Cytosystematik, bimodale Chromosomens�tze und permanente Anorthoploidie beiOnosma (Boraginaceae)

Teppner, Herwig

doi:10.1007/bf01373117

Cited by 33 publications

(46 citation statements)

References 29 publications

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“…To address this issue, we focus on the estimation of pollen stainability in diploid and polyploid representatives. From the results of previous studies (Teppner 1971, Liu et al 2004, Madlung et al 2005, Rivero-Guerra 2008, we expect that polyploid taxa, especially odd allopolyploids, will show decreased pollen stainability due to abortive microgametogenesis or primarily during microsporogenesis, when meiosis takes place.…”

Section: Introductionmentioning

confidence: 97%

“…Several studies have been conducted on morphological and anatomical features of selected species of Onosma (Qureshi & Qaiser 1987, Maggi et al 2008, Akçin 2009, Binzet & Akçin 2009, Binzet et al 2010, Akçin et al 2013, Koyuncu et al 2013), but few attempts have been made to study the evolutionary history and diversification of the genus, although Teppner gathered karylogical data on the genus (e.g. Teppner 1971Teppner , 1980Teppner , 1991aTeppner , 1991b, and Kolarčik et al (2010b, Cecchi et al (2011) and Mehrabian et al (2011) conducted molecular studies. The potential of pollen viability data by means of pollen stainability has never been investigated in detail within Onosma.…”

Section: Introductionmentioning

confidence: 98%

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Patterns of pollen stainability in polyploids of the genus Onosma (Boraginaceae)

Kolarčik¹,

Ducár²,

Kačmárová³

et al. 2015

Plecevo

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Background and aims -The genus Onosma (Boraginaceae) is a taxonomically and phylogenetically very complex plant group, with several taxa of hybrid or polyploid origin. An extensive pollen viability survey within the genus could help to solve some evolutionary or taxonomic incertainties within the genus, but it has never been performed. The aim of the present study is to determine the degree of pollen viability of selected species of various ploidy levels and to investigate if microevolutionary processes, such as polyploidization and hybridization, are associated with variation in pollen viability. Methods -Pollen staining with lactophenol blue was chosen as an indirect method for determining pollen viability. Ploidy level information was obtained from an extensive literature search. In mixed populations, the ploidy level of individuals was determined based on flow cytometry screening. Key results -Considerable variation in pollen stainability is present among taxa of Onosma. Pollen stainability is high in most diploids (72-98% in mean), allotetraploids (90%) and allohexaploids (97%), but lower in autotetraploids (71%) and allotriploids (2-49%). At the population level, considerable variation in pollen stainability was found in the allotriploid O. arenaria (14-83%), while the taxonomically related allotetraploid O. pseudoarenaria is less variable (71-99%). Conclusion -This study shows the value of the staining method in the study of the genus Onosma. Low pollen stainability appears to be associated with autopolyploidization as well as recent hybridization processes suggesting the presence of microsporogenesis or microgametogenesis abnormalities. In contrast, pollen stainability is high in stabilized allopolyploids indicating proper meiosis with maintenance of homologous pairing of parental chromosomes and correct pollen development.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

Patterns of pollen stainability in polyploids of the genus Onosma (Boraginaceae)

Kolarčik¹,

Ducár²,

Kačmárová³

et al. 2015

Plecevo

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“…Despite treated only as informal groups by Peruzzi & Passalacqua (2008), Bossier's sections are accepted by Khatamsaz (2002) and seem to be confirmed by karyological (Teppner 1971(Teppner , 1972Vouillamoz 2001;Martonfi et al 2008), palynological (Binzet et al 2010) and molecular evidence (Kolarč ik et al 2010;Mehrabian et al 2011). In Iran, Onosma is widely distributed in Zagros, Alborz, Kopet Dagh mountains and some lowlands of southern parts of the country.…”

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confidence: 85%

Three new species of Onosma L. (Boraginaceae) from Iran

2013

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In this paper, we present some important findings in Onosma sect. Onosma. Data were collected during several surveys in western and northwestern Iran. Three new species were discovered and are illustrared here, namely O. sheidaii sp. nov and O. azarbaidjanensis sp. nov (in subsect. Haplotricha) and O. mozaffariani sp. nov. (In subsect. Heterotricha). An extensive review of literature and the comparative study with specimens kept in 14 Asiatic and European herbaria lead to the assessment of their independent, specific status based on both macro and micro‐ morphological characters, which are discussed in respect to possibly closely allied species. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…These include the R. canina complex (mostly 5x but also 4x and 6x), Leucopogon juniperinus (3x; Smith-White 1948; see also Grant 1971) and some members of the Onosma helvetica group (3x; Teppner 1971). In these organisms, specific meiotic mechanisms have developed to ensure that functional pollen and sperm cell nuclei all have the basic chromosome number x and that functional embryo sacs and egg cells have (2n−x).…”

Section: Extended Genome Size Terminologymentioning

confidence: 98%

2C or not 2C: a closer look at cell nuclei and their DNA content

Greilhuber

Doležel

2009

Chromosoma

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The life cycle of animals and plants involves changes in chromosome number (nuclear phase) and sometimes even the karyotype, and consequently the DNA content of a nuclear genome is not static in time. Thus, in order to interpret DNA content data, it is important that the status of the materials from which DNA content is estimated be precisely defined. The previously proposed distinction between "holoploid" (C) and "monoploid" (Cx) genome size covers the most frequent states of plant and animal nuclear genomes. However, restricting nomenclature to just C and Cx still leaves a number of unresolved problems. Here, we propose an extension of the C-value terminology to handle a range of cytogenetic conditions, life cycle segments, and nuclear phases. A set of superscripts and subscripts are used in a formal way to identify life cycle segments and to express the quantitative relationship between these segments. A revision of the current usage of the holoploid chromosome number n was necessary to maintain the intimate link between n and C-value and between the monoploid chromosome number x and Cx-value. In this revision, haplophase individuals (i.e., "haploid" animals and "haploid" spontaneous or experimentally induced land plant sporophytes) have chromosome number n (not 2n, as is the current tradition) and thus nuclear DNA contents based on 1C. However, to avoid an unlimited progression of n levels due to generative polyploidy, zygotic individuals are assigned as 2n starting from the zygote, whatever their ploidy level. Their ploidy is indicated by multiples of the basic chromosome number x. The extended terminology for genome size should eliminate ambiguities in reporting DNA contents in both plants and animals.

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Cytosystematik, bimodale Chromosomens�tze und permanente Anorthoploidie beiOnosma (Boraginaceae)

Cited by 33 publications

References 29 publications

Patterns of pollen stainability in polyploids of the genus Onosma (Boraginaceae)

Patterns of pollen stainability in polyploids of the genus Onosma (Boraginaceae)

Three new species of Onosma L. (Boraginaceae) from Iran

2C or not 2C: a closer look at cell nuclei and their DNA content

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