Abstract Detail



Systematics

Šlenker, Marek [1], Zozomová-Lihová, Judita [1], Mandáková, Terezie [2], Kudoh, Hiroshi [3], Marhold, Karol [1].

Cardamine occulta – only recently recognized (again), still colonizing whole globe.

Cardamine occulta and two related species, C. flexuosa and C. hirsuta, have been chronically confused. This is mainly because C. occulta and C. flexuosa have become widely recognized as two distinct taxa only recently, since Lihová et al. in 2006 showed that Eastern Asian weedy populations traditionally assigned to C. flexuosa represent a separate cytotype and genetic lineage. However, confusion in names remained for another ten years, until the correct species name, C. occulta, was determined for the Asian populations. Cardamine hirsuta is another species long known for its invasive behavior. In spite of its obviously different morphology, it is surprising that in some Asian countries (particularly in China and India) plants of C. occulta are constantly misidentified as C. hirsuta. Both C. hirsuta and C. occulta have cosmopolitan distributions. Despite the fact that the distribution of C. occulta is underestimated and recorded occurrences of C. hirsuta are in some areas overestimated due to misidentifications, they both occur on all continents and continue to spread to areas from which they had not been known until recently. The speed of the colonization of new areas by C. occulta can be illustrated on the case of the European continent. While the first herbarium specimen of this species collected in Europe dates back to 1993, currently it is widespread throughout Europe. Despite the original uncertainties in taxonomy, morphological differences among these three taxa are obvious. They were recently proven using multivariate morphometric methods. These species also differ in ploidy levels, namely C. hirsuta is diploid, C. flexuosa is tetraploid and C. occulta octoploid. Genomic in situ hybridization and comparative chromosome painting proved allopolyploid origins: C. amara and C. hirsuta were shown as the parental species of C. flexuosa, while C. amara and C. parviflora genomes were found in C. occulta. Monoploid genome size significantly differs among these three species; in the case of C. occulta monoploid genome size supports its cytogenetically inferred origin. Results of our studies confirm the importance of complex approach to the study of invasive species.


1 - Plant Science & Biodiversity Centre, Slovak Acad. Sci., Institute of Botany, Dubravska cesta 9, Bratislava, BL, SK-84523, Slovakia
2 - Central European Institute of Technology (CEITEC) Masaryk University , Research Group Plant Cytogenomics , Kamenice 5, building A26 , Brno, CZ-62500 , Czech Republic
3 - Kyoto University, Center For Ecological Research, Hirano 2-509-3, Otsu, Shiga, 520-2113, Japan

Keywords:
Brassicaceae
invasive plants
Polyploidy
comparative chromosome painting
Monoploid genome size
multivariate morphometrics.

Presentation Type: Oral Paper
Number:
Abstract ID:329
Candidate for Awards:None


Copyright © 2000-2018, Botanical Society of America. All rights reserved