Cytotaxonomic study of genusHymenasplenium (Aspleniaceae) in Xishuangbanna, Southwestern China

Cheng, Xiangdong; Murakami, Noriaki

doi:10.1007/bf02507784

Cited by 17 publications

(12 citation statements)

References 11 publications

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“…Within Aspleniaceae, the Hymenasplenium group (Mitui et al, 1989;Kramer and Viane, 1990;Murakami and Moran, 1993;Murakami, 1995;Cheng and Murakami, 1998) is sister to the other Asplenium species (BP 99), which agrees with the results of Murakami (1995). Due to limited taxon sampling and low sequence divergence, several BP are low, and relationships of A. marinum, A. hemionitis, and the strictly African ceterach group are unresolved in the strict consensus tree.…”

Section: Analysis Of Trnl-trnf Intergenic Spacer Data-the Lengthsupporting

confidence: 81%

Phylogenetic analysis of Asplenium subgenus Ceterach (Pteridophyta: Aspleniaceae) based on plastid and nuclear ribosomal ITS DNA sequences

heede

Viane

Chase

2003

American J of Botany

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Phylogenetic relationships among 20 taxa of the fern genus Asplenium subgenus Ceterach (Filicopsida, represented by 73 accessions) were investigated using DNA sequence data from the nuclear ribosomal internal transcribed spacers (ITS nDNA) and plastid trnL-F intergenic spacer. In addition, a single sample per taxon was used in an analysis of the plastid rbcL gene. Chromosome counts were determined for all the samples, and these demonstrated a range from diploid to octoploid. Analyses of the DNA sequence data indicated that Asplenium subgenus Ceterach is polyphyletic, implicating homoplasy in the characters previously used to circumscribe this taxon. Plastid trnL-F and rbcL analyses resulted in identical tree topologies. The trees produced from the separate plastid and nuclear matrices agree in (1) the recognition of identical groups of accessions corresponding to A. dalhousiae, A. ceterach, A. aureum, A. cordatum, A. phillipsianum, and A. haughtonii; (2) the division of A. subg. Ceterach into two subclades, a Eurasian-Macaronesian and a strictly African alliance; (3) the position of A. dalhousiae as a member of the former subclade; (4) the lack of genetic variation in A. cordatum despite its morphological variability; and (5) the clustering of each autopolyploid with their diploid ancestor. However, the plastid and nuclear trees differ in their placement of A. haughtonii and A. dalhousiae, which might be due to different evolutionary histories of nuclear and plastid genomes, and is possibly an indication of ancient hybridization. The analyses confirm the existence of several strictly African taxa. Asplenium phillipsianum and A. cordatum each form species complexes of diploid and autopolyploid taxa, from which a third, morphologically intermediate, allotetraploid species has originated. Asplenium haughtonii is a distinct endemic species from Saint Helena. The maternally inherited plastid sequences support the hypothesis that A. aureum is an ancestor of A. lolegnamense and of A. octoploideum. Because gene conversion did not eliminate divergent ITS alleles in the allopolyploids, their reticulate ancestry could be demonstrated. Biparentally inherited nrITS sequences support the allopolyploid status of A. aureum, A. lolegnamense, and A. punjabense, indicating they share the ancestral A. javorkeanum genome.

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Section: Analysis Of Trnl-trnf Intergenic Spacer Data-the Lengthsupporting

confidence: 81%

Phylogenetic analysis of Asplenium subgenus Ceterach (Pteridophyta: Aspleniaceae) based on plastid and nuclear ribosomal ITS DNA sequences

heede

Viane

Chase

2003

American J of Botany

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“…However, very little is known about the chromosome numbers of the Neotropical species belonging to this clade. At least some Neotropical species of Hymenasplenium have counts based on x = 36 or x = 39 and the Neotropical species form a grade at the base of the Hymenasplenium clade (see Cheng & Murakami, ; Regalado & Prada, ). Thus, x = 36 was recovered as the putative ancestral character state of Aspleniaceae, but the lack of robustness of the deeper relationships in the Hymenasplenium clade does not allow rejection of the alternative hypothesis that x = 39 is the ancestral base chromosome number of the family.…”

