Extensive analysis of native and non-native Centaurea solstitialis L. populations across the world shows no traces of polyploidization

PeerJ

article

Ramona-Elena Irimia¹  Daniel Montesinos¹  Özkan Eren³  Christopher J. Lortie⁴  Kristine French⁵  Lohengrin A. Cavieres⁶  Gastón J. Sotes⁶  José L. Hierro⁸  Andreia Jorge¹  João Loureiro¹ 

[1] Centre for Functional Ecology, Department of Life Sciences, University of Coimbra;National Institute of Research and Development for Biological Sciences, Stejarul Research Centre for Biological Sciences;Adnan Menderes Üniversitesi;Department of Biology, York University;School of Biological Sciences, University of Wollongong;Departamento de Botánica, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción;Instituto de Ecología y Biodiversidad;Instituto de Ciencias de La Tierra y Ambientales de la Pampa, Consejo Nacional de Investigaciones Científicas y Técnicas ,(INCITAP-CONICET) and Facultad de Ciencias Exactas y Naturales, Universidad Nacional de La Pampa

关键词: Yellow starthistle;    Invasiveness;    Genome size;    Flow cytometry;    Ploidy level;    Hybridization;   

DOI  :  10.7717/peerj.3531

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

Centaurea solstitialis L. (yellow starthistle, Asteraceae) is a Eurasian native plant introduced as an exotic into North and South America, and Australia, where it is regarded as a noxious invasive. Changes in ploidy level have been found to be responsible for numerous plant biological invasions, as they are involved in trait shifts critical to invasive success, like increased growth rate and biomass, longer life-span, or polycarpy. C. solstitialis had been reported to be diploid (2n = 2x = 16 chromosomes), however, actual data are scarce and sometimes contradictory. We determined for the first time the absolute nuclear DNA content by flow cytometry and estimated ploidy level in 52 natural populations of C. solstitialis across its native and non-native ranges, around the world. All the C. solstitialis populations screened were found to be homogeneously diploid (average 2C value of 1.72 pg, SD = ±0.06 pg), with no significant variation in DNA content between invasive and non-invasive genotypes. We did not find any meaningful difference among the extensive number of native and non-native C. solstitialis populations sampled around the globe, indicating that the species invasive success is not due to changes in genome size or ploidy level.

【 授权许可】

CC BY