Acceleration of Flowering of Eustoma grandiflorum in Early Winter by Day-extension Treatments with Far-red Rich Bulb-type Fluorescent Lamps

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  • Sato Takeyoshi
    Department of Horticultural Experiment Station, Yamagata General Agricultural Research Center Graduate School of Agricultural Science, Tohoku University
  • Kudo Noriko
    Department of Horticultural Experiment Station, Yamagata General Agricultural Research Center
  • Moriyama Takayoshi
    Toshiba Lighting & Technology Corporation
  • Ohkawa Hideki
    Toshiba Lighting & Technology Corporation
  • Kanayama Yoshinori
    Graduate School of Agricultural Science, Tohoku University
  • Kanahama Koki
    Graduate School of Agricultural Science, Tohoku University

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Other Title
  • トルコギキョウの秋冬出し作型における遠赤色光電球形蛍光ランプを利用した日長延長による開花促進
  • トルコギキョウ ノ アキ フユ ダシ サクガタ ニ オケル エンセキショクコウ デンキュウケイ ケイコウ ランプ オ リヨウ シタ ニッチョウ エンチョウ ニ ヨル カイカ ソクシン

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Abstract

Acceleration of flowering of Eustoma grandiflorum in early winter by day-extension treatments with far-red rich bulb-type fluorescent lamps was investigated after culturing short-day treatment was performed from transplant to the end of August, followed by under long-day treatment after the middle of September, which is appropriated for cool area in Japan. Far-red rich bulb-type fluorescent lamps were made for trial purposes and in addition to incandescent lamps and red rich bulb-type fluorescent lamps on the market were used as light sources. As a result, far-red rich bulb-type fluorescent lamps, as well as incandescent lamps, accelerated the flowering and development of flower buds compared to red rich bulb-type fluorescent lamps or intact natural daylength. When the intensity of far-red light exceeded 0.7 μmol·m−2·s−1, lateral flowers of the second order and higher increased, thus, cut flowers volume were enhanced. Furthermore, this promotion was further accelerated by continuous lighting compared to that under 16 h and 12 h photoperiods. These findings indicated that day-extension treatments from the middle term of growth until flowering time with more than 0.7 μmol·m−2·s−1 of far-red light promoted a high production of marketable cut flowers of the Eustoma grandiflorum and the effect was greatest with continuous lighting in early winter during the cool area.<br>

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