PJB-2016-105
NACL SALINITY-INDUCED CHANGES IN GROWTH, PHOTOSYNTHETIC PROPERTIES, WATER STATUS AND ENZYMATIC ANTIOXIDANT SYSTEM OF NITRARIA ROBOROWSKII KOM
YAN LU, JIAQIANG LEI AND FANJIANG ZENG*
Abstract
In pot experiments, 1-year-old Nitraria roborowskii Kom plants were planted under control and four levels of NaCl. The plant growth, Na+ and K+ contents, maximal efficiency of photosystem II photochemistry (Fv/Fm), water potential, antioxidative enzyme activities and contents of photosynthetic pigments, relative water, soluble sugars, proline, hydrogen peroxide (H2O2), and malondialdehyde (MDA) in leaves were measured after 90 days of NaCl treatments. N. roborowskii showed tolerance to medium salinity (50 mM NaCl), whereas growth reduction in biomass was observed when ≥ 100 mM NaCl solutions were used for irrigation. Extreme salinity (400 mM NaCl) hardly impacted Fv/Fm, but a marked decreased in chlorophyll content was observed. A gradual decline of the leaf relative water content and water potential with increased NaCl feeding level was accompanied by increased Na+ accumulation. The total proline and soluble sugar contents were not significantly affected by low salinity (50 mM NaCl); however, both of these values decreased gradually at high salinities (≥ 100 mM NaCl). MDA and H2O2 were not markedly affected at low salinity (50 mM NaCl), but both of these values remarkably accumulated at high salinities (≥ 100 mM NaCl). Superoxide dismutase (SOD), guaiacol peroxidase (POD) and catalase (CAT) presented the same variation trends, first increasing with concentrations of 100, 50 and 100 mM NaCl, respectively, and then decreasing compared to the control, whereas APX increased under all NaCl concentrations.
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