ISHS Acta Horticulturae 588: II International Symposium on Cucurbits
ROOT ZONE TEMPERATURE EFFECTS ON NITRATE ASSIMILATION AND XYLEM TRANSPORT IN HYDROPONICALLY GROWN CUCUMBER PLANTS |
| Authors: | T.-H. Kim, Y.-T. Chun, K.-Y. Kim, S.-J. Chung |
| Abstract:
Root zone temperature (RZT) effects on nitrate assimilation and xylem transport was investigated in hydroponically grown cucumber plants. The composition of major nitrogenous metabolites in xylem sap and plant tissues was analyzed at 2, 4, and 6 weeks after RZT treatments at 10°C, 18°C or 26°C. In roots, after 6 weeks at 10°C, nitrate concentration was at least 2 fold higher than in roots grown at 18°C or 26°C. In leaves, nitrate tended to increase with increasing RZT. In xylem exudates from plants grown at 10°C, total N and nitrate were significantly lower than in plants grown at 18°C and 26oC°C. These results suggested that long term exposure to low RZT induced nitrate accumulation in roots and inhibited N transport via xylem. | |
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