Section: Discussionmentioning

confidence: 99%

Neo‐ and Paleopolyploidy contribute to the species diversity of Asplenium—the most species‐rich genus of ferns

Schneider

Chang

et al. 2017

J of Sytematics Evolution

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Polyploidy is widely considered as a major process in the evolution of plants but the accumulation of polyploid species diversity is still controversial. Some recent studies proposed increased extinction risk in neopolyploids compared with their diploid ancestors. The high proportion of polyploid ferns is expected to be formed mainly by neopolyploids, whereas paleopolyploid species are predicted to be clustered in clades founded by whole genome duplications. Here, we test this prediction by exploring the evolution of polyploidy in the derived fern family Aspleniaceae. The family has a global distribution and shows the highest frequency of polyploid taxa among all ferns. To test the hypothesis, we obtained a comprehensive phylogeny using chloroplast DNA sequences of 883 specimens representing 292 species. All published chromosome counts were mapped onto this phylogenetic framework in order to explore the evolution of polyploids. We recovered evidence for several whole genome duplications in the history of Aspleniaceae. Phylogenetic relationships of polyploids exceeding the tetraploid level suggest that tetraploid Asplenium species may have replaced their diploid ancestors as the main evolutionary players in some clades of this family.

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“…Several apomictic Japanese ferns are known to have ancestral sexual diploid relatives in China (Mitsuta 1986, Nakato et a/. 1995, Cheng and Murakami 1998. There are no cytological data available for the Chinese members of Diplazium with evergreen bi-to tripinnate leaves.…”

Section: Cytological and Reproductive Characteristicsmentioning

confidence: 99%

Cytological and Reproductive Studies on Japanese Diplazium (Woodsiaceae; Pteridophyta): Apomictic Reproduction in Diplazium with Evergreen Bi- to Tripinnate Leaves

1999

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Mitotic and meiotic chromosomes were examined in a total of 162 plants representing 16 taxa in the Japanese Diplazium, including polymorphic terrestrial species with evergreen bi-to tripinnate leaves. Diplazium hachibnse, D. virescens var. virescens, var. conterminum, var. okinawaense, and two other unnamed varieties, D. kawakamii var. kawakamiii, D. dilatatum var. heterolepia, D. taiwanense, D. x kawabatae (= D. dilatatum x taiwanense), D. X takii (= D. hachipense x virescens var. virescens), and D. x nakamurae (= D. hachibnse X virescens var. conterminum) are apomictic triploids (2n=n=123). Diplazium ammianum and D. esculentum are sexual diploids (2n= 82, n=41) and D. subtripinnaturn is a sexual tetraploid (2n= 164, n= 82). Diprazium dilatatum var. dilatatum includes both sexual diploid and apomictic triploid populations.Cultivated gametophytes of six triploid taxa produced sporophytes apogamously, confirming their apomictic reproduction. All three putative hybrids, D. xkawabatae, D. X takii, and D. X nakamurae, are triploid, apomictic, and fertile taxa, therefore they are not the result of hybridization between known pairs of Japanese Diplazium plants.

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Cytotaxonomic study of genusHymenasplenium (Aspleniaceae) in Xishuangbanna, Southwestern China

Cited by 17 publications

References 11 publications

Phylogenetic analysis of Asplenium subgenus Ceterach (Pteridophyta: Aspleniaceae) based on plastid and nuclear ribosomal ITS DNA sequences

Phylogenetic analysis of Asplenium subgenus Ceterach (Pteridophyta: Aspleniaceae) based on plastid and nuclear ribosomal ITS DNA sequences

Neo‐ and Paleopolyploidy contribute to the species diversity of Asplenium—the most species‐rich genus of ferns

Cytological and Reproductive Studies on Japanese Diplazium (Woodsiaceae; Pteridophyta): Apomictic Reproduction in Diplazium with Evergreen Bi- to Tripinnate Leaves

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