2011•PLANT PHYSIOLOGYRequires access

Response of Photosynthesis and Chlorophy II Fluorescence Parameters to Different Drought Stress in Cerasus humilis Bunge

Ze Yin

Abstract

In order to study the light response mechanisms of Cerasus humilis under drought stress,leaf gas exchange and chlorophyll fluorescence parameters were measured with mild and severe drought treatment.The results showed that net photosynthesis rate(Pn),transpiration rate(E),water utilization efficiency(WUE),stomatal conductance(Gs) and maximal photochemical efficiency of PSⅡ(Fv/Fm) decreased significantly in seedlings of C.humilis under drought stress.While the values of intercellular CO2 concentration(Ci),non-photochemical quenching coefficient(NPQ) and the ratio of Z+0.5A and V+A+Z increased.These results indicated that the decrease of photosynthetic capacity was attributed to both stomatal limitation and non-stomatal limitation under long drought treatment.The capacity of heat dissipation was improved by initiating of the xanthophyll cycle,which resulted in the protection of the photosynthetic apparatus from the damage of drought stress.

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Key concepts: Photosynthesis, Transpiration, Chlorophyll fluorescence, Stomatal conductance, Xanthophyll, Water-use efficiency, Drought stress, Quenching (fluorescence)