Karyotypic study of Echinops (Asteraceae) in Fars Province, Iran

Sheidai, Masoud

doi:10.1006/bojl.2000.0334

Cited by 9 publications

(10 citation statements)

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“…Our results confirm the negative correlation between DNA amounts per chromosome and chromosome number previously established in Garnatje et al (2004b). Chromosome number shifts coupled with chromosome size changes, along with signals of chromosome fusions/fissions (e.g., Sheidai et al 2000), indicate that karyological changes within Echinops likely proceeded through chromosomal restructurings rather than strict elimination. Shifts in chromosome number and DNAvalue are of primary interest, because they may generate genetic incompatibilities that favor reproductive isolation and therefore speciation (reviewed by Kraaijeveld 2010).…”

Section: Evolution Of Genome Size Of Echinops Representatives In the supporting

confidence: 88%

“…Chromosome numbers in Echinops range from 2n = 26 (E. gmelini Turcz. ; Sánchez-Jiménez et al 2009) to 2n = 36 (E. transcaucasicus Iljin; Gukasyan and Safarian 1990), with 2n = 28, 30, and 32 more frequent (Sheidai et al 2000;Garnatje et al 2004b;Sánchez-Jiménez et al 2009). The only exception is E. acantholepis (= Acantholepis orientalis Less.)…”

Section: Introductionmentioning

confidence: 99%

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Genome size and chromosome number in Echinops (Asteraceae, Cardueae) in the Aegean and Balkan regions: technical aspects of nuclear DNA amount assessment and genome evolution in a phylogenetic frame

et al. 2012

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This work focuses on the representatives of genus Echinops (Asteraceae, Cardueae) in the Aegean and Balkan regions, from the perspective of their genome evolution. Chromosome numbers were determined by orcein staining in 14 populations of nine taxa, and DNA contents were assessed by flow cytometry in 24 populations of nine taxa. A molecular phylogeny based on the internal transcribed spacer (ITS) and trnL-trnF and including first sequences for two taxa (Echinops sphaerocephalus subsp. taygeteus and E. spinosissimus subsp. neumayeri) provided a framework for discussing genome changes. From a methodological point of view, similar C-DNA value estimates were obtained when measuring, for a same population, fresh leaves from adult plants collected in the field and from cultivated seedlings. Conversely, despite giving the appearance of being correct (e.g., low coefficient of variation), genome size assessed using silica gel-preserved material differs significantly from values obtained for the same populations with fresh material. Nevertheless, silica gel-preserved material may still provide rough estimates of genome size for, e.g., inferring ploidy level. Suitablenon-silica gel-based-DNA amounts assessed for 23 populations range from 2C = 6.52 pg (E. spinosissimus subsp. neumayeri) to 2C = 9.37 pg (E. bannaticus). Chromosome counts were established for the first time for Echinops graecus (2n = 32), E. sphaerocephalus subsp. albidus (2n = 32), E. sphaerocephalus subsp. taygeteus (2n = ca. 30), and E. spinosissimus subsp. neumayeri (2n = 28). Genome size and chromosome number are confirmed as crucial parameters for deciphering lineage diversification within the genus Echinops.

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Section: Evolution Of Genome Size Of Echinops Representatives In the supporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Genome size and chromosome number in Echinops (Asteraceae, Cardueae) in the Aegean and Balkan regions: technical aspects of nuclear DNA amount assessment and genome evolution in a phylogenetic frame

et al. 2012

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“…It is closely related (Petit, 1988) to the monospecific annual genus Acantholepis Less., from desert zones of the Irano-Turanian region. Echinops includes diploidized ancient polyploids, with three frequent chromosome numbers (2n=28, 30, 32) and a fourth, less frequent 2n=34 (Sheidai et al, 2000), whereas Acantholepis has 2n=14 Garnatje et al, in press. Another group which is probably related to the previous one (Garcia-Jacas et al, 2002) is the Xeranthemum complex, including the following genera: Amphoricarpus Visiani, with four species from South Eastern Europe, Turkey and the Caucasus, and the only perennial genus in the group; Chardinia Desf., a monospecific genus of the Irano-Turanian region; Siebera J.…”

Section: Introductionmentioning

confidence: 99%

Genome size in Echinops L. and related genera (Asteraceae, Cardueae): karyological, ecological and phylogenetic implications

Garnatje

Vallès

Garcia

et al. 2004

Biology of the Cell

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Genome size was assessed by flow cytometry in 33 species belonging to seven genera of the tribe Cardueae (Asteraceae), which can be grouped in three taxonomic complexes. 2C nuclear DNA content ranged from 1.49 to 16.98 pg, which is more than elevenfold variation. Genome size correlated well with some karyological traits. Nuclear DNA amount variations also have systematic and evolutionary implications and/or are linked to adaptations to ecological conditions.

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“…The chromosomes were sketched with the use of a Camera Lucida and measurements were performed accordingly from such sketches. The chromosomes were identified according to Levan et al (1964), karyotype symmetry was determined according to Stebbins (1981), while other karyotypic parameters like the total form percentage (TF %) and the coefficient of variation of the chromosome size were also determined (Sheidai et al 2000).…”

Section: Cytological Studiesmentioning

confidence: 99%

“…The analysis of variance (ANOVA) and the least significant difference test (LSD) were performed to reveal significant differences in the size of chromosomes among the populations of each species as well as among species with similar somatic chromosome numbers in each section and also among the 3 sections studied (Sheidai et al 2000). The Pearson correlation coefficient was determined among karyotypic features.…”

Section: Statistical Analysesmentioning

confidence: 99%

Karyotype Analysis in Fourteen Species and Varieties of the Genus Bromus L. (Poaceae)

et al. 2008

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Summary Karyotypic analyses were performed in twenty populations of fourteen Bromus species and varieties from three sections of Bromus L., Genea Dum., and Pnigma Dumort., growing in Iran for the first time. The chromosome numbers of B. stenostachyus, B. tomentosus and B. kopetdaghensis are new and new polyploidy level has been reported for B. cappadocicus, B. erectus, B. variegatus and B. tomentosus. The ANOVA and LSD tests revealed a significant differences (pϽ0.01) in the size of chromosomes as well as chromosome arms among the populations of each species, among species with similar somatic chromosome numbers in each section and also among the three sections studied, indicting the role of the chromatin change in the species diversification in the genus Bromus. PCA analysis showed that the mean chromatin length of the chromosomes is one of the most variable karyotypic features among the Bromus species studied. Pearson correlation determined among the karyotypic features showed that the increase in the mean chromatin length has been accompanied with an increase in the size of both short and long arms of the chromosomes. The increase in the mean chromatin length showed a significant correlation with the TF percentage therefore increasing the level of karyotype symmetry.

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Karyotypic study of Echinops (Asteraceae) in Fars Province, Iran

Cited by 9 publications

References 0 publications

Genome size and chromosome number in Echinops (Asteraceae, Cardueae) in the Aegean and Balkan regions: technical aspects of nuclear DNA amount assessment and genome evolution in a phylogenetic frame

Genome size and chromosome number in Echinops (Asteraceae, Cardueae) in the Aegean and Balkan regions: technical aspects of nuclear DNA amount assessment and genome evolution in a phylogenetic frame

Genome size in Echinops L. and related genera (Asteraceae, Cardueae): karyological, ecological and phylogenetic implications

Karyotype Analysis in Fourteen Species and Varieties of the Genus Bromus L. (Poaceae)

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