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A Natural homoploid hybrid between Centaurea horrida and Centaurea filiformis (Asteraceae) as revealed by morphological and genetic traits

Pisanu, Stefania and Mameli, Giulia and Farris, Emmanuele and Binelli, Giorgio and Filigheddu, Rossella Speranza (2011) A Natural homoploid hybrid between Centaurea horrida and Centaurea filiformis (Asteraceae) as revealed by morphological and genetic traits. Folia Geobotanica, Vol. 46 (1), p. 69-86. ISSN 1211-9520. eISSN 1874-9348. Article.

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DOI: 10.1007/s12224-010-9085-2

Abstract

Studies over the last two decades demonstrate that hybridization has played an integral role in the evolution of several sections of the genus Centaurea. Nevertheless, natural hybridization between narrow Mediterranean endemic Centaurea species has not been documented as yet. A population of fertile Centaurea individuals exhibiting intermediate morphological traits between two Sardinian narrow endemics, C. horrida and C. filiformis, was identified at the Tavolara Islet (Sardinia, Italy). Intermediate leaf length and head width characterized this population, suggesting its hybrid origin. The putative hybrid population was structured (i.e., composed of seedlings, saplings and adult individuals) and had a relatively high levels of seed production. The number of chromosomes was identical to that of the proposed progenitors (2n = 18). Genotyping at five microsatellite loci showed that the putative hybrid possessed several alleles in common with the proposed parental species and intermediate values of genetic differentiation, as indicated by both F ST and R ST, between C. horrida and C. filiformis. We therefore conclude that the studied intermediate population is of hybrid origin, and discuss possible mechanisms of its reproductive isolation from the parental species, potential re-introgression, and evolutionary implications of this hybridization.

Item Type:Article
ID Code:6173
Status:Published
Refereed:Yes
Uncontrolled Keywords:Centaurea, hybrid, Mediterranean basin, microsatellites, morphology, population genetics
Subjects:Area 05 - Scienze biologiche > BIO/03 Botanica ambientale e applicata
Area 05 - Scienze biologiche > BIO/02 Botanica sistematica
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze botaniche, ecologiche e geologiche
Publisher:Springer Netherlands
ISSN:1211-9520
eISSN:1874-9348
Copyright Holders:© Institute of Botany, Academy of Sciences of the Czech Republic 2010
Deposited On:21 Jun 2011 13:13

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