Abstract:

The photosynthetic properties of Mopan Persimmon with different tree age and fruit setting were studied in this article. The results showed that the diurnal course of photosynthetic rate (Pn) of Mopan Persimmon which age was 8 or 15-year were both double-peaked curve with the highest value reached at 10:00 a.m and the second value occurred at 16:00 p.m, but It indicated that the sustained time of midday depression of photosynthesis were different. For the 15-year old Mopan Persimmon trees, the midday depression of photosynthesis occurred at about 13:00 p.m then the Pn increased, but for the 8-year old trees, the sustained time of midday depression of photosynthesis occurred from12:00 to 14:00. The variance analysis results showed that the Pn of 15-year old trees was significant higher than that of 8-year old trees at most moment measured.