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Responses in Osmolyte Accumulation to Chilling Stress in Cucurbits Plants  

Kang, Nam-Jun (Protected Horticulture Experiment Station, NHRI, RDA)
Cho, Myeong-Whan (Protected Horticulture Experiment Station, NHRI, RDA)
Choi, Young-Hah (Protected Horticulture Experiment Station, NHRI, RDA)
Um, Yeong-Cheol (Protected Horticulture Experiment Station, NHRI, RDA)
Publication Information
Journal of Bio-Environment Control / v.16, no.4, 2007 , pp. 303-308 More about this Journal
Abstract
An accumulation levels of osmolytes in chilling-tolerant and chilling-sensitive cultivar of Cucurbits against chilling stress were determined during chilling stress. Total soluble sugar contents in tolerant cultivar did not changes fur 10 days after chilling stress, but then slightly increased 20 days after chilling stress. In sensitive cultivar, it was increased rapidly in the beginning of chilling stress, and increased 3.4 times as much 20 days after chilling stress as compared with unstressed plants. Proline contents in tolerant cultivar was rapidly increased by the beginning of chilling stress, and then increased 26.6 times 20 days after chilling stress as compared with unstressed plants. In sensitive cultivar, it was increased 22.0 times 20 days after chilling stress as compared with unstressed plants. A levels of glycine betaine (GB) in tolerant cultivar increased 1.9 times as much during the 20 days of chilling stress. However, concentration of GB in sensitive cultivar did not change during the chilling stress. When plants were treated exogenous GB as a foliar spray, chilling tolerance was significantly enhanced in both cultivars. The foliar application of exogenous GB was induced chilling tolerance by accumulation of GB in the plant organs. However, it does not accumulate endogenous proline.
Keywords
chilling stress; glycine betaine; proline;
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