Differentiation Patterns of Reproductive Systems in the Genus Trillium(<SPECIAL ISSUE>US-JAPAN SEMINAR : EVOLUTIONARY STUDIES ON SEXUAL SYSTEMS IN PLANTS) :

• OHARA,MASASHI

  Laboratory of Industrial Crops, Faculty of Agriculture, Hokkaido University

• KAWANO,SHOICHI

  Department of Botany, Faculty of Science, Kyoto University:Institute of Genetic Ecology, Tohoku University

• UTECH,FREDERICK H.

  Section of Botany, Carnegie Museum of Natural History

抄録

The differentiation patterns of reproductive systems, including breeding and pollination systems, and perennation strategies of the genus Trillium were critically studied. The pedicellate- and sessile-flowered species with different floral morphologies and ecological distributions exhibited distinct modes of reproductive systems in relation to their habitat conditions. The pedicellate-flowered species occurring in stable mesic temperate deciduous forests reproduce exclusively by seeds, while sessile-flowered species growing in the alluvial flood plain habitats depend to a large extent on vegetative reproduction to compensate for the insufficient sexual reproduction under ecologically unstable conditions, e. g., frequent disturbance due to flooding. These sessile-flowered species are characterized by low ovule numbers, subsequent low seed outputs and low fecundity levels. In contrast to the sessile-flowered species, the pedicellate-erect-flowered species showed very high seed setting rates of over 50%. Breeding experiments for four Japanese species suggest that, although they substantially possess the capability of both inbreeding and outbreeding, the high fecundity levels are maintained by predominant inbreeding system. Furthermore, resource levels in the stock organs of these species obviously determine fecundity levels. As a consequence the amount of reserved food in the rhizomes transferred to the next season is determined, which gurantees a continuous reproductive activity of a given individual plant.

収録刊行物

• Plant species biology

  Plant species biology 5 (1), 73-81, 1990-09-30

  Society for the Study of Species Biology

キーワード

• breeding system
• life history
• reproductive system
• resource limitation
• Trillium

詳細情報

• CRID: 1541417145239031552
• NII論文ID: 110001835427
• NII書誌ID: AA10726074
• Web Site: http://dl.ndl.go.jp/info:ndljp/pid/10484959
• 本文言語コード: en
• データソース種別:
  • NDL-Digital
  • CiNii Articles