Behaviour of ring bivalents in holokinetic systems : Alternative sites of spindle attachment in Pachylis argentinus and Nezara viridula (Heteroptera)

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Heteropteran chromosomes are holokinetic; during mitosis, sister chromatids segregate parallel to each other but, during meiosis, kinetic activity is restricted to one pair of telomeric regions. This meiotic behaviour has been corroborated for all rod bivalents. For ring bivalents, we have previousl...

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Autores principales: Papeschi, Alba G., Mola, Liliana María, Bressa, María José, Greizerstein, E. J., Lia, Verónica Viviana, Poggio, Lidia
Formato: Articulo
Lenguaje:Inglés
Publicado: 2003
Materias:
Ciencias Naturales
Biología
Heteroptera
holokinetic chromosomes
fluorescent in-situ hybridization
Meiosis
ring bivalents
spindle attachment sites
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/131443
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-131443
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Biología
Heteroptera
holokinetic chromosomes
fluorescent in-situ hybridization
Meiosis
ring bivalents
spindle attachment sites
spellingShingle Ciencias Naturales
Biología
Heteroptera
holokinetic chromosomes
fluorescent in-situ hybridization
Meiosis
ring bivalents
spindle attachment sites
Papeschi, Alba G.
Mola, Liliana María
Bressa, María José
Greizerstein, E. J.
Lia, Verónica Viviana
Poggio, Lidia
Behaviour of ring bivalents in holokinetic systems : Alternative sites of spindle attachment in Pachylis argentinus and Nezara viridula (Heteroptera)
topic_facet Ciencias Naturales
Biología
Heteroptera
holokinetic chromosomes
fluorescent in-situ hybridization
Meiosis
ring bivalents
spindle attachment sites
description Heteropteran chromosomes are holokinetic; during mitosis, sister chromatids segregate parallel to each other but, during meiosis, kinetic activity is restricted to one pair of telomeric regions. This meiotic behaviour has been corroborated for all rod bivalents. For ring bivalents, we have previously proposed that one of the two chiasmata releases first, and a telokinetic activity is also achieved. In the present work we analyse the meiotic behaviour of ring bivalents in Pachylis argentinus (Coreidae) and Nezara viridula (Pentatomidae) and we describe for the first time the chromosome complement and male meiosis of the former (2n=12+2m+X0, pre-reduction of the X). Both species possess a large chromosome pair with a secondary constriction which is a nucleolus organizer region as revealed by in-situ hybridization. Here we propose a new mode of segregation for ring bivalents: when the chromosome pair bears a secondary constriction, it is not essential that one of the chiasmata releases first since these regions or repetitive DNA sequences adjacent to them become functional as alternative sites for microtubule attachment and they undertake chromosome segregation to the poles during anaphase I.
format Articulo
Articulo
author Papeschi, Alba G.
Mola, Liliana María
Bressa, María José
Greizerstein, E. J.
Lia, Verónica Viviana
Poggio, Lidia
author_facet Papeschi, Alba G.
Mola, Liliana María
Bressa, María José
Greizerstein, E. J.
Lia, Verónica Viviana
Poggio, Lidia
author_sort Papeschi, Alba G.
title Behaviour of ring bivalents in holokinetic systems : Alternative sites of spindle attachment in Pachylis argentinus and Nezara viridula (Heteroptera)
title_short Behaviour of ring bivalents in holokinetic systems : Alternative sites of spindle attachment in Pachylis argentinus and Nezara viridula (Heteroptera)
title_full Behaviour of ring bivalents in holokinetic systems : Alternative sites of spindle attachment in Pachylis argentinus and Nezara viridula (Heteroptera)
title_fullStr Behaviour of ring bivalents in holokinetic systems : Alternative sites of spindle attachment in Pachylis argentinus and Nezara viridula (Heteroptera)
title_full_unstemmed Behaviour of ring bivalents in holokinetic systems : Alternative sites of spindle attachment in Pachylis argentinus and Nezara viridula (Heteroptera)
title_sort behaviour of ring bivalents in holokinetic systems : alternative sites of spindle attachment in pachylis argentinus and nezara viridula (heteroptera)
publishDate 2003
url http://sedici.unlp.edu.ar/handle/10915/131443
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