Corpus ID: 90187190

Characterization and distribution of supernumerary chromosomes in 23 colonies of Partamona helleri (Hymenoptera, Apidae, Meliponinae)

@article{Brito1997CharacterizationAD,
  title={Characterization and distribution of supernumerary chromosomes in 23 colonies of Partamona helleri (Hymenoptera, Apidae, Meliponinae)},
  author={R. Brito and S. G. Pompolo and M. Costa},
  journal={Brazilian Journal of Genetics},
  year={1997},
  volume={20},
  pages={185-188}
}
Unprecedented record of ten novel B chromosomes in the stingless bee Partamona helleri (Apidae, Meliponini)
TLDR
The karyotype variation and the patterns of B chromosome distribution observed indicate that this species is likely undergoing a process of genetic differentiation. Expand
Different Levels of Chromatin Condensation in Partamona chapadicola and Partamona nhambiquara (Hymenoptera, Apidae)
TLDR
Evidence of the existence of a chromatin class with intermediate condensation compared to euchromatin and heterochromatin indicates a potential mechanism for heterochROMatin amplification and demonstrates the need for further studies on this topic. Expand
Cytogenetic Characterization of Two Partamona Species (Hymenoptera, Apinae, Meliponini) by Fluorochrome Staining and Localization of 18S rDNA Clusters by FISH
TLDR
Supernumerary pericentromeric heterochromatin and the non-homologous portion of a heteromorphic pair behaved in a similar fashion, indicating that may be originated by fission. Expand
Investigation of Partamona helleri (Apidae, Meliponini) B chromosome origin. An approach by microdissection and whole chromosome painting
TLDR
The absence of higher dosages of these small B chromosomes in this population of P. helleri suggests an independent origin from the regular karyotype or, alternatively, that the B chromosome may have suffered substantial genetic alterations along its independent evolution. Expand
New occurrence of B chromosomes in Partamonahelleri (Friese, 1900) (Hymenoptera, Meliponini)
TLDR
Cytogenetic analyses of the stingless bee Partamona helleri collected in the state of Bahia, Northeast Brazil revealed the chromosome numbers n = 18 in the haploid males and 2n = 35 in the diploid females, which is the first report of a large B chromosome in P. helleri. Expand
Karyotypic description of the stingless bee Meliponaquinquefasciata Lepeletier, 1836 (Hymenoptera, Meliponini) with emphasis on the presence of B chromosomes
TLDR
The karyotype of M.quinquefasciata has the same chromosomal number as other Melipona Illiger, 1806 species, and heterochromatin was located only in the pericentromeric region of pair 1, indicating that this region corresponded to the nucleolus organising region. Expand
An overview of cytogenetics of the tribe Meliponini (Hymenoptera: Apidae)
TLDR
Cytogenetic information on Meliponini shows that although chromosome number, in general, is conserved among species of a certain genus, other aspects, such as chromosome morphology, quantity, distribution and composition of heterochromatin, may vary between them. Expand
Occurrence and Origin of Supernumerary Chromosomes in Partamona (Hymenoptera: Apidae: Meliponini)
TLDR
The analysis of samples from 861 colonies of Partamona species from 125 Brazilian localities revealed a high frequency of the SCAR marker in the samples of P. helleri, which indicates that the B chromosomes probably are more widespread in this genus than previously thought. Expand
Possible Introgression of B Chromosomes between Bee Species (Genus Partamona)
TLDR
The complete association between B chromosome and SCAR presence and the scarce divergence observed for this DNA sequence between the 4 species analyzed suggest the possibility that this B chromosome has recently been transferred between species through several episodes of interspecific hybridization. Expand
Hybridization and asymmetric introgression between Tetragonisca angustula and Tetragonisca fiebrigi
TLDR
It is demonstrated that there is ongoing hybridization and introgression between T. angustula and T. fiebrigi and it is suggested that they may be better regarded as subspecies. Expand
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