Studies on Leaf Photosynthetic Temperature Characteristics of Wild Rice

Leaf photosynthetic temperature characteristics of wild rice were studied. The results showed that light compensation point of photosynthesis of wild rice un-folding leaves was in the range of 40～(85 μE/(m~2·s)). Light saturation point of their photosynthesis was in the range of 900～(1 040 μE/(m~2·s).) Low temperature compensation point of their photosynthesis was 2～3℃. Over 2～3℃, photosynthesis increased with the increase of temperature, and the maximum value was measured under 30℃, and then it began to decline. The optimum temperature of their photosynthesis was 25～35℃. High temperature compensation point of photosynthesis was at 48～50℃. The respiration rate was 2.5～(4.8 μmol/(m~2·s).) The respiration rate also increased with the increase of temperature, but the maximum value was measured under 43～45℃, then the respiration rate decreased. Apparent quantum yield was in the range of 0.01～0.05. From 15℃ to 35℃, higher ratio of photosynthesis to respiration and apparent quantum yield was measured in wild rice leaves.