Effect of Soil Waterlogging at Three Developmental Stages on Growth, Fruit Yield and Physiological Responses of Oriental Melon (Cucumis melon L. var. makuwa Makino)

摘要

There is a high demand for oriental melons during summer (May to July), At this time of year, the soil is waterlogged due to monsoon in Korea. Plant responses to soil waterlogging was investigated in this experiment. The soil was waterlogged for 1, 3and 5 days during the early vegetative, and late fruit stages. After waterlogging, 02 concentration in soil decreased rapidly and CO_2 concentration increased rapidly, Root viability and leaf net photosynthesis decreased and leaf resistance decreased aswaterlogging duration extended. With waterlogging, leaves turned yellow more rapidly in mature leaves than young leaves. Leaf ethylene production increased with extending waterlogging duration, but then decreased rapidly after waterlogging. The ethyleneproduction in fruits, especially in mature fruits decreased as waterlogging duration increased. The reduction of sugar concentration in fruit was inversely related to waterlogging duration. Extension of waterlogging duration at any plant's developmentalstage decreased the number and weight of marketable fruit and their soluble solids content. Roots of waterlogged plants were thinner and more branched than those of control plants.