Unusual chromosome separation in meiosis of <i>Cuscuta</i> L.

Pazy, Batia; Plitmann, Uzi

doi:10.1139/g91-082

Cited by 23 publications

(28 citation statements)

References 15 publications

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“…Within the flowering plants, holocentric chromosomes are found in Cyperaceae and Juncaceae (Malheiros and de Castro 1947;Håkansson 1958), Cuscuta L. subgen. Cuscuta (Cuscutaceae; Pazy andPlitmann 1991, 1994), Chionographis Maxim. (Melanthiaceae; Tanaka andTanaka 1977, 1980), and Myristica fragrans Houtt.…”

Section: Introductionmentioning

confidence: 99%

Chromosome Evolution in Cyperales

Roalson¹,

McCubbin²,

Whitkus³

2007

aliso

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Karyotypic evolution is a prominent feature in the diversification of many plants and animals, yet the role that chromosomal changes play in the process of diversification is still debated. At the diploid level, chromosome fission and/or fusion are necessary components of chromosomal structural change associated with diversification. Yet the genomic features required for these events remain unknown. Here we present an overview of what is known about genomic structure in Cyperales, with particular focus on the current level of understanding of chromosome number and genome size and their impact in a phylogenetic context. We outline ongoing projects exploring genomic structure in the order using modern genomics techniques coupled with traditional data sets. Additionally, we explore the questions to which this approach might be best applied, and in particular, detail a project exploring the nature of genomic structural change at the diploid level in genus Carex, a group in which chromosome fission/fusion events are common and associated with diversification of many of its 2000 species. A hypothesized mechanism for chromosome number change in this genus is agmatoploidy, denoting changes in chromosome number without change in DNA amount through fission/fusion of holocentric chromosomes (chromosomes without localized centromeres). This project includes the creation of bacterial artificial chromosome (BAC) and expressed sequence tagged (EST) libraries to be used in physical and genetic linkage mapping studies in order to reveal the patterns of genome structural variation associated with agmatoploidy in Carex, and to explore the sequence and genic characteristics of chromosomal break points in the genome.

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Section: Introductionmentioning

confidence: 99%

Chromosome Evolution in Cyperales

Roalson¹,

McCubbin²,

Whitkus³

2007

aliso

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“…Hughes‐Schrader & Schrader, 1961; Sybenga, 1981). The existence of holocentric chromosomes in a Cuscuta species with the lowest chromosome number in the genus ( C. babylonica , 2n = 8, Figs 5–8), as well as in six other species with higher chromosome numbers of the same subgenus (Pazy & Plitmann, 1987, 1991, 1994, 1995; Garcia 2001), may support their early origin. Similar low chromosome numbers also occur in other holocentric species, e.g.…”

Section: Mechanisms Of Chromosome Evolution In Parasitic Flowering Plmentioning

confidence: 91%

New perspectives on the mechanisms of chromosome evolution in parasitic flowering plants

Pazy

Plitmann

2002

Botanical Journal of the Linnean Society

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In an attempt to find any association between chromosomal characters and parasitism, a cytological study of parasitic flowering plants in Israel has been carried out. While no such association was found, evidence for three levels of chromosome evolution could be discerned: intra‐chromosomal modifications, polyploidy per se, and genome restructuring in polyploids. Our conclusions may serve as a paradigm of the multiple pathways of chromosomal evolution in plants in general. © 2002 The Linnean Society of London, Botanical Journal of the Linnean Society, 138, 117–122.

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“…Por otra parte, para Cuscuta subgéneros Monogyna y Grammica, se citan cariotipos con cromosomas monocéntricos que, de hecho, se correlaciona con nuestras observaciones (Pazy, 1997;Pazy y Plitmann, 1991, 199, 1995, 2002García, 2001; García y Castroviejo, 200). La presencia de las configuraciones cuatripartitas al comienzo de MI en la población de Bárcena, no puede homologarse con la morfología descripta del comportamiento de los cromosomas holocinéticos.…”

Section: I S C U S I ó Nunclassified

Análisis de la meiosis y viabilidad del polen en morfotipos intraespecíficos de Cuscuta paradiana (Cuscutaceae)

Andrada¹,

Páez

Toranzo³

et al. 2018

LILJ

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Análisis de la meiosis y viabilidad del polen en morfotipos intraespecíficos de Cuscuta parodiana (Cuscutaceae)ä Resumen -En la familia Cuscutaceae, el género Cuscuta está representado por plantas holoparásitas con distribución cosmopolita. El taxón incluye tres subgéneros: Cuscuta, Monogyna y Grammica; este último muy representado en América. En este trabajo se exponen la morfología floral, estudios meióticos y viabilidad del polen de ejemplares colectados en cuatro (4) poblaciones de Cuscuta parodiana del subgénero Grammica del Noroeste Argentino. El análisis de la morfología floral permitió diferenciar 4 morfotipos en base a los caracteres de la corola y el gineceo. De las entidades estudiadas tres fueron tetraploides (n = 30) y uno de ellos diploide (n = 15). Durante la meiosis se han observado configuraciones trivalentes y tetravalentes, puentes de cromatina, cromosomas fuera de placa metafásica, citomixis y cuerpos redondeados extranucleares.Palabras clave: Cuscuta parodiana, morfotipos, poliploidía, viabilidad de polen.ä Abstract -In family Cuscutaceae the Cuscuta genus comprises holo-parasitic plants that have cosmopolitan distribution. The genus includes three subgenera: Cuscuta, Monogyna and Grammica; the last one is widely distributed in the American continent. In this work, flower morphology, meiotic studies and pollen viability of 4 natural populations of Cuscuta parodiana subgenus Grammica are presented. The flower morphology allow us to differentiate 4 morphotypes through corolla and gynoecium traits. Three entities analyzed were tetraploids (n = 30), and one was of them diploid (n = 15). Trivalent and tetravalent chromosomal configurations, chromatin bridges, chromosomes outside of metaphasic plate, cytomixis and extranuclear spherical bodies were observed during meiosis.

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Unusual chromosome separation in meiosis of Cuscuta L.

Cited by 23 publications

References 15 publications

Chromosome Evolution in Cyperales

Chromosome Evolution in Cyperales

New perspectives on the mechanisms of chromosome evolution in parasitic flowering plants

Análisis de la meiosis y viabilidad del polen en morfotipos intraespecíficos de Cuscuta paradiana (Cuscutaceae)

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