Chromosomes of Five Species of Spittle Bugs(Homoptera, Cercopidae).

Dey, S. K.

doi:10.1508/cytologia.56.523

Cited by 3 publications

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“…Considering the ancestral diploid number for Cercopoidea, i.e., 2n = 26-28 [Kuznetsova and Aguin-Pombo, 2015], Mahanarva has a derived constitution that originated most parsimoniously through chromosomal fusions, leading to a reduction in 2n. Although extensive variability in diploid numbers has been reported in Auchenorrhyncha in high rank taxa such as tribes, families, and subfamilies [Kuznetsova and Aguin-Pombo, 2015], species within the same genus could present more stable karyotypes as noticed here for Ma hanarva , and in Cosmoscarta [Dey, 1991] and Alebra [Kuznetsova et al, 2013].…”

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confidence: 58%

“…mosome staining with description of diploid numbers, that range from 2n = 8 to 2n = 38 in females, and sex chromosomes, revealing predominance of XX ♀ /X0 ♂ [Boring, 1913;Halkka, 1964;Dey, 1991;Kuz netsova and AguinPombo, 2015]. For Cercopidae, ∼ 31 species were karyotyped showing variability for diploid number and sex chromosomes, e.g., 2n = 28, XY ♂ in Cosmoscarta species (C. dimidiata , C. septempunctata , C. decisa , C. egens , and C. fulviceps) ; 2n = 19, X0 ♂ in Mahanarva fimbriolata , M. posticata, and Deois flavopicta ; and 2n = 15, X0 ♂ in Notozulia entreriana [Dey, 1991;Marin-Morales et al, 2002;Castanhole et al, 2010].…”

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“…For Cercopidae, ∼ 31 species were karyotyped showing variability for diploid number and sex chromosomes, e.g., 2n = 28, XY ♂ in Cosmoscarta species (C. dimidiata , C. septempunctata , C. decisa , C. egens , and C. fulviceps) ; 2n = 19, X0 ♂ in Mahanarva fimbriolata , M. posticata, and Deois flavopicta ; and 2n = 15, X0 ♂ in Notozulia entreriana [Dey, 1991;Marin-Morales et al, 2002;Castanhole et al, 2010].…”

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Karyotypes and Repetitive DNA Evolution in Six Species of the Genus Mahanarva (Auchenorrhyncha: Cercopidae)

Anjos

Rocha

Paladini

et al. 2016

Cytogenet Genome Res

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Insects of the Cercopidae family are widely distributed and comprise 59 genera and 431 species in the New World. They are xylemophagous, causing losses in agricultural and pasture grasses, and are considered as emerging pests. Chromosomally, these insects have been studied by standard techniques, revealing variable diploid numbers and primarily X0 sex chromosome systems (males). We performed chromosome studies in 6 Mahanarva (Cercopidae) species using standard and differential chromosome staining as well as mapping of repetitive DNAs. Moreover, the relationship between the repetitive DNAs was analyzed at the interspecific level. A diploid chromosome number of 2n = 19,X0 was documented, with chromosomes gradually decreasing in size. Neutral or GC-rich regions were detected which varied depending on the species. Fluorescence in situ hybridization with a (TTAGG)_n telomeric motif probe revealed terminal signals, matching those of the Cot DNAs obtained from each species, that were also restricted to the terminal regions of all chromosomes. Dot blot analysis with the Cot fraction from M. quadripunctata showed that at least part of the repetitive genome is shared among the 6 species. Our data highlight the conservation of chromosomal features and organization of repetitive DNAs in the genus Mahanarva, suggesting a low differentiation for chromosomes and repetitive DNAs in most of the 6 species studied.

