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KMID : 0903620000410040356
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Journal of the Korean Society for Horticultural Science
2000 Volume.41 No. 4 p.356 ~ p.360
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Effect of Soluble Silicon on the Severity of Powdery Mildew (Sphaerotheca fuliginea) in Cucumber Leaves
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박종한/Park, Jong Han
김선규/이중섭/임명순/Kim, Seon Kyu/Lee, Jung Sup/Yiem, Myeong Sun
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Abstract
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The mobility and deposition of silicon (Si) in cucumber plants grown in hydroponic culture were studied using scanning electron microscope and energy dispersive X-ray analyser under conditions of powdery mildew fungus infection. After transfer to Si containing solution, plants grown in the absence of Si showed rapid silicification of leaf tissue, primarily in the trichome bases. These plants also exhibited increased disease resistance to powdery mildew and showed high concentration of Si in the leaf epidermis. Accumulation of Si in cucumber leaves was high in 24-48 hours after Si treatment, and the accumulation was slightly increased afterward. When the plants grown in Si-supplemented media were transferred into Si-deficient media, residual Si was detected in the leaf trichome bases, but there was no disease resistance of host tissue surrounding the invading pathogen. Deposited Si in intracellular area or cell wall is not remobilized in cucumber plants, where transfer of plants from +Si to -Si led to low Si levels in the subsequent growth.
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