• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2001 Fiscal Year Final Research Report Summary

Evolutionary study of one-leaf plants (Gesneriaceae)

Research Project

Project/Area Number 11691195
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section海外学術
Research Field 系統・分類
Research InstitutionJapan Women's University

Principal Investigator

IMAICHI Ryoko  Japan Women's University, Dept. of Chemical and Biological, Professor, 理学部, 教授 (60112752)

Co-Investigator(Kenkyū-buntansha) TSUKAYA Hirokazu  National Institute for Basic Biology, Okazaki, Associate Professor, 助教授 (90260512)
OKADA Hiroshi  Osaka City University, Dept. Botany, Professor, 理学部, 教授 (40089892)
KATO Masahiro  University of Tokyo, Dept. Biological Sciences, Professor, 大学院・理学研究科, 教授 (20093221)
YOSHIDA Akira  Institute of Evolution and Biology, Head Researcher, 主任研究員 (70090933)
Project Period (FY) 1999 – 2001
Keywordsone-leaf plants / Gesneriaceae / Streptocarpus / Monophyllea / morphogenesis / evolution / cotyledon / 子葉
Research Abstract

Monophylly is exhibited in Monophyyllaea and in Streptocarpus (Gesneriaceae). Their plant body consists of a single large cotyledon. They never form stems or foliage leaves throughout their life history, and they produce inflorescences at the base of the cotyledon lamina. This research aims to clarify the evolution of the monophylly based on the molecular phylogenetic analysis and comparative morphogenesis. Research materials include not only anisocotylous Gesnerioideae but also isocotylous Cyrtandroideae. They were collected in Borneo, Malay Peninsula including Thai, Madagascar, South Africa, and Brazil on three botanical expeditions. The embryo of anisocotylous Gesnerioideae remains at the torpedo stage, and during or after seed germination the root apex and then shoot apex are formed from the hypocotyl tip and between the two cotyledons respectively. The shoot apex grows too slow to form the vegetative shoot, and in monophyllous plants a rudimentary meristem called groove meristem b … More ecomes directly the reproductive shoot apex. The groove meristem is considered to be homologous to the shoot apex, not a de novo meristem. The accrescent cotyledon is produced by the prolonged activity of the basal meristem located on the cotyledon base. The evolutionary course of the basal meristem and the underlying mechanism still remains to be solved. However, morphological analysis of caulescent species of Streptocarpus and Chirita shows that there is a similarity in the developmental mode between their large cotyledon and the foliage leaves ; the both leaves grow mainly due to the meristematic cells in the basal portion. Their foliage leaves do not have an apparent plate meristem typical of other dicotyledon-leaves. It seems likely that the suppression of the plate meristem occurred more strongly in their cotyledon than the foliage leaves, resulting in the establishment of the basal meristem in anisocotylous Gesnerioideae. In conclusion, one-leaf plants may have evolved through retardation of the embryogenesis and consequent suppression of the vegetative shoot growth. Less

  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] Imaichi.R., Nagao.S., Kato.M.: "Ontogenetic anatomy of Streptocarpus grandis(Gesneriaceae) with implications for evolution of monophylly"Annals of Botany. 86. 37-46 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tsukaga, H.: "The role of meristematic activities in the formation of leaf blades"Journal of Plant Research. 113. 119-126 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Imaichi.R., Inokuchi.S., Kato.M.: "Developmental morphology of one-leaf plant Morophyllaea sinrulasis(Gesneriaceae)"Plant Systematics and Evolution. 209. 171-185 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 今市涼子: "一葉植物(イワタバコ科)の起源と形態進化"Plant Morphology. 13(印刷中). (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Imaichi, R., Nagumo, S., Kato, M.: "Ontogenetic anatomy of Streptocarpus grandis (Gesneriaceae) with implication for evolution of monophylly"Ann. Bot.. 86. 37-46 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tsukaya, H: "The role of meristematic activities in the formation of leaf blades"J. Plant Res.. 113. 119-126 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Imaichi, R., Inokuchi, S., Kato, M.: "Developmental Morphology of one-leaf plant Monophyllaea singularis (Gesneriaceae)"Plant Syst. Evol.. 229. 171-185 (2001)

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 2003-09-17  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi