CO2 상승처리가 복숭아 ‘미홍’의 수체생육 및 생리반응에 미치는 영향

This study was conducted to investigate the effect of elevated carbon dioxide on the growth and physiological responses of peach ‘Mihong’ (Prunus persica). We simulated three different carbon dioxide conditions based on climate change scenarios RCP 8.5 in the sunlight phytotron rooms from April 22 to July 6, 2020; 400 μmol·mol -1 (present condition), 700 μmol·mol -1 treatment(expecting carbon dioxide concentrations in mid-21st century), 940 μmol·mol -1 treatment (expecting carbon dioxide concentrations in late 21st century). The average of maximum photosynthesis rate at 700 μmol·mol -1 (16.06 μmol·CO2·m -2 ·s -1 ) was higher than those at 400 μmol·mol -1 (14.45 μmol·CO2·m -2 ·s -1 ) and 940 μmol·mol -1 (15.96 μmol·CO2·m -2 ·s -1 ) from May 22 to July 2. However, stomatal conductances at 700 μmol·mol -1 and 940 μmol·mol -1 were lower than those at the control. Also, the carbon dioxide saturation point in all treatments was reduced from 1,200 μmol·mol -1 in the early stage of growth to 600－800 μmol·mol -1 in the late stage of growth. The stomatal densities were decreased as carbon dioxide increased. The shoot lengths were decreased while the carbon dioxide was increased, but the increase of trunk diameter and leaf areas, shoot numbers were not statistically different. The fruit weight at 700 μmol·mol -1 (152.5 g) was higher than those at the control(141.8 g) and 940 μmol·mol -1 (147.4 g). The soluble solids were higher at 700 μmol·mol -1 , 940 μmol·mol -1 compared to the control. These results suggest that a carbon dioxide elevated to 700 μmol·mol -1 in the future may give a positive effect on the yield and fruit quality of peach ‘Mihong’ while a carbon dioxide elevated above 940 μmol·mol -1 may affect negatively such as early senescence and loss of fruit set.