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Heterochromatic banding patterns on chromosomes of twelve weevil species (Insecta, Coleoptera, Curculionidea: Apionidae, Curculionidae)

100%

Holecova M., Rozek M., Lachowska D.

Folia Biologica

2002

vol. 50

issue 3-4

129-134

The C-banding patterns of twelve weevil species are presented. The obtained results confirm the existence of two groups of species: with a small or large amount of heterochromatin in the karyotype. The first group comprises seven species (Apionidae: Holotrichapion pisi; Curculionidae: Phyllobius urticae, Ph. pyri, Ph. maculicornis, Tanymecus palliatus, Larinodontes turbinatus, Cionus tuberculosus). In weevils with a small amount of heterochromatin, tiny grains on the nucleus in interphase are visible, afterwards in mitotic and meiotic prophase appearing as dark dots. The absence of C-bands does not indicate a lack of heterochromatin but heterochromatic regions are sometimes so small that the condensation is not visible during the cell cycle. The second group comprises five species (Otiorhynchus niger, O. morio, Polydrusus corruscus, Barypeithes chevrolati, Nedyus quadrimaculatus) which possess much larger heteropicnotic parts of chromosomes visible during all nuclear divisions. The species examined have paracentromeric C-bands on autosomes and the sex chromosome X, except for Otiorhynchus niger, which also has an intercalary bands on one pair of autososomes. All the species examined differ in the size of segments of constitutive heterochromatin. The y heterochromosome is dot-like and wholly euchromatic in all the studied species.

Notes on chromosome numbers and C-banding patterns in karyotypes of some weevils from Central Europe (Coleoptera, Curculionoidea: Apionidae, Nanophyidae, Curculionidae)

86%

Lachowska D., Holecova M., Rozek M.

Folia Biologica

2004

vol. 52

issue 1-2

61-66

Chromosome numbers and C-banding patterns of sixteen weevil species are presented. The obtained results confirm the existence of two groups of species with either a small or large amount of heterochromatin in the karyotype. The first group comprises twelve species (Apionidae: Oxystoma cerdo, Eutrichapion melancholicum, Ceratapion penetrans, Ceratapion austriacum, Squamapion flavimanum, Rhopalapion longirostre; Nanophyidae: Nanophyes marmoratus; Curculionidae: Centricnemus (=Peritelus) leucogrammus, Sitona humeralis, Sitona lineatus, Sitona macularis, Sitona suturalis). In weevils with a small amount of heterochromatin, tiny grains on the nucleus during interphase are visible, afterwards appearing as dark dots during mitotic and meiotic prophase. The second group comprises four species from the curculionid subfamily Cryptorhynchinae (Acalles camelus, Acalles commutatus, Acalles echinatus, Ruteria hypocrita) which possess much larger heteropycnotic chromosome parts visible during all nuclear divisions. The species examined have pericentromeric C-bands on autosomes and on the X chromosome.

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2 Folia Biologica

1 2004

1 2002

2 Holecova M.

2 Lachowska D.

2 Rozek M.

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Heterochromatic banding patterns on chromosomes of twelve weevil species (Insecta, Coleoptera, Curculionidea: Apionidae, Curculionidae)

Notes on chromosome numbers and C-banding patterns in karyotypes of some weevils from Central Europe (Coleoptera, Curculionoidea: Apionidae, Nanophyidae, Curculionidae)