Abstract
Partamona helleri from southeastern Brazil has shown the presence of up to four minute supernumerary chromosomes of the B1 or B2 type and a numeric variation from 2n = 34 to 38 chromosomes. Since the maximum dosage of four of these Bs per individual has been observed, the existence of genetic mechanisms controlling their accumulation has been suggested. In this study, several new types of B chromosomes were found in other localities of the geographic distribution of this species, especially nearby the northern end of the species range, showing a numeric variation of n = 18 to 19 in males and 2n = 34 to 2n = 41 in females. Ten novel types of acrocentric and metacentric B chromosomes were classified as B3 to B12. Eight types were found in the state of Bahia and two types in the state of Espírito Santo. The results suggest that these Bs have had different evolutionary mechanisms involved in their origin and diversification. A variation within and between geographic samples in the number of chromomycin A3 and Ag-NOR markings was observed as a result of the presence or absence of different Bs. Six different B chromosomes showed Ag-NOR markings, which denote presence of gene activity. The karyotype variation and the patterns of B chromosome distribution observed indicate that this species is likely undergoing a process of genetic differentiation.
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Acknowledgments
We thank Dr. Silvia RM Pedro for the specimen identification. This study was supported by CAPES (Coordenadoria de Aperfeiçoamento de Pessoal de Nível Superior) and CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico).
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Manuscript editor: Klaus Hartfelder
Observation inédite de 10 nouveaux chromosomes B chez l’abeille sans aiguillon Partamona helleri (Apidae, Meliponini)
Abeille sans aiguillon / différenciation géographique / chromosome B / bandes Ag-NOR
Ein unerwarteter Befund mit zehn neuen B-Chromosomen bei der stachellosen Biene Partamona helleri (Apidae, Meliponini)
Stachellose Biene / geographische Differenzierung / B-Chromosom / Ag-NOR
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Martins, C.C.C., Waldschmidt, A.M. & Costa, M.A. Unprecedented record of ten novel B chromosomes in the stingless bee Partamona helleri (Apidae, Meliponini). Apidologie 45, 431–439 (2014). https://doi.org/10.1007/s13592-013-0257-y
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DOI: https://doi.org/10.1007/s13592-013-0257-y