Effect of soil drought on the growth and water use efficiency of seabuckthorn

Pot-cultured seabuck thorn seedling's growth,photosynthesis and water relations under soil water stress were researched.The main results showed that:transpiration rate (Tr) declined with the deepening of soil water stress,while the diurnal change of Tr had little change.They all displayed parabolic shape,which peak value was at 11:00.The decreasing range of water content,water potential,osmotic potential and turgor were smaller,and leaf growth rate of side shoot and photosynthesis rate (Pn) in a higher level under light stress and medium water stress,which showed the typical physiological character belonging to drought-enduring plant.Serious soil water stress made above index fell remarkably and 33.3% seabuckthorn seedlings died after long term drought stress.