Salicylic acid and heat acclimation pretreatment protects Laminaria japonica sporophyte (Phaeophyceae) from heat stress |
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Authors: | Bin Zhou Xuexi Tang You Wang |
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Institution: | (1) School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240, People’s Republic of China;(2) College of Landscape and Art, Jiangxi Agricultural University, NanChang, 330045, Jiangxi, People’s Republic of China; |
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Abstract: | Possible mediatory roles of heat acclimation and salicylic acid in protecting the sporophyte of marine macroalga Laminaria japonica (Phaeophyceae) from heat stress were studied. Heat stress resulted in oxidative injury in the kelp blades. Under heat stress
significant accumulation of hydrogen peroxide (H2O2) and malonaldehyde (MDA), a membrane lipid peroxidation product, and a drastic decrease in chlorophyll a content were recorded. Activity of the enzymatic antioxidant system was drastically affected by heat stress. The 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 inhibited. Both heat acclimation pretreatment and exogenous application of salicylic acid alleviated oxidative damage
in kelp blades. Blades receiving heat acclimation pretreatment and exogenous salicylic acid prior to heat stress exhibited
a reduced increase in H2O2 and MDA content, and a lower reduction in chlorophyll a content. Pretreatment with heat acclimation and salicylic acid elevated activities of SOD, POD, CAT, GPX and PPO. Considering
these results collectively, we speculate that the inhibition of antioxidant enzymes is a possible cause of the heat-stress-induced
oxidative stress in L. japonica, and enhanced thermotolerance may be associated, at least in part, with the elevated activity of the enzymatic antioxidant
system. |
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