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Phylogeny of Aspleniaceae Inferred from rbcL Nucleotide Sequences

Noriaki Murakami, Satoru Nogami, Mikio Watanabe and Kunio Iwatsuki
American Fern Journal
Vol. 89, No. 4 (Oct. - Dec., 1999), pp. 232-243
Published by: American Fern Society
DOI: 10.2307/1547233
Stable URL: http://www.jstor.org/stable/1547233
Page Count: 12
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Phylogeny of Aspleniaceae Inferred from rbcL Nucleotide Sequences
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Abstract

We determined rbcL sequences of 25 species and 2 varieties of Aspleniaceae with various leaf and rhizome morphologies, and conducted a phylogenetic analyses with the following conclusions: 1) leaf shape is not congruent with rbcL phylogeny in Aspleniaceae; 2) rhizome morphology (erect-ascending or creeping) reflects rbcL phylogeny; 3) naturally occurring hybrids are generated only between closely related species and thus reflect the rbcL phylogeny. The third conclusion was especially well-supported by our allozyme analyses of hypothesized hybrids between distantly related species of Aspleniaceae. A popular cultivated fern hybrid in Japan, Asplenium ×kenzoi, is believed to be a hybrid between A. prolongatum and A. wrightii, which are distantly related in our molecular tree. However, our allozyme analysis of A. ×kenzoi showed that it is a hybrid between A. antiquum and A. prolongatum, whose close relationship was first suggested by our rbcL tree. Thus, A. ×kenzoi appears to to be a hybrid between two closely related species with very different morphologies.

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