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

Abstract

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.

Keywords

Apparent quantum yield / Carboxylation efficiency / CO₂-induced stimulation / Swietenia macrophylla King / Leaf temperature / Q945.11 / A

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