Effect of overnight temperature on leaf photosynthesis in seedlings ofSwietenia macrophylla King

  • Zhang Cheng-Jun
  • Carlos Henrique B. de A. Prado
  • Zu Yuan-Gang
  • Guo Jia-Qiu
  • Carlos Cesar Ronquim
  • Leonnardo Lopes Ferreira


After exposure of one-year old seedlings ofSwietenia macrophylla to an overnight temperature (13°C, 19°C, 25°C, 31°C or 35°C), the leaf net photosynthetic rate (P n) was researched through measuring photosynthetic light-response curves at 360 μmol·mol−1 CO2, and photosynthetic CO2-response curves at light-saturated intensity (1500 μmol·m−2·s−1). The optimal temperature for photosynthesis measured at 360 μmol·mol−1 CO2 was from 25°C to 31°C, but which was from 31°C to 35°C at saturating CO2 concentration. At temperature of below 25°C, the decline inP n was mainly due to the drop in carboxylation efficiency (C e), while as temperature was over 31°C, the reduction inP n resulted from both decrease inC e and increase in leaf respiration. The CO2-induced stimulation of photosynthesis was strongly inhibited at temperatures below 13°C. The results showed that, the leaf photosynthesis of tropical evergreen plants should not be accelerated at low temperature in winter season with elevated CO2 concentration in the future.


Apparent quantum yield Carboxylation efficiency CO2-induced stimulation Swietenia macrophylla King Leaf temperature 

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Copyright information

© Northeast Forestry University 2003

Authors and Affiliations

  • Zhang Cheng-Jun
    • 1
  • Carlos Henrique B. de A. Prado
    • 2
  • Zu Yuan-Gang
    • 1
  • Guo Jia-Qiu
    • 3
  • Carlos Cesar Ronquim
    • 2
  • Leonnardo Lopes Ferreira
    • 2
  1. 1.Key Laboratory of Forest Plant EcologyNortheast Forestry UniversityHarbinP. R. China
  2. 2.Laboratory of Plant Physiology, Department of BotanyFederal University of Sao CarlosBrazil
  3. 3.The Second Affiliated Hospital of Harbin Medical UniversityHarbinP. R. China

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