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Perception of Light/dark Transitions in Photoperiodic Floral Induction of Crop Plants

Research Project

Project/Area Number 01480043
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 作物
Research InstitutionMie University

Principal Investigator

IKEDA Katsuhiko  INSTITUTION, DEPARTMENT, TITLE OF POSITION : Fac. of Bioresources, Mie Univ., Professor, 生物資源学部, 教授 (80024537)

Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥5,500,000 (Direct Cost: ¥5,500,000)
Fiscal Year 1990: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1989: ¥5,000,000 (Direct Cost: ¥5,000,000)
KeywordsFlower induction / Light / dark transition / Twilight / FR / R ratio / White light / Plant age / Shortening night / Photoperiod-sensitive cultivar / 照度 / 成育相の転換 / 有効日長 / 遠赤色光 / 加齢 / 計時機構
Research Abstract

The present study was designed to secure the information about the mechanism of photoperiodic perception that discriminates between light and darkness and the ecophysiological meanings of daily change in night-length, using a strongly photoperiodsensitive rice cultivar, Norin 18.
1. Effect of twilight at dusk -- During evening twilight on cloudless days, 15 - 20 min had elapsed while the decrease in natural illuminance from the twilight values of 400 - 500 lux to about 30 lux. Therewith, the ratio of far-red (FR) to red (R) light increased from values of about 1.0 to those in the range of 1.2 to 1.4. This decreased illuminance and the increased ratio of FR/R could have natural end-of-day signals coupling to the beginning of photoperiodic dark-time measurement.
2. Experimental approaches with artificial lights -- 1)Dusk-to-dawn lighting of R light at 0.2lmumol/m^2/s could not induce to flower and that of incandescent white light of 30 lux (6 mumol/m^2/s) and above was also the case, sugge … More sting that those irradiance of artificial light failed to act as a dark signal. 2)Exposing plants to incandescent light of low illuminance before entry to non-inductive night close to the critical, flowering did not take place, if removed FR radiation. But the same light of about 30 lux, when contained FR region of the spectrum, was found to be equivalent to photoperiodic darkness. Enriching FR radiation with lowering voltage, without changing the illuminance, the flowering response was enhanced. Incandescent light, even of 300 lux, of which FR/R ratio exceeded 2.0, was effective to promote flowering.
3. Daily change in night length -- Flowering of plants of younger age was favored under lengthening night conditions. On the other hand, shortening dark periods were favorable for flowering of plants of fully responsive age to photoperiod.
We concluded from these observations that the light/dark transition at dusk is sensed by reduction in light quantity as well as by increase in FR/R ratio and that the effects of gradually changing night-length on flowering of rice are dependent on the developmental age of plants. Less

Report

(3 results)
  • 1991 Final Research Report Summary
  • 1990 Annual Research Report
  • 1989 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 池田 勝彦: "水稲の花芽形成に関する研究 23.延長および短縮変化する暗期の花成誘導効果" 日本作物学会紀事. 59(別2). 163-164 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] IKEDA, K.: "Photoperiodic Control Floral Induction in Rice Plant 23. Flower-inductive effect of lengthening versus shortening nights" Japanese Journal of Crop Science. 59(Extra issue 2). 163-164 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 池田 勝彦: "水稲の花芽形成に関する研究 23.延長および短縮変化する暗期の花成誘導効果" 日本作物学会紀事. 59(別2). 163-164 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 池田 勝彦: "水稲の花成誘導における遠赤光の役割" 日本作物学会東海支部会報. 112. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 池田勝彦: "水稲の花成誘導における遠赤色の役割" 日本作物学会東海支部会報. 110. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 池田勝彦: "日長の変化が水稲の花成誘導におよぼす影響" 日本作物学会東海支部会報. 110. (1990)

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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