Ploidy Diversity in the <i>Arisaema ovale</i> Group and the <i>A. nikoense</i> Group (<i>Araceae</i>)

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  • ヒロハテンナンショウ群とユモトマムシグサ群（サトイモ科テンナンショウ属）の倍数性
  • Ploidy Diversity in the Arisaema ovale Group and the A. nikoense Group (Araceae)

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Abstract

<p>Diversity of ploidy levels in the Arisaema ovale group and the A. nikoense group (Araceae), two monophyletic groups sister to each other in the molecular phylogenetic relationship of the genus, was extensively examined throughout their distribution ranges with DNA flow cytometry and microscopic observations of the chromosomes. In A. ovale, hexaploids with 2n = 78, morphologically indistinguishable from previously known tetraploids and pentaploids, were newly found from Aomori Prefecture and Hokkaido. Diploid plants that were previously known only from Shizuoka Prefecture, were newly found from Iwate and Fukushima Prefectures. Arisaema inaense (Seriz.) Seriz. ex K. Sasamura & J. Murata and A. nagiense T. Kobay., K. Sasamura & J. Murata are confirmed to be diploid (2n = 26). Based on the results, a revised hypothesis for the diversity of the A. ovale group reflecting the increase of ploidy level is presented. In the A. nikoense group, A. nikoense Nakai was confirmed to be diploid (2n = 28) and all samples including subsp. alpicola, subsp. australe, subsp. brevicollum, and subsp. nikoense var. nikoense and var. kaimontanum Seriz. were found to be diploid. Consequently, the A. nikoense group is considered to have stayed at diploid level irrespective of the remarkable morphological and geographical diversity.</p>

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