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KMID : 0903620010420040435
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Journal of the Korean Society for Horticultural Science
2001 Volume.42 No. 4 p.435 ~ p.438
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Effects of Water Stress Induced by Polyethylene Glycol and Root - zone Temperature on Growth and Mineral Contents of Fuji / M.26 Apple
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노희명/Ro, Hee Myong
임명순/박진면/황기성/Yiem, Myoung Soon/Park, Jin Myeon/Hwang, Ki Sung
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Abstract
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The influence of root-zone temperature on the water stressed ´Fuji´/M.26 apple trees induced by polyethylene glycol (PEG) was examined. The shoot growth, leaf water and proline contents, and mineral composition of leaves and roots were measured as a water stress indicator. When PEG-induced osmotic potential (OP) was low, average shoot length and leaf water potential decreased, while proline content increased. However, the effect of PEG-induced OP was not apparent when exposed to 20℃. In contrast, when the root-zone temperature was high, proline content increased. Root-zone temperature significantly increased average shoot length of PEG-untreated trees, but decreased leaf water content of PEG-treated ones. It is noted that PEG-treated trees has significantly lower average shoot length and leaf water content, but showed higher proline content when exposed to 30 and 35℃ as compared with PEG-untreated. There was a significant interaction between root-zone temperature and OP for proline and water content of leaves, but not for average shoot length. Regardless of OP, leaf N content was significantly lower at 25℃ than other temperature treatments. With decreasing OP, the leaves of trees grown at 30 and 35℃ had higher K and lower Ca than those grown at 20 and 25℃. However, the reverse was the case for root K and Ca contents.
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