Effects of Exogenous Progesterone on Lipid Peroxidation and Antioxidant Enzymes of Maize Seedlings under High Temperature Stress
XUE Ruili
ZHAO Pengfei
YANG Yanfang
SU Xiaoyu
GAO Mingquan
YANG Li
ZHANG Huanling
ZHAO Huijie?
Abstract：To investigate the effect of exogenous progesterone on the activities of lipid peroxidation and antioxidant enzymes,the seedlings of maize (Zea may cv. Zhuyu 309) were pretreated with 10 -9 mol/L, 10 -7 mol/L,10 -5 mol/L,10 -3 mol/L of progesterone under the high temperature stress. The activities of superoxide dismutase ( SOD) ,catalase ( CAT) ,peroxidase ( POD) ,CAT and POD isozymes,and the ma-londialdehyde ( MDA) content,membrane permeability and chlorophyll fluorescence parameters of maize leaves were assayed. The results showed that,CAT activity of 10 -9 mol/L progesterone pretreatment was 2. 4 times higher than the high temperature treatment,and the activities of SOD and POD of 10 -7 mol/L progesterone pretreatment were 1. 1 times and 1. 2 times higher than the high temperature treatment,re-spectively. In addition,the relative electric conductivity of 10 -9 mol/L and 10 -7 mol/L progesterone pre-treatment decreased to 70% and 65% of the high temperature treatment,respectively; Malondialdehyde contents were also reduced to 69% or 74% of the high temperature treatment,respectively. The expression levels of POD and CAT isozymes of 10 -7 mol/L progesterone treatment elevated,as well as oxygen release rate and chlorophyll fluorescence paraments. This study showed that the pretreatment with 10 -9 mol/L and 10 -7 mol/L progesterone increased the activities of antioxidant enzymes,and decreased the MDA content and the electrolyte leakage rate under high temperature stress,thus to protect the photosynthesis in maize leaves.
Keywords：maize seedlingsprogesteronehigh temperature stressantioxidant enzymeslipid peroxi-dationphotosynthesis
Publication Date：2015-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：5( 25-29 )