論文

査読有り
2013年4月

A survey of the fern gametophyte flora of Japan: Frequent independent occurrences of noncordiform gametophytes

AMERICAN JOURNAL OF BOTANY
  • Atsushi Ebihara
  • ,
  • Asami Yamaoka
  • ,
  • Naoko Mizukami
  • ,
  • Aki Sakoda
  • ,
  • Joel H. Nitta
  • ,
  • Ryoko Imaichi

100
4
開始ページ
735
終了ページ
743
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.3732/ajb.1200555
出版者・発行元
WILEY

Premise of the study: Ferns and lycophytes are the only extant land plants with two free-living generations (sporophytes and gametophytes); hence, a single species may have two different distributions. The distribution of the gametophytes of most fern species, which are much smaller in size than sporophytes, are almost unknown due to the difficulty of identifying gametophytes using morphological characters.Methods: Twelve quadrats (1 m(2) or 0.25 m(2)), each subdivided into a grid of 100 (10 x 10) or 25 (5 x 5) squares, were used to survey gametophytes in the Japanese Archipelago, where distribution data of sporophytes and "DNA barcodes" for identification of gametophytes have fully been established in previous studies. Collected gametophytes were identified using the plastid rbcL-a region.Key results: In total, gametophytes of 38 species in two broad morphological categories (28 cordiform and 10 noncordiform species) were identified among 407 collections. The cordiform gametophytes discovered are without exception accompanied by their conspecific sporophytes at the periphery of the quadrats. On the other hand, the sporophytic counterparts of the noncordiform gametophytes are often not found or are rare around the sites.Conclusions: This study demonstrates with a regional flora that fern gametophytes do not always co-occur with sporophytes of the same species. In particular, noncordiform gametophytes tended to occur independently of conspecific sporophytes. This pattern may be due to the capability for indeterminate growth and vegetative reproduction by gemmae in noncordiform gametophytes.

Web of Science ® 被引用回数 : 25

リンク情報
DOI
https://doi.org/10.3732/ajb.1200555
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000318718200009&DestApp=WOS_CPL
ID情報
  • DOI : 10.3732/ajb.1200555
  • ISSN : 0002-9122
  • eISSN : 1537-2197
  • Web of Science ID : WOS:000318718200009

エクスポート
BibTeX RIS