Effect of Drought Stress on the Photosynthetic Properties and Water Use Efficiency of Ground-cover Chrysanthemum

The photosynthetic properties and water use efficiency were measured under drought stress with pot culture experiments to study the drought resistance of ground-cover chrysanthemum.The results showed that net photosynthetic rate,transpiration rate and stomatal conductance all decreased with the increasing of drought stress,net photosynthetic rate had no obvious difference between light drought stress and the control.The intercellular CO2 concentration decreased under light drought stress,but increased by 30.6% with heavy drought.The water use efficiency increased with drought stress.The water use efficiency under moderate drought stress was 1.34 times compared with the control.The chlorophyll content increased by 6.2% compared with the control under lightly stress,but declined compared with the control under moderate and heavy drought stress.So,Ground-cover chrysanthemum had some adaptability to drought stress.