Karyology of Apareiodon affinis from Paraná River (Argentina). I. Chromosome Polymorphism

Calgaro, Marcos R.; Fenocchio, Alberto Sérgio; Pastori, María Cristina; Roncati, Héctor Alberto

doi:10.1508/cytologia.69.475

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…Irrespective of the underlying cause, intraspecific variability, particularly with respect to number, as observed in these chromosomes, is of great genetic interest as these house nucleolar organizing regions which correspond to cluster of rRNA genes (Clark, 2005). This kind of variability has previously been documented in some plant and animal taxa, including Allium sativum (Sato, Hizume & Kawamura, 1980), Allium trifoliatum (Tzanoudakis, 1986), Allium subvillosum (Jamilena, Rejon & Rejon, 1990), Aegilops triuncialis (Ahmadabadi et al, 2002), Microtus mandarinus (Wang et al, 2003a), Niviventer confucianus (Wang et al, 2003b), Astyanax altiparanae (Fernandes & Martins-Santos, 2004) and Apareiodon affinis (Calgaro et al, 2004).…”

Section: Discussionsupporting

confidence: 54%

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Intrapopulation karyotypic variability inAllium royleiStearn - a threatened species

Sharma

Gohil

2008

Botanical Journal of the Linnean Society

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Plants that are heterozygous for complex translocation from a small threatened population of Allium roylei Stearn from the Bani region of Jammu province (India) were analysed for karyotypic details. Somatic complements of all the plants analysed revealed heteromorphicity in one to three pairs of chromosomes. In addition, inter-individual differences were observed regarding the presence or absence of one of the two nucleolar chromosomes, the positions that different heteromorphic chromosomal pairs occupy in the karyoidiograms and the extent of differences in various chromosomal pairs. The present paper records for the first time structural chromosomal polymorhism in A. roylei and highlights the probable mechanisms underlying the origin and establishment of this polymorphism. The extensive karyotypic variability seems to have originated through repeated interchanges involving a number of non-homologous chromosomes. These anamolies are tolerated because there is no loss or gain of genes and, in addition, vegetative propagation is an efficient means of perpetuating the species.

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Section: Discussionsupporting

confidence: 54%

“…, 2003a), Niviventer confucianus (Wang et al. , 2003b), Astyanax altiparanae (Fernandes & Martins‐Santos, 2004) and Apareiodon affinis (Calgaro et al. , 2004).…”

Section: Discussionunclassified

Intrapopulation karyotypic variability inAllium royleiStearn - a threatened species

Sharma

Gohil

2008

Botanical Journal of the Linnean Society

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Do multiple karyomorphs and population genetics of freshwater darter characines (Apareiodon affinis) indicate chromosomal speciation?

Nascimento

Coelho

Nogaroto

et al. 2018

Zoologischer Anzeiger

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Instability of Multiple Sex Chromosomes Systems in Fish: The Case of Erythrinus erythrinus (Bloch & Schneider, 1801) (Characiformes, Erythrinidae)

et al. 2016

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The fish species Erythrinus erythrinus belongs to the family Erythrinidae (order Characiformes, superorder Teleostei) and is considered a species complex because of the considerable differences between the karyotypes of analyzed populations. Whereas some populations present a sex chromosome system with male heterogamety, others do not show differentiated sex chromosomes. In this article, two novel karyotypes of E. erythrinus with the occurrence of male and female heterogamety are described, and a discussion of the stability of multiple sex chromosome systems is provided. A possible cause for sex chromosomes instability is that the Robertsonian rearrangements that originated the multiple systems did not prevent recombination with ancestral chromosomes, which also did not pass through a heterochromatinization process, the opposite of what usually happens with simple systems, especially of the ZZ/ZW or XX/XY type. It is suggested that multiple sex chromosome systems would not act as an effective postzygotic barrier, especially when there are hybridization zones between distinct karyomorphs that bear and that do not bear sex chromosome systems, allowing the generation of hybrids. This finding is important both for the comprehension of sex chromosomes evolution in fish and for conservation biology since the contact between populations with and without multiple sex chromosomes may compromise the regional biodiversity.

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Karyology of Apareiodon affinis from Paraná River (Argentina). I. Chromosome Polymorphism

Cited by 4 publications

References 11 publications

Intrapopulation karyotypic variability inAllium royleiStearn - a threatened species

Intrapopulation karyotypic variability inAllium royleiStearn - a threatened species

Do multiple karyomorphs and population genetics of freshwater darter characines (Apareiodon affinis) indicate chromosomal speciation?

Instability of Multiple Sex Chromosomes Systems in Fish: The Case of Erythrinus erythrinus (Bloch & Schneider, 1801) (Characiformes, Erythrinidae)

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