Abstract
Photosynthetic gas exchange, dry mass production, water relations and inducibility of crassulacean acid metabolism (CAM) pathway as well as antioxidative protection during the C3-CAM shift were investigated in Sedum album and Sedum stoloniferum from Crassulaceae under water stress for 20 days. Leaf relative water content (RWC), leaf osmotic and water potential decreased with increasing water stress in both studied species. Significant reduction in dry matter production and leaf thickness was detected only in S. stoloniferum after 20-d water stress. Δtitratable acidity and phosphoenolpyruvate carboxylase (PEPC) activity in S. album responded to drought at early stages of stress treatment, continued to increase throughout the entire stress period and reached levels 15 times higher than those in well-watered plants. In S. stoloniferum, however, both parameters responded later and after a transient increase declined again. In S. stoloniferum, in spite of increase by drought stress, net night-time CO2 assimilation was negative resembling a C3-like pattern of gas exchange. Catalase (CAT), ascorbate peroxidase (APX), and superoxide dismutase (SOD) activities increased in plants subjected to mild water stress while declined as the stress became severe. Although malondialdehyde (MDA) content was higher in drought-stressed S. stoloniferum, the increase in the concentration of hydrogen peroxide (H2O2) that may act as a signal for C3-CAM transition was higher in S. album compared with S. stoloniferum. In drought-stressed plants, SOD activity showed a clear diurnal fluctuation that was more steadily expressed in S. album. In addition, such pattern was observed for CAT only in S. album. We concluded that temporal and diurnal fluctuation patterns in the activity of antioxidant enzymes depended on duration of drought stress and was related to the mode of photosynthesis and degree of CAM induction. According to our results, S. stoloniferum developed a low degree of CAM activity, e.g. CAM-cycling metabolism, under drought conditions.
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Abbreviations
- APX:
-
ascorbate peroxidase
- CAM:
-
crassulacean acid metabolism
- CAT:
-
catalase
- DM:
-
dry mass
- E :
-
transpiration rate
- g s :
-
stomatal conductance
- H2O2 :
-
hydrogen peroxide
- MDA:
-
malondialdehyde
- PEPC:
-
phosphoenolpyruvate carboxylase
- P N :
-
net photosynthetic rate
- ROS:
-
reactive oxygen species
- RWC:
-
relative water content
- SOD:
-
superoxide dismutase
- Ψs :
-
osmotic potential
- Ψw :
-
water potential
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Habibi, G., Hajiboland, R. Comparison of photosynthesis and antioxidative protection in Sedum album and Sedum stoloniferum (Crassulaceae) under water stress. Photosynthetica 50, 508–518 (2012). https://doi.org/10.1007/s11099-012-0066-y
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DOI: https://doi.org/10.1007/s11099-012-0066-y