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Physiological and genetic analyzes of population differentiation in plants in relation to life cycle regulation mechanisms.

Research Project

Project/Area Number 07640830
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 生態
Research InstitutionTohoku University

Principal Investigator

ISHIGURI Yoshio  Istitute of Genetic Ecology, Tohoku University, Asistant Professor., 遺伝生態研究センター, 助手 (90006015)

Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1996: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsCardamine flexuosa / Life cycle regulation / Population defferentiation / Photoperiod / Temperature / Genetic analysis / Flowering / Germination / 酵素多型 / 遺伝的類似度 / 花芽形式 / 発芽様式 / 緯度別集団
Research Abstract

(1). We clarified the mechanisms of population differentiation in Cardamine flexuosa (Cruciferae) collected from various habitats in Japan in relation to these characters of life cycle regulation based on developmental and genetic analyzes.
(2). The research was planned on three parts as follow : (i) Photoperiodic requirement for flowering under natural alteration of daylength at Sendai (38.16 N.140.54E), (ii) Physiological analyzes of the life cycle regulation depending on combinations with photoperiods and chilling treatments under completely regulated environments, (iii) Genetic analysis of the populations appeared from similarities of zymograms in various isozymes tested.
(3). Populations located at higher latitude showed tightly a long-day required flowering, meaning to be useful preparing high tolerant individuals for dry and cold conditions in winter. Populations at lower latitude, inversely, showed a size dependent flowering because of relatively mild environmental selective pressure.
(4). Yonakuni population located 24.98 N being the lowest latitude showed very severe regulation whick suppressed the germination with higher temperature refimes. However, no temperature control for germination observed for population located at higher latitude.
(5). Genetic similarities in relation to latitudinal habitats were found in isozyme analysis, especially among populations located beyond 38 N to north which showed strong photoperiodic dependency to flowering. But the same genotypes were also observed in other populations far from the latitude.
(6). In conclusion, the life cycle was regulated in switching growth phase from vegetative to reproductive by photoperiodic response in higher latitude populations, but no control in germination process. On the other hand, it was regulated in switching on or off germinating procedure by temperature in lower latitude populations, but completely no control in developmental switching.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (2 results)

All Other

All Publications (2 results)

  • [Publications] H. Kudoh: "Phenotypic plasticity in age and size at maturity and its effects on the integrated phenotypic expressions of life history traits of Cardamine flexuosa (Cruciferae)" J. Evol. Biol.9. 541-570 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] H. Shibaike: "Population differentiation in floral and life history traints of Oxalis corniculata L (Oxalidaceae) with style length polymorphism" J. Plant Res.109. 315-325 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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