Journal
BIOLOGIA PLANTARUM
Volume 56, Issue 4, Pages 780-784Publisher
ACAD SCIENCES CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
DOI: 10.1007/s10535-012-0136-9
Keywords
5-aminolevulinic acid; antioxidant enzyme; Cucumis sativus; heat; proline; soluble sugar
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Cucumber seedlings were pretreated with 3 mu M 5-aminolevulinic acid (ALA) followed by cultivation at normal (25/18 A degrees C) or high (42/38 A degrees C) day/night temperature to investigate the protective effects of ALA on heat stress in plants. Heat elevated the contents of malondiadehyde (MDA), superoxide radical (O-2 (.-)) and hydrogen peroxide (H2O2) in leaves of all plants but less in ALA-pretreated plants. Heat treatment resulted in higher antioxidant enzyme activities and proline and soluble sugar contents and weaker growth inhibition in ALA-pretreated plants than in those treated with heat alone. These results indicate that ALA pretreatment increased the tolerance of seedlings to heat stress.
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