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confidence: 58%

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confidence: 99%

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confidence: 99%

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Karyotypes and Repetitive DNA Evolution in Six Species of the Genus Mahanarva (Auchenorrhyncha: Cercopidae)

Anjos

Rocha

Paladini

et al. 2016

Cytogenet Genome Res

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“…The Cercopidae species Aphrophora forneri , A. alni, Neophilaenus lineatus and N. exclamationis , analyzed by Halkka (1964) , showed chromosome complement with 14A + XY, 14A + X0, 14A + X0 and 18A + XY, respectively. While performing cytogenetic studies of Cercopidae species of the genus Cosmoscarta ( C. dimidiata, C. septempunctata, C. decisa, C. elegans and C. fluviceps ), Dey (1991) found 2n = 28 and a XY sex-determination system, except for C. elegans which showed a neo-XY system. Marin-Morales et al (2002) analyzed two species of Cercopidae from Brazil, Mahanarva fimbriolata and M .…”

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confidence: 99%

Meiotic chromosomes and nucleolar behavior in testicular cells of the grassland spittlebugs Deois flavopicta, Mahanarva fimbriolata and Notozulia entreriana (Hemiptera, Auchenorrhyncha)

et al. 2010

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Spittlebugs annually infest pastures and cause severe damage, representing a serious problem for the tropical American beef cattle industry. Spittlebugs are an important biotic constraint to forage production and there is a lack of cytogenetic data for this group of insects. For these reasons, we conducted this work, in which the spermatogenesis and nucleolar behavior of Deois flavopicta, Mahanarva fimbriolata and Notozulia entreriana were studied. The males possessed testes in the shape of a “bunch of grapes”; a variable number of testicular lobes per individual and polyploid nuclei composed of several heteropycnotic bodies. A heteropycnotic area was located in the periphery of the nucleus (prophase I); the chiasmata were terminal or interstitial; metaphases I were circular or linear and anaphase showed late migration of the sex chromosome. The chromosome complement had 2n = 19, except for N. entreriana (2n = 15); the spermatids were round with heteropycnotic material in the center and elongated with conspicuos chromatin. The analysis of testes after silver nitrate staining showed polyploid nuclei with three large and three smaller nucleolar bodies. Early prophase cells had an intensely stained nucleolar body located close to the chromatin and another less evident body located away from the chromatin. The nucleolar bodies disintegrated during diplotene. Silver staining occurred in two autosomes, in terminal and subterminal locations, the latter probably corresponding to the nucleolus organizer regions (NORs). The spermatids were round with a round nucleolar body and silver staining was observed in the medial and posterior region of the elongated part of the spermatid head.

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U1 snDNA chromosomal mapping in ten spittlebug species (Cercopidade, Auchenorrhyncha, Hemiptera)

Anjos

Paladini

Mariguela

et al. 2018

Genome

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Spittlebugs, which belong to the family Cercopidae (Auchenorrhyncha, Hemiptera), form a large group of xylem-feeding insects that are best known for causing damage to plantations and pasture grasses. The holocentric chromosomes of these insects remain poorly studied in regards to the organization of different classes of repetitive DNA. To improve chromosomal maps based on repetitive DNAs and to better understand the chromosomal organization and evolutionary dynamics of multigene families in spittlebugs, we physically mapped the U1 snRNA gene with fluorescence in situ hybridization (FISH) in 10 species of Cercopidae belonging to three different genera. All the U1 snDNA clusters were autosomal and located in interstitial position. In seven species, they were restricted to one autosome per haploid genome, while three species of the genus Mahanarva showed two clusters in two different autosomes. Although it was not possible to precisely define the ancestral location of this gene, it was possible to observe the presence of at least one cluster located in a small bivalent in all karyotypes. The karyotype stability observed in Cercopidae is also observed in respect to the distribution of U1 snDNA. Our data are discussed in light of possible mechanisms for U1 snDNA conservation and compared with the available data from other species.

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Chromosomes of Five Species of Spittle Bugs(Homoptera, Cercopidae).

Cited by 3 publications

References 4 publications

Karyotypes and Repetitive DNA Evolution in Six Species of the Genus <b><i>Mahanarva </i></b>(Auchenorrhyncha: Cercopidae)

Karyotypes and Repetitive DNA Evolution in Six Species of the Genus <b><i>Mahanarva </i></b>(Auchenorrhyncha: Cercopidae)

Meiotic chromosomes and nucleolar behavior in testicular cells of the grassland spittlebugs Deois flavopicta, Mahanarva fimbriolata and Notozulia entreriana (Hemiptera, Auchenorrhyncha)

U1 snDNA chromosomal mapping in ten spittlebug species (Cercopidade, Auchenorrhyncha, Hemiptera)

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