NaCI 處理가 벼 幼苗期의 生長,水分 potential 및 光合成에 미치는 影響 = Effect of NaCI on Growth,Water potential and Photosynthesis in Seedling stage of Rice

다국어 초록 (Multilingual Abstract)

This study was conducted to obtain the basic information for the breeding of salt tolerant rice species by meant of measuring the varietal response of salt injury. Among 11 varieties, Namwonbyeo and Seohaebyeo were treated at 0.0(Control), 0.3, 0.6 and 0.9% NaCl concentration, and the other 9 varieties were treated only at control and 0.6% NaCl at the 4th leaf stage in water culture. At 10th day after NaCl treatment, plant hight, dry weight, water content rate, water potential and photosynthesis were investigated and compared with the degree(1-9) of salt injury.
Elongation of the plant height was decreased by 16-33% at 0.3% NaCl, and by 67-70%at 0.6% NaCl treatment, respectively, compared to the control and showed the significant difference among NaCl treatments. These were showed no significant difference among the treatments in the length of the 4th, the 5th and the 6th leaf, and was no significant correlation between the elongation of plant height and the degree of salt injury among varieties at 0.6% treatment.
The dry weight were remarkably inhibited in the higher treatment and showed great difference among the treatments. The dry weight among the varieties showed no difference at the control, hilt showed the difference at the 0.6% treatment. The correlation between the increase of dry weight and the degree of salt injury among varieties had no significant difference at both the control and 0.6% NaCl treatment.
The relative water content in both stem and leaf were decreased with the increase of NaCl concentration and had a significant difference among the treatments. The relative water content had no significant difference among varieties at the control, but showed the difference at 0.6% treatment. the relative water content and the degree of salt injury had significant correlation, and the correlation was higher at 0.6% treatment than at the control.
The leaf water' potential in the 5th leaf at 5 days and the 6th leaf at 10 days after the treatment were significantly decreased as the concentration of NaC3 was increased. The leaf water potential among varieties showed no significant difference at the control, while high significant difference at 0.6% treatment.
At 5th day after the treatment the photosynthesis of 5th leaf showed a significant difference among the treatments regardless of the varieties. And at 10th day after the treatment, it of 6th leaf had a difference in Seohae-byeo but no difference in Namwon-byeo among the treatments. There were no significant difference in the photosynthesis among varieties at the control, while were a high significant difference at 0.6% treatment, and the correlation between the photosyn-thesis and the degree of salt injury was significantly high.
Summing up above results, NaCl treatment inhibited the plant height, dry weight, water con-tent, water potential and photosynthesis in seedling stage of rice. There were a significant correlation between the degree of salt injury and the relative water content, the water potential and the photosynthesis, respectively, at 0.6% NaCl treatment. These results indicated that they could be used as a indicator for the decision of the degree of salt injury in rice plant.