Incremento del numero cromosomico e comparsa di B-cromosomi durante l'allevamento in laboratorio di una popolazione diploide di Dugesia benazzii (triclade paludicolo)

Paolo Deri

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti (1980)

  • Volume: 68, Issue: 4, page 327-332
  • ISSN: 0392-7881

Abstract

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This paper reports on the chromosome variations which occurred during a prolonged laboratory culture in specimens of the freshwater planarian Dugesia benazzii collected in the river Cavo (Corsica). In natural conditions, as well as in the first period of culture (1968-1970), all individuals were sexual and eudiploid in both somatic and germ cells. In 1971-1972, however, they became agamic and fissiparous. Their somatic cells showed a hyperdiploid complement of 19-26 chromosomes, which appeared homologous to the ones of the standard set of the species (A-chromosomes). More recently, B-chromosomes in a number of 1-3 and morphologically similar to those already described by the A. in other natural populations from Corsica, have been observed in 85% of the hyperdiploid somatic cells. The origin of polysomy and the mechanism of its transmission as well as the factors determining the appearance of the B-chromosomes in this strain are still unknown. The increase in chromosome number preceded the appearance of B-chromosomes, but a causal relationship between these two events is not ascertained. It is also worthy of attention that these karyological variations occurred after a long period of laboratory culture and at the time that fissioning was acquired. Aneuploidy has been frequently observed in fissiparous species of the "D. gonocephala group"; however, the correlation between these two phenomena is not constant and probably depends on specific genetic factors.

How to cite

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Deri, Paolo. "Incremento del numero cromosomico e comparsa di B-cromosomi durante l'allevamento in laboratorio di una popolazione diploide di Dugesia benazzii (triclade paludicolo)." Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti 68.4 (1980): 327-332. <http://eudml.org/doc/288976>.

@article{Deri1980,
author = {Deri, Paolo},
journal = {Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti},
language = {ita},
month = {4},
number = {4},
pages = {327-332},
publisher = {Accademia Nazionale dei Lincei},
title = {Incremento del numero cromosomico e comparsa di B-cromosomi durante l'allevamento in laboratorio di una popolazione diploide di Dugesia benazzii (triclade paludicolo)},
url = {http://eudml.org/doc/288976},
volume = {68},
year = {1980},
}

TY - JOUR
AU - Deri, Paolo
TI - Incremento del numero cromosomico e comparsa di B-cromosomi durante l'allevamento in laboratorio di una popolazione diploide di Dugesia benazzii (triclade paludicolo)
JO - Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
DA - 1980/4//
PB - Accademia Nazionale dei Lincei
VL - 68
IS - 4
SP - 327
EP - 332
LA - ita
UR - http://eudml.org/doc/288976
ER -

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