A new type of Segregation of the Sex Chromosoems inDysdercus KoenigiiFabr. (Hemiptera-Pyrrhocoridae) A Critical Note

Battagliaa, Emilio

doi:10.1080/00087114.1956.10797559

Cited by 8 publications

(3 citation statements)

References 17 publications

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“…They remain fused during diffuse stage, separate at diplotene to lie apart up to metaphase I, divide equationally during anaphase I, join again at metaphase II, and move to one of the poles together during anaphase II. This phenomenon led RayChaudhuri & Manna (1952) to designate two sex bodies as X and Y and meiosis to be double reductional, which, however, was later contradicted by Battaglia (1956) who designated the sex chromosomes as X 1 and X 2 and proposed the concept of post-reductional meiosis, a proposition which is now widely accepted. The degree of association between X 1 and X 2 is, however, variable in different species.…”

Section: Introductionmentioning

confidence: 99%

“…Two Xs simply come close together in D. cingulatus (Fabricius) (Sharma, 1956) andD. mendesi Blöete (Piza, 1947a); fuse to form a single constricted element in D. koenigii (Fabricius) (Battaglia, 1956;Sharma, 1956), and fuse to form a single mass in P. posthumus Horváth (Parshad, 1957). Verma & Kurl (2009) reported the diploid number of O. nigricornis Stål collected from Forest Research Institute, Dehradun, India to be 2n = 12 = 10A + X 1 X 2 0, a claim which is not clear from their supporting photographic evidence.…”

Section: Introductionmentioning

confidence: 99%

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First report on a multiple sex chromosome system (X1X2X30) and population variations in the frequency of ring bivalents in Pyrrhocoridae (Hemiptera: Heteroptera)

Kaur¹,

Gaba²

2015

Eur. J. Entomol.

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Abstract. The family Pyrrhocoridae (Hemiptera: Heteroptera) is characterized by a modal diploid chromosome number of 16 (♂) ranging from 12 to 33 and simple (X0), multiple (X 1 X 2 0) and neo-sex chromosome systems (neoX-neoY). Out of about 340 known species, only 22 species belonging to 7 genera have to date been cytogenetically analysed. In the present study, the chromosome complement and meiotic details of one species, Odontopus nigricornis Stål has been revised, whilst that of another species, Antilochus russus Stål has been cytogenetically analyzed for the first time. The diploid chromosome complement of O. nigricornis is 2n (♂) = 25 = 22A + X 1 X 2 X 3 0; the first time this particular multiple sex chromosome system has been reported in the Pyrrhocoridae. Three sex chromosomes mostly remain intimately associated during male meiosis and their number was confirmed at diplotene and anaphase II, where they dissociate slightly to become distinct. Meiosis is post-reductional for sex chromosomes. However, unlike other pyrrhocorids with multiple X chromosomes, the X 1 , X 2 and X 3 lie outside the autosomal ring on the metaphase plate during both divisions. The male diploid chromosome complement of A. russus was found to be 2n = 27 = 26A + X0. Apart from the typical meiotic features of heteropterans, the latter species shows inter-and intra-population variations in frequency of ring bivalents.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

First report on a multiple sex chromosome system (X1X2X30) and population variations in the frequency of ring bivalents in Pyrrhocoridae (Hemiptera: Heteroptera)

Kaur¹,

Gaba²

2015

Eur. J. Entomol.

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“…This interpretation has been accepted by WHITE 1954 (page 302) who has made a suggestion that half of the sperm produced in D. koenigi without sex-chromosomes may be analogous to the abnormal sperms produced in certain pentatomids. However, BATTAGLIA (1956) in critical note, after discussing the sex-mechanism in all the species of Dysdercus, has suggested that the sex-mechanism in D. koenigi to be X,X 2 0-type which has been subsequently accepted by the authors (quoted from MANNA 1958).…”

Section: General Considerationsmentioning

confidence: 99%

Cytology ofIphita Limbata(Pyrrhocoridae, Heteroptera)

Rajasekarasetty

1963

Caryologia

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Pairing and segregation of the sex chromosomes in X1X2-males of Dysdercus intermedius with a note on the kinetic organization of Heteropteran chromosomes

Ruthmann

Dahlberg

1976

Chromosoma

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The existence of an X1X2-mode of sex determination is confirmed by a study of all meiotic stages in the male cotton stainer (X1X2) and pertinent stages in the female (X1X1X2X2). In the male, the X-chromosomes are heterochromatic and pair end-to-end in early meiotic prophase. At diakinesis, they disjoin and align side-by-side in the center of the spindle, forming a pseudotetrad. Anaphase I is equational for the sex chromosomes. At late anaphase or telephase, X1 and X2 join end-to-end but form spindle fiber connections to only one of the poles of the metaphase II spindle, leading to one daughter cell without X chromosomes and one with both X1 and X2. An attempt is made to explain sex chromosome pairing and orientation on the basis of a telocentric organization of meiotic chromosomes. The apparent differences in the kinetic organization of mitotic and meiotic chromosomes in Heteroptera are discussed.

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A new type of Segregation of the Sex Chromosoems inDysdercus KoenigiiFabr. (Hemiptera-Pyrrhocoridae) A Critical Note

Cited by 8 publications

References 17 publications

First report on a multiple sex chromosome system (X<sub>1</sub>X<sub>2</sub>X<sub>3</sub>0) and population variations in the frequency of ring bivalents in Pyrrhocoridae (Hemiptera: Heteroptera)

First report on a multiple sex chromosome system (X<sub>1</sub>X<sub>2</sub>X<sub>3</sub>0) and population variations in the frequency of ring bivalents in Pyrrhocoridae (Hemiptera: Heteroptera)

Cytology ofIphita Limbata(Pyrrhocoridae, Heteroptera)

Pairing and segregation of the sex chromosomes in X1X2-males of Dysdercus intermedius with a note on the kinetic organization of Heteropteran chromosomes

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