ISHS Acta Horticulturae 588: II International Symposium on Cucurbits
ROOT ZONE TEMPERATURE EFFECT IN HYDROPONICALLY GROWN CUCUMBER PLANTS: GROWTH AND CARBOHYDRATE METABOLISM |
| Authors: | S.J. Chung, Y.T. Chun, K.Y. Kim, T.H. Kim |
| Abstract:
To investigate the effect of root zone temperature (RZT) on growth and carbohydrate metabolism in hydroponically grown cucumber plants, growth parameters and major carbon metabolites in plant tissues were analyzed at 2, 4, and 6 weeks after start of the RZT treatment (10°C, 18°C or 26°C). Shoot growth significantly increased with increasing RZT but not root growth until 4 weeks. Root activity at 18°C and 26°C continuously increased throughout the experimental period, while that at 10oC sharply decreased after 4 weeks. Chlorophyll content was less affected by RZT. The amount of hexose phosphate increased as RZT was lowered. Glyceraldehyde-phosphate (PGA) slightly increased within 18°C, but greatly fell down at 26°C RZT. Higher accumulation of soluble sugars was generally observed in both leaves and roots grown at 10°C RZT. Low RZT significantly depressed starch synthesis in leaves, but stimulated starch accumulation in roots. | |
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