al, 2017;Paris, 2015). Unlike C. lanatus, C. mucosospermus is primarily cultivated for oil-rich seeds.…”

Section: Introductionmentioning

confidence: 99%

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Genome of ‘Charleston Gray’, the principal American watermelon cultivar, and genetic characterization of 1,365 accessions in the U.S. National Plant Germplasm System watermelon collection

Wang

Reddy

et al. 2019

Plant Biotechnology Journal

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Summary Years of selection for desirable fruit quality traits in dessert watermelon (Citrullus lanatus) has resulted in a narrow genetic base in modern cultivars. Development of novel genomic and genetic resources offers great potential to expand genetic diversity and improve important traits in watermelon. Here, we report a high‐quality genome sequence of watermelon cultivar ‘Charleston Gray’, a principal American dessert watermelon, to complement the existing reference genome from ‘97103’, an East Asian cultivar. Comparative analyses between genomes of ‘Charleston Gray’ and ‘97103’ revealed genomic variants that may underlie phenotypic differences between the two cultivars. We then genotyped 1365 watermelon plant introduction (PI) lines maintained at the U.S. National Plant Germplasm System using genotyping‐by‐sequencing (GBS). These PI lines were collected throughout the world and belong to three Citrullus species, C. lanatus, C. mucosospermus and C. amarus. Approximately 25 000 high‐quality single nucleotide polymorphisms (SNPs) were derived from the GBS data using the ‘Charleston Gray’ genome as the reference. Population genomic analyses using these SNPs discovered a close relationship between C. lanatus and C. mucosospermus and identified four major groups in these two species correlated to their geographic locations. Citrullus amarus was found to have a distinct genetic makeup compared to C. lanatus and C. mucosospermus. The SNPs also enabled identification of genomic regions associated with important fruit quality and disease resistance traits through genome‐wide association studies. The high‐quality ‘Charleston Gray’ genome and the genotyping data of this large collection of watermelon accessions provide valuable resources for facilitating watermelon research, breeding and improvement.

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“…ex Eckl. et Zeyh., are among the most grown vegetable fruit crops worldwide (Levi et al, 2017), representing a planted area of more than 3 million hectares, and production exceeding 100 million tons annually (http://faostat.fao.org/). The cultivated citron, egusi, and dessert watermelons have been treated as subspecies of the single species Citrullus lanatus (Fursa, 1972).…”

Section: Introductionmentioning

confidence: 99%

Mapping a Partial Andromonoecy Locus in Citrullus lanatus Using BSA-Seq and GWAS Approaches

et al. 2020

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Genetic Resources of Watermelon

Cited by 42 publications

References 104 publications

Genetic Diversity Assessed by Genotyping by Sequencing (GBS) in Watermelon Germplasm

Genetic Diversity Assessed by Genotyping by Sequencing (GBS) in Watermelon Germplasm

Genome of ‘Charleston Gray’, the principal American watermelon cultivar, and genetic characterization of 1,365 accessions in the U.S. National Plant Germplasm System watermelon collection

Mapping a Partial Andromonoecy Locus in Citrullus lanatus Using BSA-Seq and GWAS Approaches

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