Factors Causing the Variation in the Temperature Coefficient of Dark Respiration in Rice (Oryza sativa L.)

概要

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The temperature coefficient (Q_<10>) of dark respiration in rice gradually decreased in continuous darkness, fluctuating as the circadian rhythmic variation in dark respiration. The solar radiation (MJ m^<-2>) on the day of measurement and the nitrogen concentration in the culture solution hardly affected the Q_<10> value. However, the plants exposed to high-intensity light (260W m<-2>) for two weeks showed a higher Q_<10> of dark respiration than those exposed to low-intensity light (70W m^<-2>). The seasonal variation in Q_<10> value was not observed. The average Q_<10> value during the growth stage measured at 15 to 25℃, 20 to 30℃, and 25 to 35℃ was 2.14, 1.76, and 1.56, respectively. High crop yield in the regions where the day / night temperature difference is large may be partly explained by the high Q_<10> at low night temperature. Thus, the Q<10> may be an important physiological factor determining high crop yield.
日本作物学会の論文