Morphology and genome size of the widespread weed Cardamine occulta: How it differs from cleistogamic C. kokaiensis and other closely related taxa in Europe and Asia

Marek Šlenker, Judita Zozomová-Lihová, Terezie Mandáková, Hiroshi Kudoh, Yunpeng Zhao, Akiko Soejima, Tetsukazu Yahara, Katarína Skokanová, Stanislav Španiel, Karol Marhold Fls

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Abstract

Cardamine occulta, recently reported also as 'Asian C. flexuosa', is originally a native East Asian weed of paddy fields and other open habitats. It has been recorded throughout the world and is now also spreading widely in Europe. However, how this species differs morphologically from European C. flexuosa and its closest relatives in Asia (C. kokaiensis and C. scutata) is not fully known, particularly because it became widely recognized as a new taxon only recently. We used chromosome counting and flow cytometry to determine ploidies and genome size variation in these four species and morphometric analyses to ascertain their morphological differentiation. A uniformly octoploid level (2n = 64) is confirmed here for C. occulta and a tetraploid level for C. flexuosa and C. scutata (2n = 32). Here we formally describe C. kokaiensis, which is restricted to East Asia (Japan, Honshu; eastern China, Zhejiang Province; perhaps also the Russian Far East) and determine it to be a tetraploid. Considerable differences in monoploid genome size were revealed between these taxa, suggesting their mostly allopolyploid origins. Morphological differences between the species are demonstrated, and detailed morphological descriptions and an identification key are provided.

Original languageEnglish
Pages (from-to)456-482
Number of pages27
JournalBotanical Journal of the Linnean Society
Volume187
Issue number3
DOIs
Publication statusPublished - Jun 26 2018

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All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Plant Science

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