Seed Ecology of Lobelia boninensis Koidz. (Campanulaceae), an Endemic Species in the Bonin Islands (Japan) :

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著者

    • MARIKO SHIGERU
    • Global Environment Research Division, The National Institute for Environmental Studies:(Present address)Sugadaira Montane Research Center, University of Tsukuba
    • KACHI NAOKI
    • Global Environment Research Division, The National Institute for Environmental Studies:(Present address)Department of Biology, Faculty of Science, Tokyo Metropolitan University

抄録

We examined seed germination of Lobelia boninensis Koidz. (Campanulaceae) in incubators and its seed production in a greenhouse. This monocarpic perennial is an endemic and endangered species in the Miscanthus boninensis vegetation on coastal cliffs in the Bonin Islands. Seeds germinated over a range of from 10° to 30℃ ; at these temperatures germination began only after eight days of incubation. A cool, moist stratification treatment did not promote germination. Based on these temperature responses, it is expected that in their native habitat Lobelia seeds germinate between October and November, when precipitation is frequent. Lobelia seeds, which remain capable of germinating for a few years after storage in the lab, are positively photoblastic, and this may allow the seeds to detect gaps or safe sites in vegetation. These results suggest that Lobelia seeds may form a seed bank beneath a closed canopy, due to enforced dormancy. Lobelia seeds germinated under saline conditions up to 300 mM NaCl. In the greenhouse, some individuals began to reproduce 2.5 years after germination. Plants are self-compatible, and they produced an average of >4.5 × 10^5 small seeds (ca. 0.12 mg). Lobelia has a strategy of seed germination suited to colonize the M. boninensis vegetation, where the maritime impact is reduced. This endangered species can easily be propagated ex situ.

We examined seed germination of Lobelia boninensis Koidz. (Campanulaceae) in incubators and its seed production in a greenhouse. This monocarpic perennial is an endemic and endangered species in the Miscanthus boninensis vegetation on coastal cliffs in the Bonin Islands. Seeds germinated over a range of from 10° to 30℃ ; at these temperatures germination began only after eight days of incubation. A cool, moist stratification treatment did not promote germination. Based on these temperature responses, it is expected that in their native habitat Lobelia seeds germinate between October and November, when precipitation is frequent. Lobelia seeds, which remain capable of germinating for a few years after storage in the lab, are positively photoblastic, and this may allow the seeds to detect gaps or safe sites in vegetation. These results suggest that Lobelia seeds may form a seed bank beneath a closed canopy, due to enforced dormancy. Lobelia seeds germinated under saline conditions up to 300 mM NaCl. In the greenhouse, some individuals began to reproduce 2.5 years after germination. Plants are self-compatible, and they produced an average of >4.5 × 10^5 small seeds (ca. 0.12 mg). Lobelia has a strategy of seed germination suited to colonize the M. boninensis vegetation, where the maritime impact is reduced. This endangered species can easily be propagated ex situ.

収録刊行物

  • Plant species biology

    Plant species biology 10(2), 103-110, 1995

    Society for the Study of Species Biology

参考文献:  34件中 1-34件 を表示

被引用文献:  1件中 1-1件 を表示

各種コード

  • NII論文ID(NAID)
    110001835529
  • NII書誌ID(NCID)
    AA10726074
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    0913557X
  • データ提供元
    CJP書誌  CJP引用  NII-ELS  IR  NDL-Digital 
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