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EFFECTS OF SALICYLIC ACID AND METHYL JASMONATE ON PHYSICOCHEMICAL PROPERTY AND GENE EXPRESSION OF GRACILARIOPSIS LEMANEIFORMIS UNDER HEAT STRESS
Author(s): 
Pages: 1132-1138
Year: Issue:  5
Journal: Oceanologia et Limnologia Sinica

Keyword:  Gracilariopsis lemaneiformissalicylic acidmethyl jasmonateheat stressgene expression;
Abstract: Salicylic acid(SA) and methyl jasmonate(MJ) are two new types of phytohormone which can resist effectively in adverse environments. In this study, the effects of SA and MJ on growth, proline and MDA contents, activities of SOD, CA and NR, and 4 relevant gene expressions in high-temperature-cultured Gracilariopsis lemaneiformis, were investigated. Results showed that 100μmol/L SA(SA100), 50μmol/L MJ(MJ50), and 50μmol/L SA+25μmol/L MJ(SA50/MJ25) experimental groups could promote notably the algal growth by 1.78, 1.65, and 1.29 times compared to the control, respectively. Proline contents were enhanced in all the three treatments, highest in SA100 group, whereas SA50/MJ25 had the strongest effect on reducing MDA content. In the SA100 group, enzymatic activities of SOD and CA were enhanced significantly, while enzymatic activity of NR in MJ50 group was improved. After treated with SA100, expressions of HSP70, Mn SOD, CA and NR genes were improved by 2.04, 4.65, 2.15, and 1.58 times of the control. In addition, expressions of Mn SOD, CA and NR genes in MJ50 group decreased by 0.47, 0.50, and 0.46 time of the control. In SA50/MJ25 group, expression of HSP70 gene was enhanced but those of CA and NR genes were depressed. Therefore, SA and MJ could alleviate heat stress on G. lemaneiformis strongest in SA100 group and smallest in MJ50 group.
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