C-banding patterns inSalmo trutta, a species of tetraploid origin

Zenzes, Maria Teresa; Voiculescu, I.

doi:10.1007/bf01772875

Cited by 36 publications

(21 citation statements)

References 11 publications

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“…The analysis of the results leads us to suggest the existence of an interindividual and probably interpopulational variation in NF which is essentially due to the polymorphism of the NORbearing chromosome. This can appear as acrocentric in some cases (Capanna et a!., 1973;Raicu & Taisescu, 1977;Al-Sabti, 1985), and as submetacentric-subtelocentric in others (Zenzes & Voiculescu, 1975;Hartley & Home, 1984;Mayr et al, 1986). The populations analysed in our study show a similarity between them, this chromosome pair appearing as submeta or subtelocentric in the majority.…”

Section: Discussionsupporting

confidence: 54%

“…The data published on this subject to date reveal a great heterogeneity in NF according to the authors and the populations analysed. The values range from NF= 100 (Nygren et a!., 1971;Capanna et a!., 1973;Al-Sabti, 1985) to NF= 104 (Raicu & Taisescu, 1977), some authors claiming NF= 102 (Zenzes & Voiculescu, 1975;Hartley & Home, 1984). The analysis of the results leads us to suggest the existence of an interindividual and probably interpopulational variation in NF which is essentially due to the polymorphism of the NORbearing chromosome.…”

Section: Discussionmentioning

confidence: 99%

“…In Salmo trutta, and in those species with a chromosome number around 80, this fact is not so evident. So, Zenzes & Voiculescu (1975) and Hartley & Home (1984) described (in some populations of Brown Trout) inter-and intraindividual polymorphism in chromosome number, which could be explained in some cases as Robertsonian translocations because of their constancy in chromosome number (NF). Other authors, however, have not found evidence of such polymorphism in this species (Capanna et al, 1973;Raicu & Taisescu, 1977;Al-Sabti, 1985), implying that the intraindividual variation is the result of an aneuploidization mechanism or of a technical deficiency.…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, few karyotipic studies have been performed on this populational perspective. The majority have emphasized the possible existence of intra-and interindividual polymorphism in chromosome and arm numbers in relation to the tetraploid origin of salmonids in the process of diploidization (Zenzes & Voiculescu, 1975;Hartley and Home, 1984), but little attention has been paid to the differenCorrespondence; Dr. L. Sanchez, Departamento de Biologia Fundamental, Area de Genética, Universidad de Santiago, 27002 Lugo, Spain. 9 tiation between geographical or ecological forms; the chromosome images and sample sizes in these studies did not permit a precise analysis of the variation found.…”

Section: Introductionmentioning

confidence: 99%

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Cytogenetical characterization of hatchery stocks and natural populations of Sea and Brown Trout from northwestern Spain

et al. 1991

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Section: Discussionsupporting

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cytogenetical characterization of hatchery stocks and natural populations of Sea and Brown Trout from northwestern Spain

et al. 1991

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“…Only two chromosomes showed pericentromeric heterochromatic regions. Since the presence of interstitial C-heterochromatin would reveal the occurrence of chromosomal rearrangements by pericentric inversions (Zenzes & Voiculescu, 1975), chromosome microrearrangements involving heterochromatin seem to have occurred during the spread of P. volitans which is consistent with the significant molecular differentiation of lionfish reported by Betancur et al (2011) between the Northern (US east coast, the Bahamas and Bermuda) and the Caribbean populations of P. volitans of the Western Atlantic.…”

Section: Discussionsupporting

confidence: 73%

Karyotype of the invasive species Pterois volitans (Scorpaeniformes: Scorpaenidae) from Margarita Island, Venezuela

Nirchio

Ehemann

Siccha-Ramírez

et al. 2014

RBT

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Abstract:The genus Pterois includes nine valid species, native to the Red Sea and Indian Ocean throughout the Western Pacific. P. volitans and P. miles are native to the Indo-Pacific, and were introduced into Florida waters as a result of aquarium releases, and have been recently recognized as invaders of the Western Atlantic and Caribbean Sea (Costa Rica to Venezuela). Thus far, cytogenetic studies of the genus Pterois only cover basic aspects of three species, including P. volitans from Indo-Pacific Ocean. Considering the lack of more detailed information about cytogenetic characteristics of this invasive species, the objective of the present study was to investigate the basic and molecular cytogenetic characteristics of P. volitans in Venezuela, and compare the results with those from the original distribution area. For this, the karyotypic characteristics of four lionfish caught in Margarita Island, Venezuela, were investigated by examining metaphase chromosomes by Giemsa staining, C-banding, Ag-NOR, and two-colour-Fluorescent in situ hybridization (FISH) for mapping of 18S and 5S ribosomal genes. Comparing the sequences of the 16S gene of the specimens analyzed, with sequences already included in the Genbank, we corroborated that our specimens identified as P. volitans are in fact this species, and hence exclude the possibility of a misidentification of P. miles. The diploid number was 2n=48 (2m+10sm+36a) with FN=60. Chromosomes uniformly decreased in size, making it difficult to clearly identify the homologues except for the only metacentric pair, and the pairs number two, the largest of the submetacentric series. C-banding revealed only three pairs of chromosomes negative for C-band, whereas all remaining chromosomes presented telomeric and some interstitial C-positive blocks. Only two chromosomes were C-banding positive at the pericentromeric regions. Sequential staining revealed Ag-NOR on the tips of the short arms of chromosome pair number two and the FISH assay revealed that 18S rDNA and 5S rDNA genes are co-located on this chromosome pair. The co-localization of 5S rDNA and 45S rDNA is discussed. Both constitutive heterochromatin and NOR location detected in samples examined in this study, differ from those reported for P. volitans in previous analysis of specimens collected in Indian Ocean (Java), suggesting the occurrence of chromosome microrearrangements involving heterochromatin during the spread of P. volitans. Rev. Biol. Trop. 62 (4): 1365-1373. Epub 2014 December 01.

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