| Full text | |
| Author(s): |
Lopes, Amalia T.
;
Fernandes, Flavia R.
;
Schneider, Marielle C.
Total Authors: 3
|
| Document type: | Journal article |
| Source: | European Journal of Entomology; v. 113, p. 352-363, 2016. |
| Web of Science Citations: | 1 |
| Abstract | |
In the present work, we have characterized the chromosomes of 13 Cassidinae beetles, belonging to four tribes, the broad aim being to increase the cytogenetic data and establish the mechanisms involved in chromosome evolution of this subfamily, which appear to be conserved karyotypically, i.e. 2n = 16 + Xy(p). The analysis of mitotic and meiotic cells revealed a high diversity of diploid numbers (2n = 18, 2n = 22, 2n = 26, 2n = 32, 2n = 36, 2n = 40, 2n = 42), and the presence of sex chromosome system of the Xy(p) type in most species, with the exception of two representatives that exhibited Xy(r) and XY systems. C-banding showed constitutive heterochromatin predominantly localized in the pericentromeric region of the chromosomes, but differences regarding the number of chromosomes with positive C-bands, intensity of the blocks, and presence of additional bands in autosomes and/or sex chromosomes were observed among the species investigated. Our data revealed that the karyotype 2n = 16 + Xy(p) does not occur in all 13 tribes of the Cassidinae characterized cytogenetically, seeming to be only a shared feature among the species of the Cassidini. Variations in the C-band pattern, mainly in closely related species, suggest that the interspecific karyotype diversification occurred as a result of changes in the quantity and distribution of constitutive heterochromatin. The occurrence of the Xy(p) sex chromosome system in the tribe Mesomphaliini, which showed the highest diversity of simple and multiple systems among the coleopteran as a whole, reinforces the view that derived systems originated by chromosome rearrangements involving the Xy(p) ancestral system. (AU) | |
| FAPESP's process: | 12/12619-2 - Mechanisms of chromosomal differentiation in beetles of the subfamily Cassidinae s.l. (Polyphaga, Chrysomelidae) |
| Grantee: | Amália Torrezan Lopes |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 11/21643-1 - Meiosis in scorpions (Arachnida): model to understand the evolution in species with achiasmate chromosomes |
| Grantee: | Marielle Cristina Schneider |
| Support Opportunities: | Research Grants - Young Investigators Grants |