明暗期の気温がコチョウランのCO_2吸収に及ぼす影響 Effects of Temperature during Light and Dark Periods on CO_2 Absorption of Phalaenopsis Plants

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本研究において製作したチャンバを用いて光合成速度が小さいコチョウランのCO<SUB>2</SUB>吸収速度の日変化を明確に測定することができた.<BR>暗期の気温を25℃とし,明期の気温を20,25,30℃とした場合,明期の気温が低いほど明期のCO<SUB>2</SUB>,吸収速度は大きくなったが,暗期のCO<SUB>2</SUB>吸収速度に差はなかった.一方,明期の気温を25℃として暗期の気温を20,25,30℃とした時のコチョウランのCO<SUB>2</SUB>吸収速度は,明期においては暗期の気温に関わらず処理間に差は認められなかったが,暗期においては気温が低いほど大きく推移した.これらの結果の原因について生理学的な検討を試みた.<BR>CO<SUB>2</SUB>吸収速度が20℃で最大であったのに対して,成長速度が一般に,より高温域に適温を持つといわれていることについて考察を試みた.<BR>本研究によって,コチョウランのCO<SUB>2</SUB>吸収パターンに詳細な検討が可能になったと考えられるが,さらなる理解のためには考察中に述べたような生理プロセス方面からの研究も必要だと考える.

Carbon dioxide absorption rate or net photosynthesis rate of Phalaenopsis, a CAM species, was precisely measured using a chamber built in this study. Environmental controls of the chamber, including irradiance, air temperature, and CO<SUB>2</SUB> concentration, were proved to be accurate. CO<SUB>2</SUB> absorption rate was calculated from changes in CO<SUB>2</SUB> concentration inside the air-tight chamber. A metal-halide high pressure discharge lamp (400 W) was used as a light source. Data acquisition and CO<SUB>2</SUB> control were done by a programmable data logger.<BR>With 32 plants, CO<SUB>2</SUB> absorption rate was measured at 20, 25, and 30°C either during the dark period (12h) or during the light period (12h). When air temperature during the dark period was 25°C, CO<SUB>2</SUB> absorption rate during the light period was highest at 20°C and decreased as temperature increased to 25 and 30°C. When the temperature during the light period was fixed to 25°C, CO<SUB>2</SUB> absorption rate was higher when the temperature was lower, although the rate was the same during the light period. Since, both in light and dark periods, we did not observe differences in CO<SUB>2</SUB>, absorption rates when temperature was the same regardless of the temperature treatments, daily total of CO<SUB>2</SUB> absorption was also higher when treatment temperature was lower.<BR>While the results showed that the CO<SUB>2</SUB> absorption was largest at 20°C, growth rate of <I>Phalaenopsis</I> has been considered to have a peak at a considerably higher temperature than 20°C. We thought that this was because of higher leaf expansion rate at higher temperature than at 20°C, resulting a higher CO<SUB>2</SUB> absorption rate per plant.

収録刊行物

  • 植物工場学会誌

    植物工場学会誌 13(2), 137-142, 2001-06-01

    JAPANESE SOCIETY OF AGRICULTURAL, BIOLOGICAL AND ENVIRONMENTAL ENGINEERS AND SCIENTISTS

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被引用文献:  1件中 1-1件 を表示

各種コード

  • NII論文ID(NAID)
    10012338926
  • NII書誌ID(NCID)
    AN10451761
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09186638
  • NDL 記事登録ID
    5789074
  • NDL 雑誌分類
    ZR3(科学技術--生物学--植物)
  • NDL 請求記号
    Z18-3397
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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