Effect of Sodium Chloride on Growth, Gas Exchange, Protective Enzyme of Periploca Sepium Bunge
Periploca sepium Bunge. was tested for salinity tolerance in pot experiments using three levels of salinity, 50, 100, and 200mmol/L.It was observed that the plant growth parameters and net photosynthetic rate (Pn), stomatal conductance (Gs) were enhanced under low salinity levels (50mm/L NaCl.),which reduced strongly with increasing salinity levels. Under 100mmol/L NaCl and 200mmol/L NaCl stress, the decline of Pn was mainly caused by non-stomatal factors.The water use efficiency (WUE), apparent light use efficiency (LUE) , apparent CO2 use efficiency (CUE) were enhanced under low salinity levels (50mm/L NaCl.), the maximum WUE was observed at 100mmol/L NaCl, the minimum WUE was observed at 200mmol/L NaCl, the LUE, CUE were reduced repectively by 52%,47% at 200mmol/L NaCl compared to control.Activities of the antioxidive enzymes superoxide dismutase (SOD), peroxidase (POD),and catalase (CAT) were enhanced by salts treatment (50mm/L NaCl.), but CAT activity decreased under 200 mmol/L NaCl salt stress. Malondialdehyde (MDA) concentration was non-significant versus the control under low salinity levels (50mm/L NaCl.),the largest concentration exposing to 200 mmol/L NaCl. These results suggest a possible use of Periploca sepium Bunge in Yellow River Delta regions,where salinity is often the common major abiotic stress for plants.
J. K. Sun et al., "Effect of Sodium Chloride on Growth, Gas Exchange, Protective Enzyme of Periploca Sepium Bunge", Key Engineering Materials, Vol. 500, pp. 130-135, 2012