Electrophoretic and cytological evidence for genetic heterogeneity and the hybrid origin ofAthyrium oblitescens |
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Authors: | Tomoaki Kurihara Yasuyuki Watano Masayuki Takamiya Tatemi Shimizu |
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Institution: | (1) Department of Biology, Faculty of Science, Kanazawa University, 920-11 Kanazawa, Japan;(2) Department of Biological Science, Faculty of Science, Kumamoto University, 860 Kumamoto, Japan |
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Abstract: | Athyrium oblitescens, a putative hybrid species, was examined electrophoretically and cytologically to clarify its origin. Allozyme data showed
thatA. oblitescens consisted of at least three allozyme types, designated Type C, Type O and Type W. Genotypic compositions of Type C and Type
W suggested that they were derived from independent hybridizations betweenA. otophorum andA. clivicola and betweenA. otophorum andA. wardii, respectively. Contrary to previous reports of tetraploidy inA. oblitescens and its hypothesized parent species, cytological observation revealed that Type C and Type W were both hexaploids. Possible
pathways for the origin of these hexaploids are proposed. Type O was not genetically distinct fromA. otophorum by either electrophoretic or cytological analyses, and thus there was no evidence of hybrid origin. |
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Keywords: | Allozyme Athyrium oblitescens Chromosome number Hexaploidy Reticulate evolution |
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