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《Forest By-Product and Speciality in China》 2019-06
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Effects of Drought and Rehydration on the Growth and Photosynthetic Physiological Characteristics of Salix matsudana

Guan Jian;Gu Lin;Liu Junxiang;Liaoning Vocational College of Ecological Engineering;Research Institute of Forestry, Chinese Academy of Forestry,Key Laboratory of Tree Breeding and Cultivation, National Forestry and Grassland Administration;  
The growth and photosynthetic physiological responses of Salix matsudana under drought-rewatering conditions were studied by potted water control method to determine the replying strategies of Salix matsudana to drought stress, and to reveal the adaptability mechanism of Salix matsudana to drought-rehydration. The results showed that the drought stress caused the leaves of Salix matsudana to fall off, the growth of shoots and roots was significantly inhibited, and the gas exchange parameters and actual photochemical efficiency of leaves decreased significantly with the increase of drought stress. After 12 days of severe drought treatment, the net photosynthetic rate(P_n), The transpiration rate(T_r), stomatal conductance(G_s), and intercellular CO_2 concentration(C_i) were significantly lower than the control by 78.45%, 85.04%, 90.08%, and 16.13%, respectively. The actual photochemical efficiency(ΦPSII) was significantly lower than the control by 22.90%. Under drought stress, the Salix matsudanas showed the characteristics of water plants, and carbon starvation was the main cause of drought damage. After rewatering, the restoration of Salix matsudana growth was affected by the intensity of drought stress. After severe drought, the number of leaves increased explosively, while root growth failed to return to the control level. The recovery of stomatal conductance, transpiration rate and intercellular CO_2 concentration was negatively regulated by drought stress intensity. The moderate drought treatment recovered 8 days after rehydration, while the recovery of severe drought treatment lags 12 days after rehydration. Different from the other three parameters, the net photosynthetic rate of each treatment can be restored to the control level 4 days after rehydration. The recovery of photosynthesis rate in the leaves of Rehydra edulis after drought does not depend on the release of stomatal limitation, but is determined by the physiological compensation of non-stomatal limiting factors such as actual photochemical efficiency.
【Fund】: 中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2018SY003);; 国家自然基金项目(31600489)
【CateGory Index】: S792.12
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