Effects of Drought and Rewatering on the Photosynthesis and Chlorophyll Fluorescence of Coronilla varia
In order to disclose the photosynthetic adaptability of Coronilla varia to drought,the effect of continuous drought stress and rewatering on the characteristics of photosynthesis and chlorophyll fluorescence were studied.C.varia was not watered for 18 days,and then rewatered during pot test.The plants growing in the soil with 70％～75％ relative water content (RWC) were taken as control.The parameters of photosynthesis and chlorophyll fluorescence were measured on the 6th,12th,18th day after no-watering and the 3rd day after rewatering.Results showed that the RWC of soil decreased from 75％ to 50％,35％ and 25％ on the 6th,12th and 18th day after the plants were not watered,respectively.The Pn,Gs,Ci,Tr,Fv/Fm,Yield,ETR and qP of leaf significantly decreased on the 12th and 18th day after no-watering,while NPQ significantly increased (P＜0.05).However,F0 didn't significantly increased during drought stress.The most parameters of photosynthesis and chlorophyll fluorescence increased with the stress time going.However,there was no significant difference for all parameters between treatments and control on the 3rd day after rewatering.These results indicated that continuous drought stress influenced the photosynthesis of C.varia,and the severe stress could lead to the damage of photosynthetic reaction center.However,the damage could be repaired soon and the photosynthesis could quickly be back to the level of control after rewatering due to the good adaptability of C.varia to drought stress.
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万方数据
维普
