Results (
Thai) 2:
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Hydrogen peroxide (H2O2) is considered a signal molecule inducing cellular stress. Both heat shock (HS)
and Cd can increase H2O2 content. We investigated the involvement of H2O2 in HS- and Cd-mediated
changes in the expression of ascorbate peroxidase (APX) and glutathione reductase (GR) in leaves of rice
seedlings. HS treatment increased the content of H2O2 before it increased activities of APX and GR in rice
leaves. Moreover, HS-induced H2O2 production and APX and GR activities could be counteracted by the
NADPH oxidase inhibitors dipehenylene iodonium (DPI) and imidazole (IMD). HS-induced OsAPX2 gene
expression was associated with HS-induced APX activity but was not regulated by H2O2. Cd-increased
H2O2 content and APX and GR activities were lower with than without HS. Cd did not increase the
expression of OsAPX and OsGR without HS treatment. Cd increased H2O2 content by Cd before it increased
APX and GR activities without HS. Treatment with DPI and IMD effectively inhibited Cd-induced H2O2
production and APX and GR activities. Moreover, the effects of DPI and IMD could be rescued with H2O2
treatment. H2O2 may be involved in the regulation of HS- and Cd-increased APX and GR activities in
leaves of rice seedlings.
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