Respiratory Characteristics of Rough Rice under Unsteady Atmospheric Condition

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  • Hu Wenzhong
    Laboratory of Postharvest Science, Division of Bioproduction System Science, Department of Bioproduction Environmental Science, Faculty of Agriculture, Kyushu University
  • Yasunaga Eriko
    Laboratory of Agricultural Process Engineering, Department of Agricultural Engineering, Graduate School of Bioresource and Bioenvironmental Science, Kyushu University
  • Uchino Toshitaka
    Laboratory of Postharvest Science, Division of Bioproduction System Science, Department of Bioproduction Environmental Science, Faculty of Agriculture, Kyushu University
  • Hori Yoshiaki
    Laboratory of Postharvest Science, Division of Bioproduction System Science, Department of Bioproduction Environmental Science, Faculty of Agriculture, Kyushu University

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  • 動的ガス環境下における生籾の呼吸特性
  • ドウテキ ガス カンキョウ カ ニ オケル ナマ モミ ノ コキュウ トクセイ

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Abstract

The respiration rate of rough rice under unsteady atmospheric condition was measured by the pouch method. The effects of the change in gas concentration, temperature and moisture content on respiration rate and respiratory quotient were also examined. Respiration rates of rough rice were greatly repressed under conditions of increase in carbon dioxide concentration and decrease in oxygen concentration at high temperature of 20 and 30℃. Respiratory quotient was almost fixed at over 5.5% oxygen concentration without changing with the temperature. Anaerobic respiration was occurred at less than 5.5% oxygen concentration, in which respiratory quotient increased rapidly. At at mospheric condition, respiration rate of rough rice increased with rise in temperature; especially this increasing tendency was great at high moisture content. Respiratory quotient was also increased with rise in temperature.

動的ガス環境下における生籾の呼吸速度をパウチ法によって測定し，ガス環境，温度および含水率の変化が呼吸速度と呼吸商に及ぼす影響を検討した．その以下のような知見を得た．1）二酸化炭素濃度が増加し，酸素濃度が減少する動的ガス環境下における呼吸速度は高温域の20℃，30℃下で抑制されることが認められた．呼吸商については，酸素濃度5.5％以上で温度によらずほぼ一定で，酸素濃度5.5％以下になると嫌気呼吸を起こして急増した．2）通常大気環境下では呼吸速度は温度が上昇すると呼吸速度が増加し，とくに高含水率では，この増加傾向が大きいことが認められた．3）呼吸商は温度上昇にともない増加することが示された．

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