The chromosome number and phylogenetic position of the monotypic eusporangiate genus Mankyua (Ophioglossaceae), which shares peculiar morphological characteristics with Ophioglossum s.l. and Helminthostachys, were determined. Meiotic and mitotic chromosome observations of Mankyua show n = 130 and 2n = ca. 260, suggesting that the base number of this genus is x = 130, which is a new finding and the highest base number reported so far for Ophioglossaceae. The molecular phylogenetic trees derived from nucleotide sequence variation of rbcL and matK genes differ in terms of the phylogenetic position of Mankyua. The molecular phylogenetic trees based on combined data sets of rbcL and matK suggest that Mankyua might be the earliest-diverging lineage of Ophioglossaceae.
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1 October 2013
The use of matK in Ophioglossaceae Phylogeny and the Determination of Mankyua Chromosome Number Shed Light on Chromosome Number Evolution in Ophioglossaceae
Wataru Shinohara,
Narumi Nakato,
Yoko Yatabe-Kakugawa,
Taketoshi Oka,
Jong Kun Kim,
Noriaki Murakami,
Hiroshi Noda,
Norio Sahashi
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Systematic Botany
Vol. 38 • No. 3
July 2013
Vol. 38 • No. 3
July 2013
Botrychium
Helminthostachys
Mankyua chejuense
Morphological evolution
Ophioglossum
rbcL
