Biologia plantarum 56:566-570, 2012 | DOI: 10.1007/s10535-012-0118-y
Effects of 5-aminolevulinic acid on the H2O2-content and antioxidative enzyme gene expression in NaCl-treated cucumber seedlings
- 1 College of Horticulture and Forestry, Huazhong Agricultural University and Key Laboratory of Horticultural Plant Biology, Ministry of Education, Wuhan, P.R. China
The potential of 5-aminolevulenic acid (ALA) to enhance the salt tolerance of cucumber (Cucumis sativus L.) seedlings was investigated. ALA was applied at various concentrations (0, 1, 10, 25, 50, and 100 mg dm-3) as foliar spray or root watering. Then the seedlings were exposed to 0 or 75 mM NaCl for 5 d. NaCl stress reduced the root and leaf dry masses, leaf area, and the leaf net CO2 assimilation rate. These reductions were counteracted by exogenous ALA, and the most efficient was 50 mg dm-3 concentration via foliar spray. ALA decreased the H2O2 contents and increased the activities of ascorbate peroxidase (APX) and glutathione reductase (GR) in NaCl-treated cucumber roots and leaves and the activity of catalase (CAT) in leaves. The ALA application also up-regulated the expressions of CAT and cAPX genes in roots and leaves and the expression of GR gene in roots of the NaCl treated cucumber plants.
Keywords: ascorbate peroxidase; catalase; Cucumis sativus; gene expression; glutathione reductase; salinity
Subjects: ascorbate peroxidase; catalase; gene expression; glutathione reductase; aminolevulinic acid; hydrogen peroxide; NaCl; PCR; net photosynthetic rate; superoxide dismutase; ascorbate; glutathione
Species: Cucumis sativus
Received: February 23, 2011; Accepted: May 31, 2011; Published: September 1, 2012Show citation
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