Title page
Contents
Abbreviations 10
Abstract 11
Ⅰ. Introduction 13
Ⅱ. Materials and Methods 16
1. Plant culture and growth conditions 16
2. Treatment conditions 17
3. Measurement of root water uptake 20
4. Chlorophyll fluorescence 22
5. Leaf relative water content 23
6. Chlorophyll determination 24
7. Statistics 25
Ⅲ. Results 26
1. Condition of the optimal control 26
2. Visual symptoms 29
3. Chlorophyll fluorescence 32
4. Root water uptake 38
5. Leaf relative water content (RWC) 45
6. The light-induced greening of etiolated plants 48
Ⅳ. Discussion 51
Ⅴ. Conclusion 57
References 59
국문초록 64
감사의 글 66
Fig. 1. A simplified view of the major design of this research. 19
Fig. 2. Guttation in leaves from rice seedling grown for 7 days old after seeding. The dewdrops located at the tips of the leaves in the early morning. Plants that develop root pressure produce liquid droplets on the edges of their leaves. This... 21
Fig. 3. Chlorophyll fluorescence (Fv/Fm) in the plant leaves after 0-30 min of dark adaptation at the different growth. Each point represents the average of five measurements on different individual plant. Standard... 28
Fig. 4. Plant photographs of visual symptoms after 1-5 days NaCl treatments and 4-8 days recovery. For one example, when treatment period was 1 day, recovery periods were 8 days, and the sum of these of treatment and... 30
Fig. 5. The effects of external NaCl on leaf chlorophyll fluorescence (Fv/Fm) in the rice plants after 8 days recovery with distilled water following 1 day exposure to NaCl. Plants were first grown for 9 days. After that, they were placed in... 33
Fig. 6. The effects of external NaCl on leaf chlorophyll fluorescence (Fv/Fm) in the rice plants after 7 days recovery with distilled water following 2 days exposure to NaCl. Plants were first grown for 9 days. After that, they were placed in... 34
Fig. 7. The effects of external NaCl on leaf chlorophyll fluorescence (Fv/Fm) in the rice plants after 6 days recovery with distilled water following 3 days exposure to NaCl. Plants were first grown for 9 days. After that, they were placed in... 35
Fig. 8. The effects of external NaCl on leaf chlorophyll fluorescence (Fv/Fm) in the rice plants after 5 days recovery with distilled water following 4 days exposure to NaCl. Plants were first grown for 9 days. After that, they were placed in... 36
Fig. 9. The effects of external NaCl on leaf chlorophyll fluorescence (Fv/Fm) in the rice plants after 4 days recovery with distilled water following 5 days exposure to NaCl. Plants were first grown for 9 days. After that, they were placed in... 37
Fig. 10. Effects of increasing NaCl concentration in exogenous culture solution on root water uptake after 1 day exposure to NaCl and remained for 8 days recovery with distilled water. Plants were first grown for 9 days. After that, they were... 40
Fig. 11. Effects of increasing NaCl concentration in exogenous culture solution on root water uptake after 2 days exposure to NaCl and remained for 7 days recovery with distilled water. Plants were first grown for 9 days. After that, they were... 41
Fig. 12. Effects of increasing NaCl concentration in exogenous culture solution on root water uptake after 3 days exposure to NaCl and remained for 6 days recovery with distilled water. Plants were first grown for 9 days. After that, they were... 42
Fig. 13. Effects of increasing NaCl concentration in exogenous culture solution on root water uptake after 4 days exposure to NaCl and remained for 5 days recovery with distilled water. Plants were first grown for 9 days. After that, they were... 43
Fig. 14. Effects of increasing NaCl concentration in exogenous culture solution on root water uptake after 5 days exposure to NaCl and remained for 4 days recovery with distilled water. Plants were first grown for 9 days. After that, they were... 44
Fig. 15. The effects of different NaCl concentrations on leaf relative water content (RWC) in the rice seedlings; 1D stress, 1+8 (1 day salt-stressed and 8 days recovery); 2D, 2+7; 3D, 3+6; 4D, 4+5; 5D, 5+4 treatments. Plants were first grown for 9 days.... 46
Fig. 16. Comparison with the effects of leaf RWC in realations between treatment duration and NaCl concentrations. Plants were first grown for 9 days. After that, they were placed in culture solution treated with 300 and 500 mM NaCl for 3 and 4 days each,... 47
Fig. 17. The effects of different NaCl concentration on the light-induced greening of etiolated plants following salt stress durations between 1 and 5 days and remained in water solution further until they were grown for 9 days. The... 50