Phylogenetic analysis reveals the origins of tetraploid and hexaploid species in the Japanese Lepisorus thunbergianus (Polypodiaceae) complex

Journal of Plant Research
Tao FujiwaraYasuyuki Watano

Abstract

The Japanese Lepisorus thunbergianus complex contains diploid and tetraploid races of L. thunbergianus and a hexaploid species, L. mikawanus. Here, we performed molecular phylogenetic analysis on this complex to delimit species and to elucidate the evolutionary origins of tetraploid and hexaploid species. Chloroplast DNA (cpDNA) phylogeny supported the monophyly of the complex. Based on a single-copy nuclear gene (PgiC) tree, the tetraploid L. thunbergianus samples could be classified into two variants: an allotetraploid of hybrid origin between diploid L. thunbergianus and Japanese L. angustus and another allotetraploid of hybrid origin between diploid L. thunbergianus and an unknown diploid race of L. tosaensis. These variants can be recognized morphologically and distinguished from their parent species. Hence, here we described these allopolyploids as new species, L. nigripes and L. kuratae, respectively. The hexaploid species L. mikawanus has three types of PgiC alleles, each of which was derived from diploid L. thunbergianus, L. tosaensis, and Japanese L. angustus, while cpDNA shows that it is included in Japanese L. thunbergianus clade. Based on the cpDNA phylogeny and PgiC nucleotide sequences, we therefore concluded tha...Continue Reading

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Citations

Jan 4, 2020·Journal of Plant Research·Kouki Hikosaka
Oct 9, 2019·Journal of Plant Research·Joel H Nitta, Atsushi Ebihara
Sep 19, 2019·Journal of Plant Research·Atsushi Ebihara, Joel H Nitta
Apr 18, 2020·Molecular Biology and Evolution·Jing WangMing Kang

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Datasets Mentioned

BETA
LC331914
LC331943
LC332083
LC332112
LC332113
LC332166

Methods Mentioned

BETA
flow cytometry
PCR
electrophoresis

Software Mentioned

ClustalW
SumTrees
MrBayes
Tracer
Bioedit
jModelTest
SeqState
Garli

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