Influence of salt stress on ecophysiological parameters of Periploca sepium bunge

J.K. Sun, T. Li, J.B. Xia, J.Y. Tian, Z.H. Lu and R.T. Wang
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J.K. Sun: Institute of Restoration Ecology, China University of Mining and Technology, Beijing, P.R. China
T. Li: Shandong Provincial Key Laboratory of Eco-Environmental Science for Yellow River Delta, Binzhou University, Binzhou, P.R. China
J.B. Xia: Shandong Provincial Key Laboratory of Eco-Environmental Science for Yellow River Delta, Binzhou University, Binzhou, P.R. China
J.Y. Tian: Shandong Provincial Key Laboratory of Eco-Environmental Science for Yellow River Delta, Binzhou University, Binzhou, P.R. China
Z.H. Lu: Institute of Restoration Ecology, China University of Mining and Technology, Beijing, P.R. China
R.T. Wang: Institute of Restoration Ecology, China University of Mining and Technology, Beijing, P.R. China

Plant, Soil and Environment, 2011, vol. 57, issue 4, 139-144

Abstract: An experiment was carried out to investigate the effect of salt stress on Periploca sepium Bunge seedlings using three levels of salinity, 50 mmol/L, 100 mmol/L, and 200 mmol/L sodium chloride (NaCl) solution. The results showed that growth parameters and net photosynthetic rate (Pn), stomatal conductance (Gs) of Periploca sepium Bunge were enhanced under low salinity levels (50 mmol/L NaCl), which reduced strongly with increasing salinity levels. Under 100 mmol/L NaCl and 200 mmol/L NaCl stress, the decline of Pn was mainly caused by non-stomatal factors. The water use efficiency (WUE), apparent light use efficiency (LUE), carboxylation efficiency (CUE) were enhanced under low salinity levels (50 mmol/L NaCl), the maximum value of WUE was observed at 100 mmol/L NaCl, the minimum value of WUE was observed at 200 mmol/L NaCl, the LUE, CUE were reduced by 52% and 47%, at 200 mmol/L NaCl, respectively, compared to control. Activities of the antioxidative enzymes superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) were enhanced by low salinity treatment (50 mmol/L NaCl), but CAT activity decreased at 200 mmol/L NaCl stress. Malondialdehyde (MDA) was non-significant compared to the control under low salinity levels (50 mmol/L NaCl), the maximum value was observed at 200 mmol/L NaCl. These results suggest a possibility to improve saline soil utilization of Periploca sepium Bunge in Yellow River Delta region.

Keywords: salinity; growth; gas exchange; protective enzyme; lipid peroxidation (search for similar items in EconPapers)
Date: 2011
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:57:y:2011:i:4:id:227-2010-pse

DOI: 10.17221/227/2010-PSE

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