Hydrogen peroxide acts as a signal molecule in CO2 laser pretreatment-induced osmotic tolerance in wheat seedling

Z.B. Qiu, Q. Li, Z.Z. Bi and M. Yue
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Z.B. Qiu: College of Life Science, Henan Normal University, P.R. China
Q. Li: College of Life Science, Northwest University, Xi'an, P.R. China
Z.Z. Bi: College of Life Science, Henan Normal University, P.R. China
M. Yue: College of Life Science, Northwest University, Xi'an, P.R. China

Plant, Soil and Environment, 2011, vol. 57, issue 9, 403-408

Abstract: The objective of this study was to test whether hydrogen peroxide (H2O2) is involved in laser pretreatment-induced water tolerance in wheat seedlings due to its nature as a second messenger in stress responses. The results showed that 3 min laser pretreatment could enhance water tolerance in wheat seedlings by decreasing the concentration of malondialdehyde (MDA), the production rate of superoxide radical (O2-), and increasing the activities of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), ascorbate peroxidase (APX) and glutathione reductase (GR) and the concentration of glutathione (GSH), and having a positive physiological effect on the growth of osmotic stress seedlings. But the promotive effect of laser pretreatment-induced water tolerance in wheat seedling was effectively reversed by addition of 2 mmol AsA (ascorbic acid) or 5 µmol DPI (diphenyle iodonium), but exogenous 100 U/mL CAT could not reversed laser pretreatment-induced protective effect on wheat seedlings under osmotic stress. The results suggest that H2O2 metabolism was involved as signal in the processes of laser-induced water acclimation and laser-induced protective effect was shown to be likely related to NADPH oxidase-dependent H2O2 production.

Keywords: laser; osmotic stress; lipid peroxidation; antioxidative system (search for similar items in EconPapers)
Date: 2011
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:57:y:2011:i:9:id:271-2010-pse

DOI: 10.17221/271/2010-PSE

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