Two reported cytotypes of the emergent orchid model species Erycina pusilla are two different species

Yeh, Hsuan Yu; Lin, Chun‐Fu; Jong, Hans de; Chang, Song Bin

doi:10.1007/s10681-017-2026-x

Cited by 5 publications

(3 citation statements)

References 67 publications

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“…Dysploids with 2n = 2x = 36 and 2n = 2x = 34 in B. striata were found in this study. Dysploidy is an increase or decrease in the chromosome number as a result of structural rearrangements (Shan et al, 2003;Yang et al, 2014;Yeh et al, 2017). Our information on the nuclear DNA contents of B. striata showed that the 2C values in populations with dysploidy (2n = 2x = 34; 2n = 2x = 36) were not significantly different from those in other B. striata populations with 2n = 2x = 32 (Table 1).…”

Section: Resultsmentioning

confidence: 75%

Ploidy Level, Karyotype, and Genome Size of Bletilla Species (Orchidaceae) From China

Yang

Zhang

et al. 2022

horts

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Bletilla is an Orchidaceae genus with high medical value, including detumescence, antibacterial, and hemostasis. In this study, detailed estimates of ploidy level, karyotype, and genome size were first obtained, and a comprehensive cytological analysis was carried out to better understand the evolution of the genus. The karyotypes of Bletilla were mainly composed of metacentric and submetacentric chromosomes with lengths ranging from 1.25 to 4.93 μm. There was moderate cytological variation in Bletilla (chromosome number 2n = 32 to 76). Diploid with 2n = 34 and 2n = 36 was detected in Bletilla ochracea and Bletilla formosana, respectively, whereas diploid (2n = 32) was dominant in Bletilla striata, dysploidy (2n = 34, 2n = 36) and polyploid (2n = 48, 51, 64, 76) variations were also observed. Three species had a relatively symmetric karyotype, and which of B. ochracea was more asymmetry. The genome size (1C-values) varied from 2.94 pg (B. striata) to 3.33 pg (B. ochracea), of which B. ochracea was significantly larger than the others (P < 0.05). A positive correlation (P < 0.01) between 1Cx vs. haploid chromosome length (HCL) and asymmetry coefficient of karyotypes (AsK%) was observed.

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Section: Resultsmentioning

confidence: 75%

Ploidy Level, Karyotype, and Genome Size of Bletilla Species (Orchidaceae) From China

Yang

Zhang

et al. 2022

horts

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“…The family Orchidaceae Juss. is known for its large variation in both chromosome numbers, which varies more than 20-fold (from 2 n = 10 to 2 n = 240; [ 11 , 12 ]), and genome size, which varies more than 168-fold, the second-largest variability in Angiosperms [ 13 ]. It makes Orchidaceae an interesting clade for studies in karyotype evolution, and by inferring the historical karyotype and genome size modifications, it also gives clues about taxonomic delimitations [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Chromosome Number and Genome Size Evolution in Brasolia and Sobralia (Sobralieae, Orchidaceae)

Baranow

Rojek

Dudek

et al. 2022

IJMS

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Despite the clear circumscription of tribe Sobralieae (Orchidaceae), its internal relationships are still dubious. The recently delimited genus Brasolia, based on previous Sobralia species, is now assumed to be paraphyletic, with a third genus, Elleanthus, nested in it. The morphology of these three genera is significantly different, indicating the necessity of new data for a better genera delimitation. Though morphology and molecular data are available, cytogenetics data for Sobralieae is restricted to two Sobralia and one Elleanthus species. Aiming to evaluate the potential of cytogenetic data for Brasolia-Elleanthus-Sobralia genera delimitation, we present chromosome number and genome size data for 21 and 20 species, respectively, and used such data to infer the pattern of karyotype evolution in these genera. The analysis allowed us to infer x = 24 as the base chromosome number and genome size of average 1C-value of 5.0 pg for the common ancestor of Brasolia-Elleanthus-Sobralia. The recurrent descending dysploidy in Sobralieae and the punctual genome upsize suggest a recent diversification in Sobralieae but did not allow differing between Brasolia and Sobralia. However, the basal position of tribe Sobralieae in the subfamily Epidendroideae makes this tribe of interest to further studies clarifying the internal delimitation and pattern of karyotype evolution.

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“…The co-localization of 5S and 45S rDNA sites has also been reported in related genera such as Prunus subhirtella [28], Fragaria [26,31,41], and Rosa [42][43][44]. The closely linked rDNAs were regarded as an ancestral condition, and the positional changes of the rDNA linkage might have been caused by chromosome arrangements or transposition [45]. Additionally, chromosome pair 1, which exhibited the largest relative length, differed from the other seven pairs of chromosomes and could be considered the representative chromosome of Chinese cherry, as described by Salesses [46].…”

Section: Gish Analysis Between Chinese Cherry and Cerasus Diploid Rel...mentioning

confidence: 65%

Autotetraploid Origin of Chinese Cherry Revealed by Chromosomal Karyotype and In Situ Hybridization of Seedling Progenies

Wang,

Li,

Feng

et al. 2023

Plants

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Polyploidy is considered a driving force in plant evolution and diversification. Chinese cherry [Cerasus pseudocerasus (Lindl.) G.Don], an economically important fruit crop native to China, has evolved at the tetraploid level, with a few pentaploid and hexaploid populations. However, its auto- or allo-polyploid origin remains unclear. To address this issue, we analyzed the ploidy levels and rDNA chromosomal distribution in self- and open-pollinated seedling progenies of tetraploid and hexaploid Chinese cherry. Genomic in situ hybridization (GISH) analysis was conducted to reveal the genomic relationships between Chinese cherry and diploid relatives from the genus Cerasus. Both self- and open-pollinated progenies of tetraploid Chinese cherry exhibited tetraploids, pentaploids, and hexaploids, with tetraploids being the most predominant. In the seedling progenies of hexaploid Chinese cherry, the majority of hexaploids and a few pentaploids were observed. A small number of aneuploids were also observed in the seedling progenies. Chromosome 1, characterized by distinct length characteristics, could be considered the representative chromosome of Chinese cherry. The basic Chinese cherry genome carried two 5S rDNA signals with similar intensity, and polyploids had the expected multiples of this copy number. The 5S rDNA sites were located at the per-centromeric regions of the short arm on chromosomes 4 and 5. Three 45S rDNA sites were detected on chr. 3, 4 and 7 in the haploid complement of Chinese cherry. Tetraploids exhibited 12 signals, while pentaploids and hexaploids showed fewer numbers than expected multiples. Based on the GISH signals, Chinese cherry demonstrated relatively close relationships with C. campanulata and C. conradinae, while being distantly related to another fruiting cherry, C. avium. In combination with the above results, our findings suggested that Chinese cherry likely originated from autotetraploidy.

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Two reported cytotypes of the emergent orchid model species Erycina pusilla are two different species

Cited by 5 publications

References 67 publications

Ploidy Level, Karyotype, and Genome Size of Bletilla Species (Orchidaceae) From China

Ploidy Level, Karyotype, and Genome Size of Bletilla Species (Orchidaceae) From China

Chromosome Number and Genome Size Evolution in Brasolia and Sobralia (Sobralieae, Orchidaceae)

Autotetraploid Origin of Chinese Cherry Revealed by Chromosomal Karyotype and In Situ Hybridization of Seedling Progenies

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