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Structure, behaviour and repetitive DNA of B-chromosomes in Cestrum nocturnum (Solanaceae)

Montechiari, Keisy Ayelen et al · Taylor & Francis Ltd · 2019

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Author / responsible party
Montechiari, Keisy Ayelen et al
Publisher
Taylor & Francis Ltd
Year
2019
ISSN
1126-3504
ISSN
1126-3504
Language
English

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The Cestrum genus is karyotypically exceptional in Solanaceae. It is characterised by a basic number x = 8, a large chromosomal and genomic size, complex heterochromatin patterns, B-chromosomes (Bs) with particular heterochromatin and distribution of 18?5.8?26S and 5S rDNA. Cestrum nocturnum L. has a diploid number of 2n = 16 plus a variable number of B-chromosomes. The aims of work was to analyse their numerical variation, structure and behaviour of C. nocturnum B-chromosomes by classical and molecular cytogenetics. The individuals analysed had 2n = 16 + 0−13 B-chromosomes. All B-chromosomes were metacentric and smaller than A-chromosomes. The number of B-chromosomes showed a great variability between and within individuals, thereby denoting the occurrence of events that promote mitotic and meiotic instability. Cytogenetic techniques made it possible to observe that B-chromosomes are rich in heterochromatin, probably with AT- and GC-rich regions. In addition, molecular techniques allowed to detect homologous sequences of transposable element conserved domains of Ty1-Copia and Ty3-Gypsy superfamilies. These sequences were located by FISH in all B-chromosomes and some A-chromosomes. Our results showed that repetitive DNA could play an important role in chromosomal evolution as well as in the stability of B-chromosomes in C. nocturnum. Fil: Montechiari, Keisy Ayelen. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentina Fil: González, María Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentina

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APA 7

Montechiari, K. A. E. A. (2019). Structure, behaviour and repetitive DNA of B-chromosomes in Cestrum nocturnum (Solanaceae). http://hdl.handle.net/11336/109286

MLA

Montechiari, Keisy Ayelen et al. "Structure, behaviour and repetitive DNA of B-chromosomes in Cestrum nocturnum (Solanaceae)." 2019. http://hdl.handle.net/11336/109286.

Chicago

Montechiari, Keisy Ayelen et al. 2019. "Structure, behaviour and repetitive DNA of B-chromosomes in Cestrum nocturnum (Solanaceae).". http://hdl.handle.net/11336/109286.

Harvard

Montechiari, K. A. E. A. 2019, Structure, behaviour and repetitive DNA of B-chromosomes in Cestrum nocturnum (Solanaceae), Taylor & Francis Ltd, available at: http://hdl.handle.net/11336/109286 [Accessed 8 Aug. 2026].

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Title
Structure, behaviour and repetitive DNA of B-chromosomes in Cestrum nocturnum (Solanaceae)
Author / contributors
Montechiari, Keisy Ayelen et al
Publisher
Taylor & Francis Ltd
Publication year
2019
ISSN
1126-3504
ISSN
1126-3504
Language
English

Subjects

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B-CHROMOSOMES; CESTRUM NOCTURNUM; MITOTIC AND MEIOTIC INSTABILITY; REPETITIVE DNA; TRANSPOSABLE ELEMENTS; https://purl.org/becyt/ford/1.6; https://purl.org/becyt/ford/1
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