ISHS Acta Horticulturae 629: XXVI International Horticultural Congress: The Future for Medicinal and Aromatic Plants
STUDIES ON THE PHOTOSYNTHETIC CHARACTERISTICS OF GINGER |
| Authors: | K. Xu, Y.Y. Guo, X.F. Wang |
| Keywords: | Single leaf photosynthesis, canopy photosynthesis, temperature, soil water, CO2 concentration, light |
| Abstract:
The results of this experiment showed that the photosynthetic rate of “Laiwu Big Ginger” was higher than that of “Laiwu Small Ginger”; the photosynthetic rate of leaves at 11th-12th nodes was higher than that of the leaves at 3rd-4th nodes, and it was lowest at top leaves. The dynamic of photosynthetic rates of single leaf and canopy showed mono-peak curves during the whole growth stage of ginger. The heavy midday depression of photosynthesis was observed in single leaf at both leaf vigorous growth stage and rhizome vigorous growth stage. However, no midday depression of canopy photosynthesis was noted at rhizome vigorous growth stage, maximum photosynthetic rate occurring around 13:00, but midday depression of canopy photosynthesis occurred at leaf vigorous growth stage. The results also indicated that the optimal PFD of photosynthesis for single leaf was about 1290 µmol•m-2•s-1, but 1950 µmol•m-2•s-1 for canopy. Nevertheless, CO2 concentration for single leaves and canopy photosynthesis of ginger was similar, about 1500 µl•l-1. Moreover, the optimal temperature and soil water content for photosynthesis of ginger were 25-30 C° and 75 %, respectively. | |
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