Preharvest and postharvest responses of radish to reduced water supply during growth.
Herppich, W. B., Linke, M., Landahl, S. and Gzik, A.
ISHS Acta Horticulturae 553: 89-90.
2001
บทคัดย่อ
The effects of reduced water availability on the growth, photosynthesis, water relations, chemical composition and postharvest wilting responses of radish were investigated in a pot experiment. Control plants were continuously watered at 15-17 ml per plant. For the drought stress treatment, watering was gradually reduced from 15 to 6 ml during a 12-day period. The gravimetric soil water content of the control samples was kept constant at 2.5 plus or minus 0.2 kg/kg. During the drought treatment, however, it decreased 1.4 plus or minus 0.3 kg/kg. Reducing the soil water availability resulted in a slightly reduced water potential. At harvest, the tuber water content was lower in water-deprived radish. The total tuber yield was slightly higher in well-watered plants. Carbon dioxide accumulation was slightly reduced because of stomatal limitations at the end of tuber maturation. The enhancement of sugar and proline contents in response to water stress indicated that the radish tubers adapted osmotically. The surface tissue resistance to water vapour diffusion increased significantly in mature pre-stressed tubers, resulting in a more negative surface water potential, which should reduce the water loss of harvested produce.