Effects of Mixed Saline Stress on Photosynthetic Characteristics and Antioxidant Enzymes Activity of Cassava Seedlings

doi:10.11924/j.issn.1000-6850.casb17090097

Abstract

Abstract: The aim is to study the effects of mixed saline stress on photosynthetic characteristics and antioxidant enzymes of cassava seedling. We chose‘SC8’and‘GR911’as representative test materials and used potted method. The seedlings were treated with mixed saline treatment at 0 (CK), 0.05, 0.1, 0.15 and 0.2 mol/L. With different concentrations of mixed saline, chlorophyll contents, photosynthetic parameters and antioxidant enzymes activity of the cassava seedlings were determined and analyzed. The results showed that the chlorophyll contents in the leaves of‘SC8’and‘GR911’seedling went up first and then dropped under mixed saline stress, reached the highest when NaCl-Na2SO4 concentration was 0.15 mol/L, which was 2.52 and 2.35 mg/g, respectively. The photosynthetic parameters Pn, Tr, Gs, Ci, WUE and Ls increased first and then decreased, and the photosynthetic rate was‘SC8’＞’GR911’under low mixed saline stress, but the difference between‘SC8’and‘GR911’was not significant under high mixed saline stress. The enzyme activities of SOD, POD and CAT in‘GR911’were higher than those in‘SC8’under the same concentration of mixed saline stress. Comprehensive consideration of the effects of NaCl- Na2SO4 stress on photosynthetic indexes and antioxidant enzyme activities of‘SC8’and‘GR911’, NaCl-Na2SO4 tolerance of‘GR911’is higher than that of‘SC8’.

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