Abstract:

The effects of continuous drought stress on white clover(Trifolium repens cv.Haifa) were studied.The results showed that relative water content,net photosynthesis rate, transpiration rate and water utilization efficiency in leaves of white clover decreased significantly with decreases in soil water content .Their curves changed into mono-cusp from dis-cusp during one day.Although stomatal conductance in leaves decreased,but intercellular CO2 concentration increased,so we concluded that photosynthesis of white clover be restricted by non-stomatal cause.