Genome size discriminates between closely related taxaElytrigia repens andE. intermedia (Poaceae: Triticeae) and their hybrid

Mahelka, Václav; Suda, Jan; Jarolímová, Vlasta; Trávníček, Pavel; Krahulec, Frantiŝek

doi:10.1007/bf02804286

Cited by 47 publications

(51 citation statements)

References 55 publications

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“…Genera where detailed studies on genome size variation were already performed include Hydrangea (Cerbah et al. 2001), Artemisia (Torrell and Vallès 2001), Elytrigia (Mahelka et al . 2005) and Curcuma (Leong-Škorničková et al 2007), among others.…”

Section: Discussionmentioning

confidence: 99%

Genome size variation and incidence of polyploidy in Scrophulariaceae sensu lato from the Iberian Peninsula

Castro

Loureiro

2012

AoB PLANTS

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Section: Discussionmentioning

confidence: 99%

Genome size variation and incidence of polyploidy in Scrophulariaceae sensu lato from the Iberian Peninsula

Castro

Loureiro

2012

AoB PLANTS

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“…The occurrence of hybridization among those species of Elytrigia has been suggested on the basis on morphological and anatomical intermediacy of some individuals found in the same habitat as their putative progenitors. Recent flow cytometric and karyological investigations have confirmed common natural hybridization in the Elytrigia repens E. intermedia alliance (Mahelka et al 2005). The genome size turned out to be a reliable marker for these taxa and hybrid delimitation.…”

Section: Introductionmentioning

confidence: 94%

Natural hybridization between Elymus repens and E. hispidus assessed by AFLP analysis

2011

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Hybrid speciation within the genus Elymus is analyzed and discussed. The supposed hybrid origin of Elymus ×mucronatus between Elymus repens and Elymus hispidus was tested. In this aim, pollen viability and AFLP variation of putative progenitors and progenies from two natural populations were studied. Pollen fertility of hybrids ranging from 0 to 91.95% (average 59.50%) indicates the occurrence of F1 hybrids and backcross hybrids. Seven EcoRI/MseI AFLP primer combinations generated a total of 477 AFLP fragments (300 polymorphic) for 48 parental and hybrid individuals. UPGMA and principal coordinates analysis of the AFLP data set show that hybrids are closer to E. hispidus than to E. repens and suggest unidirectional introgression towards E. hispidus. AFLP fragments of the hybrid taxon were additively inherited from the parental species and no hybrid-specific bands were identified. AFLP analysis validates the hybrid status of E. ×mucronatus. Populations in which E. repens, E. hispidus and their hybrids co-occur still progress from early hybridization stages of F1 hybrids to an advanced hybridization stage of a well-established hybrid swarm. E. ×mucronatus is potentially self-sustaining by predominant vegetative reproduction by rhizomes and partial fertility leading to the development of mature seeds. We propose to consider Elymus ×mucronatus as a new species of hybrid origin in the Polish flora.

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“…The knowledge that genome size is usually constant within the same taxonomic entity ( Greilhuber, 2005 ) but may vary tremendously even among closely related taxa ( Bennett and Leitch, 2005 ) provides a foundation for employing genome size as an important taxonomic marker. Indeed, this character has proven successful in resolving complex low-level taxonomies, delimiting species boundaries, and revealing cryptic taxa ( Dimitrova et al, 1999 ;Mahelka et al, 2005 ;Kron et al, 2007 ;Suda et al, 2007 ). Despite its potential taxonomic value, genome size has largely been neglected in the biosystematics of ferns in general (but see Bure š et al, 2003 ;Ebihara et al, 2005 ;Ekrt and Š tech, 2008 ;Ekrt et al, 2009 ), and in the D. carthusiana group in particular.…”

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Species boundaries and frequency of hybridization in the Dryopteris carthusiana (Dryopteridaceae) complex: A taxonomic puzzle resolved using genome size data

Ekrt

Holubova

Trávníček

et al. 2010

American J of Botany

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and 4 Institute of Botany, Academy of Sciences of the Czech Republic, Pr ů honice 1, CZ-252 43 Pr ů honice, Czech Republic• Premise of the study : Genome duplication and interspecifi c hybridization are important evolutionary processes that significantly infl uence phenotypic variation, ecological behavior, and reproductive biology of land plants. These processes played a major role in the evolution of the Dryopteris carthusiana complex. This taxonomically intricate group composed of one diploid ( D. expansa ) and two allotetraploid ( D. carthusiana and D. dilatata ) species in Central Europe. Overall phenotypic similarity, great plasticity, and the incidence of interspecifi c hybrids have led to a continuous dispute concerning species circumscription and delimitation.• Methods : We used fl ow cytometry and multivariate morphometrics to assess the level of phenotypic variation and the frequency of hybridization in a representative set covering all recognized species and hybrids.• Key results : Flow cytometric measurements revealed unique genome sizes in all species and hybrids, allowing their easy and reliable identifi cation for subsequent morphometric analyses. Different species often formed mixed populations, providing the opportunity for interspecifi c hybridization. Different frequencies of particular hybrid combinations depended primarily on evolutionary relationships, reproductive biology, and co-occurrence of progenitors.• Conclusions : Our study shows that genome size is a powerful marker for taxonomic decisions about the D. carthusiana complex and that genome size data may help to resolve taxonomic complexities in this important component of the temperate fern fl ora.

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Genome size discriminates between closely related taxaElytrigia repens andE. intermedia (Poaceae: Triticeae) and their hybrid

Cited by 47 publications

References 55 publications

Genome size variation and incidence of polyploidy in Scrophulariaceae sensu lato from the Iberian Peninsula

Genome size variation and incidence of polyploidy in Scrophulariaceae sensu lato from the Iberian Peninsula

Natural hybridization between Elymus repens and E. hispidus assessed by AFLP analysis

Species boundaries and frequency of hybridization in the Dryopteris carthusiana (Dryopteridaceae) complex: A taxonomic puzzle resolved using genome size data

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