Cytological and Genetic Study of Two Putative Hybrids and Their Parents of Athyrium (Woodsiaceae; Pteridophyta) in Yakushima Island, Southwestern Japan
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概要
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The mitotic chromosome number, meiotic behavior and sporogenesis, allozyme variation, chloroplast DNA type, and morphological characteristics of two putative hybrids and their putative parents of Athyrium in Yakushima Island, southwestern Japan, were studied. Athyrium ×flavosorum is a sterile hypotetraploid (2n=159), and its putative parents A. arisanense and A. subrigescens are a sexually reproductive hypotetraploid (2n=158) and a sexual tetraploid (2n=160), respectively. Allozyme and morphological analyses showed that, A. ×flavosorum displayed intermediate characteristics between A. arisanense and A. subrigescens. The chloroplast DNA analysis showed that, A. arisanense and A. ×flavosorum had the same SSCP-PCR banding pattern. Athyrium ×purpurascens is a sterile tetraploid (2n=160), and its putative parents, A. subrigescens and A. kuratae, are sexually reproductive tetraploids (2n=160). Allozyme and morphological analyses revealed that A. ×purpurascens was an intermediate between A. subrigescens and A. kuratae; the chloroplast DNA of A. ×purpurascens was the same as that of A. kuratae. These data did not contradict the hypothesis that A. ×flavosorum originated from a hybridization between A. arisanense and A. subrigescens, whereas A. ×purpurascens originate from a hybridization between A. kuratae and A. subrigescens.
- 日本植物分類学会の論文
- 2006-04-28
著者
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TAKAMIYA Masayuki
Department of Biological Science, Kumamoto University
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Terada Yasuko
Kumamoto City Museum
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Takamiya Masayuki
Department Of Biological Science Faculty Of Science Kumamoto University
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