- 著者
- IWASAKI TAKAYA TONO AKITAKA AOKI KYOKO SEO AKIHIRO MURAKAMI NORIAKI
- 出版者
- 日本植物分類学会
- 雑誌
- Acta phytotaxonomica et geobotanica : APG (ISSN:13467565)
- 巻号頁・発行日
- vol.61, no.1, pp.1-20, 2010-06-30
- 被引用文献数
- 1
A phylogeographic study of two species of Carpinus, C. japonica Blume and C. tschonoskii Maxim. (Betulaceae), based on the distribution patterns of their chloroplast DNA haplotypes, is reported. In Japan, these species are mainly distributed in Pacific-type deciduous broad-leaved forests. Using 439-440 and 627-629bp nucleotide sequences of noncoding regions of chloroplast DNA, we detected 5 and 6 haplotypes among 217 and 181 individuals sampled from 52 and 49 populations of C. japonica and C. tschonoskii, respectively. The geographic distribution patterns of the haplotypes were highly structured. We investigated the common phylogeographic patterns between the two species that would indicate the influence of common historical factors such as climate change since the last glacial maximum (LGM). Based on our results, we concluded that the Pacific-type Japanese deciduous broad-leaved forests were split into at least three refugia during the LGM. After the LGM, the species expanded to northern areas or moved to higher altitudes from each refugium, thus now occupying northeastern, central, and southwestern Japan.
- 著者
- HORI KIYOTAKA EBIHARA ATSUSHI NAKATO NARUMI MURAKAMI NORIAKI
- 出版者
- 日本植物分類学会
- 雑誌
- APG : Acta phytotaxonomica et geobotanica (ISSN:13467565)
- 巻号頁・発行日
- vol.66, no.1, pp.47-57, 2015-02-27
The Dryopteris varia complex (subg. Erythrovariae, sect. Variae Fraser-Jenk.) is an apogamous fern complex. Most species of the complex are apogamous triploids; Dryopteris saxifraga and D. varia, the only known diploid sexual cytotypes in the complex, are insufficient to account for the morphological and genetic variation within the complex. In this study, we describe a new diploid sexual species, Dryopteris protobissetiana K. Hori et N. Murak., from southern Yakushima, and discuss its morphological characteristics, reproductive mode, and chromosome number. Dryopteris protobissetiana is similar to D. bissetiana in having slightly bullate scales and a dark green lamina surface, but it differs in having flat, serrate margins at the apex of the upper pinnae. Dryopteris protobissetiana is a sexual diploid with 2n=82, and may be a source of the genetic variation in the apogamous complex.