Improvement of Heat Shock Treatment and Trial Development of Hot Water Sprayer for Inducing Disease Resistance in Cucumber (Cucumis sativus L.)

Yoshino Mioko, Widiastuti Ani, Songying Zhou, Odani Hiromitsu, Hasegawa Morifumi, Sato Tatsuo

doi:10.2503/hrj.11.121

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Other Title

キュウリに病害抵抗性を誘導する熱ショック処理方法の改良と処理装置の試作
キュウリニビョウガイテイコウセイオユウドウスルネツショックショリホウホウノカイリョウトショリソウチノシサク

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This research was conducted to establish a practical method of heat shock treatment to induce disease resistance in cucumber seedlings. To achieve this purpose, short treatment at a higher temperature than in our previous report was tested and a prototype hot water sprayer was developed for treatment. At a result of the hot water dipping test, treatment at 50°C for 20 seconds showed the same effect as 40°C for 120 seconds, which was the optimum condition in the previous experiment for inducing resistance to gray mold (Botritis cinerea). Based on this result, a prototype hot water sprayer was assembled using an LP gas boiler as the main component. A thermal cover was effective for maintaining leaf temperature at 50°C stably. When hot water was used to treat the leaves appropriately using this machine, salicylic acid concentration and the expression level of the peroxidase gene increased in the leaves. An inoculation test of gray mold showed the same protective effect as treatment with saccharine sodium, known as a plant activator. As a result, we concluded that the hot water spray is a possible practical method for inducing disease resistance to grey mold in cucumber seedlings.<br>

Journal

Horticultural Research (Japan)

Horticultural Research (Japan) 11 (1), 121-126, 2012

THE JAPANESE SOCIETY FOR HORTICULTURAL SCIENCE

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