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[1]LIU Jin-song,SHI Hui,LI Yang-yang.Effects of Cd2+ Stress on Photosynthesis and Chlorophyll Fluorescence Characteristics of Cucumber Seedlings[J].Research of Soil and Water Conservation,2011,18(05):187-190,196.

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Effects of Cd²⁺ Stress on Photosynthesis and Chlorophyll Fluorescence Characteristics of Cucumber Seedlings

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 18 Number of periods: 2011 05 Page number: 187-190,196 Column: Public date: 2011-10-20

Title:: Effects of Cd²⁺ Stress on Photosynthesis and Chlorophyll Fluorescence Characteristics of Cucumber Seedlings

Author(s):: LIU Jin-song¹, SHI Hui¹, LI Yang-yang²; 1. School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;
2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China

Keywords:: cadmium stress; cucumber seedling; photosynthesis; fluorescence

CLC:: X592;S642.2;S601

DOI:: -

Abstract:: The effects of different concentrations of cadmium (0, 25, 50, 100, 200 μmol/L) on the photosynthesis and chlorophyll fluorescence characteristics of cucumber seedlings were studied with a solution culture. The results showed that net photosynthetic rate (P_n), stomatal conductance (G_s) and transpiration rate (T_r) greatly decreased but intercellular CO₂ concentration (C_i) showed no change at the 4th day of cadmium stress, relative chlorophyll content only decreased at 200 μmol/L cadmium treatment, while major PSII florescence parameters (the maximal photochemical efficiency of PSII F_v/F_m, the actual photochemical efficiency of PSII in the light Yield and electron transport rate ETR) did not change, indicating a stronger stomatal limitation in the decline of photosynthesis for those treatments with cadmium lower than 200 μmol/L. On the 8th day of cadmium, net photosynthetic rate, stomatal conductance and transpiration decreased more sharply with the increase of intercellular CO₂ concentration (C_i), relative chlorophyll content and major fluorescence parameters except NPQ also decreased, implying a stronger nonstomatal limitation such as decreased chlorophyll content and destroyed PSII primary reaction. The lower value of main fluorescence parameters except NPQ at 50 μmol/L cadmium treatment on the 8th day might be related with serious Fe deficiency caused by cadmium stress.

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