Authors: A Zhen Z L Bie Y Huang Z X Liu M L Fan
Publish Date: 2012/04/17
Volume: 56, Issue: 3, Pages: 566-570
Abstract
The potential of 5aminolevulenic 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 NaCltreated cucumber roots and leaves and the activity of catalase CAT in leaves The ALA application also upregulated 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
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