Studies on the origin of Clementine tangerine (Citrus reticulata Blanco)

Samaan, L. G.

doi:10.1007/bf00028319

Cited by 7 publications

(3 citation statements)

References 11 publications

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“…For example, Clementine mandarin (also known as Algerian tangerine) is believed to be a chance seedling from a Mediterranean mandarin ( e.g ., Willowleaf) selected just over a century ago in Algeria 27 . Although various male parents have been proposed, serological and molecular studies demonstrated that the Clementine was likely a mandarin × sweet orange hybrid 6 , 18 , 28 . We confirm this hypothesis at the sequence level by definitively identifying a Willowleaf and sweet orange allele at each Clementine locus; demarcating the recombination breakpoints in the meiosis that produced the haploid Clementine sequence; and determining the Willowleaf and sweet orange haplotypes that contributed to diploid Clementine ( Supplementary Note 10, Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Sequencing of diverse mandarin, pummelo and orange genomes reveals complex history of admixture during citrus domestication

et al. 2014

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The domestication of citrus, is poorly understood. Cultivated types are selections from, or hybrids of, wild progenitor species, whose identities and contributions remain controversial. By comparative analysis of a collection of citrus genomes, including a high quality haploid reference, we show that cultivated types were derived from two progenitor species. Though cultivated pummelos represent selections from a single progenitor species, C. maxima, cultivated mandarins are introgressions of C. maxima into the ancestral mandarin species, C. reticulata. The most widely cultivated citrus, sweet orange, is the offspring of previously admixed individuals, but sour orange is an F1 hybrid of pure C. maxima and C. reticulata parents, implying that wild mandarins were part of the early breeding germplasm. A wild “mandarin” from China exhibited substantial divergence from C. reticulata, suggesting the possibility of other unrecognized wild citrus species. Understanding citrus phylogeny through genome analysis clarifies taxonomic relationships and enables sequence-directed genetic improvement.

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Section: Resultsmentioning

confidence: 99%

Sequencing of diverse mandarin, pummelo and orange genomes reveals complex history of admixture during citrus domestication

et al. 2014

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“…and C. aurantium L. [45]. A later serological study showed that Clementine is most closely related to ‘Baladi’ mandarin and ‘Baladi’ blood orange [46]. Molecular markers support the assumption that Clementine is a hybrid between mandarin and sweet orange [47].…”

Section: Discussionmentioning

confidence: 99%

Molecular cytogenetic analysis of genome-specific repetitive elements in Citrus clementina Hort. Ex Tan. and its taxonomic implications

et al. 2019

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Background Clementine mandarin ( Citrus clementina Hort. ex Tan.) is one of the most famous and widely grown citrus cultivars worldwide. Variations in relation to the composition and distribution of repetitive DNA sequences that dominate greatly in eukaryote genomes are considered to be species-, genome-, or even chromosome-specific. Repetitive DNA-based fluorescence in situ hybridization (FISH) is a powerful tool for molecular cytogenetic study. However, to date few studies have involved in the repetitive elements and cytogenetic karyotype of Clementine. Results A graph-based similarity sequence read clustering methodology was performed to analyze the repetitive DNA families in the Clementine genome. The bioinformatics analysis showed that repetitive DNAs constitute 41.95% of the Clementine genome, and the majority of repetitive elements are retrotransposons and satellite DNAs. Sequential multicolor FISH using a probe mix that contained CL17, four satellite DNAs, two rDNAs and an oligonucleotide of (TTTAGGG) 3 was performed with Clementine somatic metaphase chromosomes. An integrated karyotype of Clementine was established based on unequivocal and reproducible chromosome discriminations. The distribution patterns of these probes in several Citrus , Poncirus and Fortunella species were summarized through extensive FISH analyses. Polymorphism and heterozygosity were commonly observed in the three genera. Some asymmetrical FISH loci in Clementine were in agreement with its hybrid origin. Conclusions The composition and abundance of repetitive elements in the Clementine genome were reanalyzed. Multicolor FISH-based karyotyping provided direct visual proof of the heterozygous nature of Clementine chromosomes with conspicuous asymmetrical FISH hybridization signals. We detected some similar and variable distribution patterns of repetitive DNAs in Citrus , Poncirus , and Fortunella , which revealed notable conservation among these genera, as well as obvious polymorphism and heterozygosity, indicating the potential utility of these repetitive element markers for the study of taxonomic, phylogenetic and evolutionary relationships in the future. Electronic supplementary material The online version of this article (10.1186/s12870-019-1676-3) contains supplementary material, which is available to authorized users.

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“…Furthermore, some hybrid citrus germplasms, such as clementine mandarin (C. clementina Hort. ex Tanaka), which may be a hybrid of loose-skin mandarin and sweet orange [17,18], are also widely cultivated. It is known that the fruit of each citrus species has a recognizable aroma trait.…”

Section: Introductionmentioning

confidence: 99%

Volatile Compounds in Fruit Peels as Novel Biomarkers for the Identification of Four Citrus Species

et al. 2019

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The aroma quality of citrus fruit is determined by volatile compounds, which bring about different notes to allow discrimination among different citrus species. However, the volatiles with various aromatic traits specific to different citrus species have not been identified. In this study, volatile profiles in the fruit peels of four citrus species collected from our previous studies were subjected to various analyses to mine volatile biomarkers. Principal component analysis results indicated that different citrus species could almost completely be separated. Thirty volatiles were identified as potential biomarkers in discriminating loose-skin mandarin, sweet orange, pomelo, and lemon, while 17 were identified as effective biomarkers in discriminating clementine mandarins from the other loose-skin mandarins and sweet oranges. Finally, 30 citrus germplasms were used to verify the classification based on β-elemene, valencene, nootkatone, and limettin as biomarkers. The accuracy values were 90.0%, 96.7%, 96.7%, and 100%, respectively. This research may provide a novel and effective alternative approach to identifying citrus genetic resources.

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Studies on the origin of Clementine tangerine (Citrus reticulata Blanco)

Cited by 7 publications

References 11 publications

Sequencing of diverse mandarin, pummelo and orange genomes reveals complex history of admixture during citrus domestication

Sequencing of diverse mandarin, pummelo and orange genomes reveals complex history of admixture during citrus domestication

Molecular cytogenetic analysis of genome-specific repetitive elements in Citrus clementina Hort. Ex Tan. and its taxonomic implications

Volatile Compounds in Fruit Peels as Novel Biomarkers for the Identification of Four Citrus Species

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