Monitoring Primary Response to Chilling Stress in Etiolated Vigna radiata and V. mungo Seedlings Using Thermal Hysteresis of Water Proton NMR Relaxation Times
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概要
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Thermal hysteresis of longitudinal relaxation times (T_1) of water protons in hypocotyls of etiolated Vigna radiata and V. mungo seedlings was investigated by pulse nuclear magnetic resonance (NMR) spectroscopy. Various lengths of chilling exposures during a cool-warm cycle between 20 and 0℃ (below 10℃, about 4 h) for the T_1 hysteresis measurement did not cause any visible injury symptoms in hypocotyls. However, the profiles of T_1 hysteresis varied as a result of different chilling exposures. The sums of the T_1 ratio (for detail see Introduction) reflecting T_1 prolongation or shortening upon the warming process were a good quantitative index for the ex-tent of T_1 hysteresis, and the wide dispersion of this value ranging on the "minus" side (T_1 prolongation upon warming) suggested the occurrence of a primary response of cells to chilling stress before obvious visible symptoms occur while the T_1 ratio sums on the "plus" side (T_1 shortening upon warming) corresponded to a response of serious visible injury. Therefore, the sums of the T_1 ratio can be used as a non-destructive diagnostic tool for monitoring the primary event of chilling injury when lacking any visible injury symptoms. The data indicate that the critical temperature for the occurrence of primary response for chilling stress was around 7.5℃ for V. radiata and 12.5℃ for V. mungo.
- 日本植物生理学会の論文
著者
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Iwaya-inoue Mari
Biological Laboratory College Of General Education Kyushu University
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Kaku Shosuke
Biological Laboratory College Of General Education Kyushu University
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