Karyotypic description of the stingless bee Melipona quinquefasciata Lepeletier, 1836 (Hymenoptera, Meliponini) with emphasis on the presence of B chromosomes

• Autor(a) principal: Silva, Alexandra Avelar
• Data de Publicação: 2018
• Outros Autores: Rocha, Marla Piumbini, Pompolo, Silvia das Graças, Campos, Lucio Antonio de Oliveira, Tavares, Mara Garcia
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6240122/; http://www.locus.ufv.br/handle/123456789/24625
• topic: Cytogenetics; Heterochromatin; Karyotype; Fluorochromes; FISH

Stingless bees are distributed widely in the tropics, where they are major pollinators of several plant spe- cies. In this study, the karyotype of Melipona quinquefasciata Lepeletier, 1836 was analysed, with emphasis on the presence of B chromosomes. Post-defecating larvae were analysed using Giemsa staining, the C- banding technique, sequential staining with fluorochromes, and FISH. The chromosome number ranged from 2n = 18 to 22 (females) and from n = 9 to 13 (males) due to the presence of 0–4 B chromosomes. This result demonstrates that M. quinquefasciata has the same chromosomal number as other Melipona Illiger, 1806 species. Considering the A complement, heterochromatin was located only in the pericentro- meric region of pair 1. Staining with chromomycin A 3 (CMA 3 ) and labelling with rDNA probe, indicated that this region corresponded to the nucleolus organising region. The B chromosomes of M. quinquefas- ciata could be found in individuals from different localities, they were completely heterochromatic (C- banding) and uniformly stained by 4’,6-diamidino-2-phenylindole (DAPI). Variations in the number of B chromosomes were detected between cells of the same individual, between individuals of the same colony, and between colonies from different localities.