Male meiosis, heterochromatin characterization and chromosomal location of rDNA in Microtomus lunifer (Berg, 1900) (Hemiptera: Reduviidae: Hammacerinae)
2011
In the present work, we analysed the male meiosis, the content and distribution of heterochromatin and the number and location of nucleolus organizing regions in Microtomus lunifer (Berg, 1900) by means of standard technique, C- and fluorescent bandings, and fluorescent in situ hybridization with an 18S rDNA probe. This species is the second one cytogenetically analysed within the Hammacerinae. Its male diploid chromosome number is 31 (2n=28+X1X2Y), including a minute pair of m-chromosomes. The diploid autosomal number and the presence of m-chromosomes are similar to those reported in M. conspicillaris (Drury, 1782) (2n=28+XY). However, M. lunifer has a multiple sex chromosome system X1X2Y (male) that could have originated by fragmentation of the ancestral X chromosome. Taking into account that M. conspicillaris and M. lunifer are the only two species within Reduviidae that possess m-chromosomes, the presence of this pair could be a synapomorphy for the species of this genus. C- and fluorescent bandings showed that the amount of heterochromatin in M. lunifer was small, and only a small CMA3 bright band was observed in the largest autosomal pair at one terminal region. FISH with the 18S rDNA probe demonstrated that ribosomal genes were terminally placed on the largest autosomal pair. Our present results led us to propose that the location of rDNA genes could be associated with variants of the sex chromosome systems in relation with a kind of the sex chromosome systems within this family. Furthermore, the terminal location of NOR in the largest autosomal pair allowed us to use it as a chromosome marker and, thus, to infer that the kinetic activity of both ends is not a random process, and there is an inversion of this activity.
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书目信息
Comparative Cytogenetics
卷
5
期
1
页码
1
- 22
ISSN
1993-078X | 1993-0771
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77
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7
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105
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51
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55
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98
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7
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27
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12
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67
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33
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6
页码
713
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卷
33
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205
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138
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XIX
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3
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43
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80
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31
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Behaviour of ring bivalents in holokinetic systems: alternative sites of spindle attachment in Pachylis argentinus and Nezara viridula (Heteroptera).
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11
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9
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5
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47
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Meiosis in holocentric chromosomes: orientation and segregation of an autosome and sex chromosomes in Triatoma infestans (Heteroptera).
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8
页码
17
- 25
Vergleichend-karyologische untersuchungen an lygaeiden.
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1
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31
Karyotype evolution in Reduviidae (Insecta: Heteroptera) with special reference to Stenopodainae and Harpactorinae.
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1
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Localización de regiones organizadoras nucleolares en Cosmoclopius nigroannulatus (Stål) mediante hibridación in situ fluorescente (Harpactorinae, Reduviidae, Heteroptera, Insecta). Sociedad Argentina de Genética. XXXVI Congreso Argentino de Genética. Pergamino, Buenos Aires, Argentina, 2007.
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XVIII
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XVIII
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Insects found in birds’ nests from Argentina: cytogenetic studies in Cimicidae (Hemiptera) and its taxonomical and phylogenetic implications.
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2315
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39
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Meiotic behavior and karyotypic variation in Acledra (Pentatomidae, Heteroptera).
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9
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739
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Karyotype and meiotic behaviour of the holokinetic chromosomes of six Argentine species of Pentatomidae (Heteroptera).
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54
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393
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Meiosis and fluorescent banding in Edessa meditabunda and E. rufomarginata (Heteroptera: Pentatomidae: Edessinae).
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100
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11
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Evolution of the chromosomal location of rDNA genes in two Drosophila species subgroups: ananassae and melanogaster.
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94
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TTAGG telomeric repeats in chromosomes of some insects and other arthropods.
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7
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Notes on the mitotic behavior of long chromosomes.
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6
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10
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92
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Chromosome evolution in the Heteroptera (Hemiptera): agmatoploidy versus aneuploidy.
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Synapsis with and without recombination in the male meiosis of the leaf-footed bug Holhymenia rubiginosa (Coreidae, Heteroptera).
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137
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53
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31
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3
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Studies on chromosomes. I. The behavior of the idiochromosomes in Hemiptera.
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2
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371
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Studies on chromosomes. II. The paired microchromosomes, idiochromosomes and heterotropic chromosomes in Hemiptera.
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2
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507
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Studies on chromosomes. IV The “accessory” chromosome in Syromastes and Pyrrhocoris with a comparative review of the types of sexual differences of the chromosome groups.
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6
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69
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6
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147
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22
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71
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Physical mapping of ribosomal RNA genes in peonies (Paeonia, Paeoniaceae) by fluorescent in situ hybridization: implications for phylogeny and concerted evolution.
卷
86
页码
735
- 740
出版者
Pensoft Publishers
其它主题
Evolutionary trends; Hammacerinae; M-chromosomes; Rdna-fish
语言
英语
类型
Research Article
2024-10-18
MODS
