Specialization in the behaviour of chromosomes on the meiotic spindle

Sybenga, J.

doi:10.1007/bf00131240

Cited by 23 publications

(18 citation statements)

References 22 publications

(15 reference statements)

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“…Several authors (e.g. VAARMA 1954;HUGHES-SCHRADER and ScHRADER 1961;SYBENGA 1981;WRENSCH et al 1994) suggested that «primitive» bolocentric chromosomes have given rise to monocentric chromosomes. We assume 1987FEINBRUN-DOTHAN 1978FINN 1937FINN 1937VASEDU-VAN 1975FINN 1937VASEDU-VAN 1975P AZY and PLITMANN 1991PAZY and Pr.rrMANN 1991VASUDEVAN 1975FINN 1937present study VASUDEVAN 1975FINN 1937VASUDEVAN 1975KAUL and BHAN 1977SHARMA and CHAT-TERJI 1957KAUL and BHAN 1977 like some other authors (e.g.…”

Section: Discussionmentioning

confidence: 99%

Chromosome divergence in the genusCuscutaand its systematic implications

Pazy

Plitmann

1995

Caryologia

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SUMMARY -Cuscuta L. plants are holoparasites with high chromosome divergence.Species representing the three subgenera of the genus were checked for their chromosome number, length and behaviour. Chromosome numbers range between 2n = 8 and 2n = 60, and their size, although roughly uniform within species, varies between 1-231J.m. On the whole, size or number of Cuscuta chromosomes cannot be used as diagnostic criteria, except for very few species with unique numbers or sizes. Some associations between certain systematic entities and chromosome characters can be inferred. Species of the Old World of subgenus Cuscuta Engelm. are characterized by inverted meiosis and apparently by holocentric chromosomes, whereas species of the two other subgenera, subgenus Monog;yna Engelm. and subgenus Grammica Yuncker, undergo the regular process of meiosis and have monocentric chromosomes. The presence of holocentric chromosomes does not seem to be associated with their number.

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Section: Discussionmentioning

confidence: 99%

Chromosome divergence in the genusCuscutaand its systematic implications

Pazy

Plitmann

1995

Caryologia

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“…Within a given karyotype, the holocentric chromosomes often display variable behaviour during meiosis (Sybenga 1981). Our study confirmed the different behaviour of sex chromosomes and autosomes in meiosis of Dysdera crocata.…”

Section: Modifications Of Meiotic Divisionmentioning

confidence: 98%

Evolution of the karyotype and sex chromosome systems in basal clades of araneomorph spiders (Araneae: Araneomorphae)

et al. 2006

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Concepts of spider karyotype evolution are based mostly on advanced and most diversified clade, the entelegyne lineage of araneomorph spiders. Hence the typical spider karyotype is supposed to consist exclusively of acrocentric chromosomes including the multiple X chromosomes. However, our data show considerable diversity of chromosome morphology and sex chromosome systems in basal clades of araneomorphs. Karyotypes of basal araneomorphs consist of holocentric (superfamily Dysderoidea) or normal chromosomes with localized centromere. In males of basal araneomorphs the prophase of first meiotic division includes a long diffuse stage. Multiple X chromosomes are less common in basal clades. The sex chromosome system of many families includes a Y chromosome or nucleolus organizer region that occurs rarely in the entelegyne spiders. A derived X(1)X(2)Y system with an achiasmatic sex-chromosome pairing during meiosis was found in the families Drymusidae, Hypochilidae, Filistatidae, Sicariidae, and Pholcidae. This suggests a monophyletic origin of the families. In some lineages the X(1)X(2)Y system converted into an X0 system, as found in some pholcids, or into an XY system, which is typical for the family Diguetidae. The remarkable karyotype and sex chromosome system diversity allows us to distinguish four evolutionary lineages of basal araneomorphs and hypothesize about the ancestral karyotype of araneomorphs.

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“…The latter phenomenon, i.e., equatorial division preceding the reductional division, was referred to as "inverted meiosis" (e.g., Cope and Stace 1985). Other terms connected with it were postreductional meiosis and autotellic and amphitellic orientation of sister chromatids in meiosis (e.g., Rieger et al 1968;Sybenga 1981). It has been reported in insects (e.g., in coccids (Hughes-Schrader 1948)) and in a few plant families:…”

Section: Introductionmentioning

confidence: 98%

Unusual chromosome separation in meiosis of Cuscuta L.

Pazy¹,

Plitmann²

1991

Genome

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This study suggests that precocious division of centromeres and probably inverted meiosis (i.e., the rare occasion in meiosis when the equatorial division precedes the reductional division) occur not only in Cuscuta babylonica Choisy but also in several other dodders, regardless of their chromosome number. It was found in four additional species, all of which belong to subgenus Cuscuta. At least two other species (of subgenus Grammica and subgenus Monogyna) undergo the usual process. Therefore, Cuscuta warrants closer study and may provide a better understanding of inverted meiosis as well as the regular process of meiosis.Key words: inverted meiosis, precocious division of centromere, Cuscuta spp.

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Specialization in the behaviour of chromosomes on the meiotic spindle

Cited by 23 publications

References 22 publications

Chromosome divergence in the genusCuscutaand its systematic implications

Chromosome divergence in the genusCuscutaand its systematic implications

Evolution of the karyotype and sex chromosome systems in basal clades of araneomorph spiders (Araneae: Araneomorphae)

Unusual chromosome separation in meiosis of Cuscuta L.

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