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<p><i>Tetragonisca angustula</i> and <i>Tetragonisca fiebrigi</i> are two stingless bees’ species commonly known as “jataí”. Cytogenetic data indicates the presence of B chromosomes in <i>T. fiebrigi</i> and absence in <i>T. angustula</i>, constituting a cytotaxonomic character. The present study aimed to investigate karyotypic and genome size differences between <i>T. angustula</i> and <i>T. fiebrigi</i>, focusing on the possible correlation between number of B chromosomes and DNA content variation. 10 colonies of <i>T. angustula</i> and 16 colonies of <i>T. fiebrigi</i> were sampled from different geographical locations. Conventional cytogenetic analyses were performed, and 1&#xa0;C DNA content was measured by flow cytometry. Both species showed 2<i>n</i> = 34 and similar karyotype, with biarmed chromosomes composed of one euchromatic and one heterochromatic arm. B chromosomes were found only in <i>T. fiebrigi</i> individuals, varying from 1B to 7B in females and from 0B to 5B in males. The mean 1&#xa0;C value from 45 <i>T. angustula</i> individuals was 1&#xa0;C = 0.95 ± 0.079 pg, and the mean 1&#xa0;C value from 53 <i>T. fiebrigi</i> individuals was 1&#xa0;C = 0.93 ± 0.048 pg. The ANOVA indicated no statistical difference in 1&#xa0;C value between <i>T. angustula</i> and <i>T. fiebrigi</i>. The fact that there is no increase in <i>T. fiebrigi</i> genome size points to the direction of an intraspecific origin of the B chromosomes in this species.</p>

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An intraspecific origin of B chromosomes in Tetragonisca fiebrigi (Apidae: Meliponini) inferred from cytogenetic and nuclear genome size data

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月14日

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  • Marina Souza Cunha,
  • José Lino-Neto,
  • Fernanda Aparecida Ferrari Soares,
  • Wellington Ronildo Clarindo,
  • Milton Rönnau,
  • Lucio Antonio Oliveira Campos,
  • Denilce Meneses Lopes

摘要

Tetragonisca angustula and Tetragonisca fiebrigi are two stingless bees’ species commonly known as “jataí”. Cytogenetic data indicates the presence of B chromosomes in T. fiebrigi and absence in T. angustula, constituting a cytotaxonomic character. The present study aimed to investigate karyotypic and genome size differences between T. angustula and T. fiebrigi, focusing on the possible correlation between number of B chromosomes and DNA content variation. 10 colonies of T. angustula and 16 colonies of T. fiebrigi were sampled from different geographical locations. Conventional cytogenetic analyses were performed, and 1 C DNA content was measured by flow cytometry. Both species showed 2n = 34 and similar karyotype, with biarmed chromosomes composed of one euchromatic and one heterochromatic arm. B chromosomes were found only in T. fiebrigi individuals, varying from 1B to 7B in females and from 0B to 5B in males. The mean 1 C value from 45 T. angustula individuals was 1 C = 0.95 ± 0.079 pg, and the mean 1 C value from 53 T. fiebrigi individuals was 1 C = 0.93 ± 0.048 pg. The ANOVA indicated no statistical difference in 1 C value between T. angustula and T. fiebrigi. The fact that there is no increase in T. fiebrigi genome size points to the direction of an intraspecific origin of the B chromosomes in this species.