Chromosome mechanism inPolididus armatissimus (Reduviidae-Heteroptera)

Jande, S. S.

doi:10.1007/bf02171135

Cited by 3 publications

(1 citation statement)

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“…Similar frequencies of non-segregation were also found in populations collected from Russia, Georgia and Poland (Katowice). Details of the behaviour of the B and the X chromosomes in these males -B and X chromosomes appear as univalents in meiotic prophase cells, form a pseudopair in the center of a radial metaphase I plate and show so called "touch and go pairing", the B chromosome causes a shift in the start of anaphase of the X chromosome at anaphase I -evidence that the B chromosome has integrated into an achiasmatic segregation system similar to that normally responsible for the regular segregation of achiasmatic prereductional X and Y in Heteroptera (Jande, 1960;Nokkala and Nokkala, unpublished) and mchromosomes in Heteroptera (Nokkala, 1986c). Similar behaviour of X and B chromosomes, but much less regular segregation, non-segregation being 24.7 %, was found in one population from Poland (Krakow).…”

Section: B Chromosome -A Chromosome Segregationmentioning

confidence: 99%

Interaction of B chromosomes with A or B chromosomes in segregation in insects

Nokkala¹,

Nokkala²

2004

Cytogenet Genome Res

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Additional or B chromosomes not belonging to the regular karyotype of a species are found in many animal and plant groups. They form a highly heterogeneous group with respect to their morphology and behaviour both in mitosis and meiosis. Achiasmatic mechanisms that ensure the segregation of a B chromosome from another B chromosome or from an A chromosome are reviewed. An achiasmatic mechanism characterized by the “distance pairing” of segregating univalents at metaphase I was found to be responsible for the preferential segregation of B chromosome univalents in Hemerobius marginatus L. (Neuroptera), and a mechanism characterized by the “touch and go pairing” of segregating univalents was responsible for the highly regular segregation of a B chromosome and the X chromosome in Rhinocola aceris (L.) (Psylloidea, Homoptera). The latter mechanism resulted in the integration of a B chromosome to the A chromosome set as a Y chromosome in a psyllid species Cacopsylla peregrina (Frst.). Furthermore, B chromosomes can disturb the regular segregation of the achiasmatic X and Y chromosomes resulting in the formation of X0/XY polymorphism in a population, which might precede the loss of the Y chromosome. The absence of observations on accurately functioning achiasmatic segregation mechanisms in grasshoppers (Orthoptera) was attributed to the X and B chromosomes, which re-orient one or several times during metaphase I. Apparently, these re-orientations mask any achiasmatic segregation mechanism that might operate during meiotic prophase in these insects.

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Section: B Chromosome -A Chromosome Segregationmentioning

confidence: 99%

Interaction of B chromosomes with A or B chromosomes in segregation in insects

Nokkala¹,

Nokkala²

2004

Cytogenet Genome Res

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<p class="HeadingRunIn"><strong>Chromosomes and their meiotic behavior in twelve species of the subfamily Harpactorinae (Hemiptera: Heteroptera: Reduviidae) from north India</strong></p>

Kaur¹,

Kaur²

2013

Zootaxa

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The chromosome complements and male meiosis of 12 species belonging to the subfamily Harpactorinae from north India have been described for the first time. All the species show twelve pairs of autosomes and X multiplicity with 9 species having X 1 X 2 X 3 Y and 3 species having X 1 X 2 Y sex mechanism. The general course of meiosis in all the presently studied species is fairly uniform. Autosomes show a high degree of decondensation and sex chromosomes are condensed during the diffuse stage. Single terminal chiasma per bivalent is seen in all except Sycanus croceovittatus Dohrn, which has two terminal chiasmata in one or two bivalents. A regular arrangement of chromosomes at metaphase I has been observed in 7 species, but in the rest, no definite pattern is recorded. In Euagoras erythrocephala Livingstone and Ravichandran, more than one type of arrangement is seen. At metaphase II, autosomes form a ring in the center of which lies the pseudomultivalent in all the species excepting Rhynocoris costalis (Stål). In Sycanus croceovittatus, a proper pseudotetravalent is lacking. Cytogenetic trends within the subfamily have been discussed in the light of newly added cytogenetic data of 12 species, which may later be used in tracing the evolution of chromosomes in Harpactorinae.

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Comparative Cytogenetics of Lace Bugs (Tingidae, Heteroptera): New Data and a Brief Overview

Голуб

Golub

Anokhin

et al. 2022

Insects

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The lace bug family Tingidae comprises more than 2600 described species in 318 genera that are classified into the subfamilies Tinginae (about 2500 species and 300 genera), Cantacaderinae, and Vianadinae. We provide data on karyotypes of 16 species belonging to 10 genera of the tribes Tingini and Acalyptaini (Tinginae) studied using conventional chromosome staining and FISH. The species of Tingini possess 2n = 12A + XY, whereas those of Acalyptaini have 2n = 12A + X(0). FISH for 18S rDNA revealed hybridization signals on one of the medium-sized bivalents in species of both tribes. FISH with a telomeric probe TTAGG produced no signals in any species. In addition, we provide a list of all data obtained to date on Tingidae karyotypes, which includes 60 species from 22 genera of Tinginae. The subfamily is highly conservative in relation to the number and size of autosomes, whereas it shows diversity in the number and chromosomal distribution of the rDNA arrays, which may be located either on a pair of autosomes (the predominant and supposedly ancestral pattern), on one or both sex chromosomes, or on an autosome pair and the X. The absence of the “insect” telomeric sequence TTAGG in all species implies that Tinginae have some other, yet unknown, telomere organization.

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Chromosome mechanism inPolididus armatissimus (Reduviidae-Heteroptera)

Cited by 3 publications

References 1 publication

Interaction of B chromosomes with A or B chromosomes in segregation in insects

Interaction of B chromosomes with A or B chromosomes in segregation in insects

<p class="HeadingRunIn"><strong>Chromosomes and their meiotic behavior in twelve species of the subfamily Harpactorinae (Hemiptera: Heteroptera: Reduviidae) from north India</strong></p>

Comparative Cytogenetics of Lace Bugs (Tingidae, Heteroptera): New Data and a Brief Overview

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