ISHS Acta Horticulturae 396: Hydroponics and Transplant Production
EFFECT OF ROOT ZONE TEMPERATURES ON THE MINERAL COMPOSITION OF XYLEM SAP, PHOTOSYNTHETIC ACTIVITY AND TRANSPIRATION IN CUCUMBER PLANTS |
| Authors: | K.J. Choi, G.C. Chung, W.Y. Choi, K.P. Han, S.K. Choi |
| Keywords: | Cucumber (Cucumis sativus L.), Xylem sap, Photosynthesis, Transpiration, Root temperature, Anion, Cation |
| Abstract:
Cucumber plants were hydroponically grown under the different solution temperatures (12, 22 and 32± 1°C) in order to understand the influence of root temperature on the mineral composition of xylem sap, photosynthesis and transpiration. The amount of bleeding xylem sap after decapitation of cucumber plants grown in low solution temperature (12 °C) was only one in 18th compared to plants grown in 22 °C, which is considered to be optimum root temperature. High solution temperature (32 °C), however, did not severely affect the amount of bleeding xylem sap. The concentration of anions (NO3- and H2PO4) in xylem sap was significantly low when cucumber plants were grown under 12 °C of solution temperature while cations (K+, Ca2+ and Mg2+) were not severely affected. Accordingly, the ratio of anions/cations became low when cucumber plants were grown under low solution temperature. Transpiration and photosynthesis were also severely reduced by low solution temperature. These facts indicate the disturbance in water, anion absorption and energy metabolism by low root temperature. | |
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