Effect of day and night temperatures on stem elongation in Chrysanthemum morifolium Ramat.

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  • 昼夜温度がキクの伸長成長に与える影響
  • チュウヤ オンド ガ キク ノ シンチョウ セイチョウ ニ アタエル エイキョウ

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Abstract

Stem elongation in Chrysanthemum morifolium Ramat. ‘Reagan’ subjected to various DIF conditions (+10 DIF(day temperature:25°C/night temperature:15°C), 0 DIF (20/20) -10 DIF(15/25)) was analyzed using an image processing system. Fluorescent lamps provided photosynthetic photon flux (PPF) of 150μmolm-2 s-1 on the canopy level with a 9h photoperiod. Images of five plants were captured and stored every 10 minutes for 6 days. The stored images were analyzed using subpixel estimation with area based pattern matching. It was observed that daily stem elongation in C. morifolium Ramat. ‘Reagan’ responded well to DIF, and that stem elongation rapidly increased shortly after night began under all DIF conditions. This steep rise continued for approximately 60 minutes, and then the slope of the stem elongation decreased slightly. Stem elongation during the day was 0.5 to 1mm under each DIF condition. However, stem elongation was 3mm or more under +DIF condition, while it was only 1.5mm under a -DIF condition during the dark period. It was found that the tendency toward extension growth was almost determined by the tendency of stem elongation during the night.Another interesting phenomenon was that stem elongation was greater under the lower temperature of 15°C at night under a +DIF condition to a high temperature of 25°C at night under a -DIF condition.

Journal

  • Shokubutsu Kankyo Kogaku

    Shokubutsu Kankyo Kogaku 20 (1), 8-13, 2008

    Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists

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