Salicylic acid and heat acclimation pretreatment protects Laminaria japonica sporophyte(Phaeophyceae) from heat stress

作     者：周斌 唐学玺 王悠 

作者机构：Laboratory of EcologyCollege of Marine Life SciencesOcean University of China 

出 版 物：《Chinese Journal of Oceanology and Limnology》 (中国海洋湖沼学报（英文版）)

年 卷 期：2010年第28卷第4期

页      面：924-932页

核心收录：

学科分类：09[农学] 0903[农学-农业资源与环境] 

基　　金：Supported by the Open Funds of the Key Oceanic Science and Engineering Laboratory of National Bureau of Oceanography(MESE-2008-01) the Specialized Research Program for Marine Public Welfare Industry,SOA(No.200805066) 

主　　题：Laminaria japonica salicylic acid heat acclimation thermotolerance oxidative stress antioxidant system 

摘      要：Possible mediatory roles of heat acclimation and salicylic acid in protecting the sporophyte of marine macroalga Laminaria japonica(Phaeophyceae) from heat stress were *** stress resulted in oxidative injury in the kelp *** heat stress significant accumulation of hydrogen peroxide(H_2O_2) and malonaldehyde(MDA),a membrane lipid peroxidation product,and a drastic decrease in chlorophyll a content were *** of the enzymatic antioxidant system was drastically affected by heat *** activity of superoxide dismutase(SOD) was significantly increased while peroxidase(POD),catalase(CAT) and glutathione peroxidase(GPX) were greatly inhibited and,simultaneously,phenylalanine ammonia-lyase was activated while polyphenol oxidase(PPO) was *** heat acclimation pretreatment and exogenous application of salicylic acid alleviated oxidative damage in kelp *** receiving heat acclimation pretreatment and exogenous salicylic acid prior to heat stress exhibited a reduced increase in H_2O_2 and MDA content,and a lower reduction in chlorophyll a *** with heat acclimation and salicylic acid elevated activities of SOD,POD,CAT,GPX and *** these results collectively,we speculate that the inhibition of antioxidant enzymes is a possible cause of the heat-stress-induced oxidative stress in ***,and enhanced thermotolerance may be associated,at least in part,with the elevated activity of the enzymatic antioxidant system.