Salicylic acid-mediated diacylglycerol/triacylglycerol conversion affects the freezing tolerance of Arabidopsis
文献类型： 外文期刊
作者： Xu, Le 1 ; Wu, Jun 1 ; Zhao, Yancui 1 ; Liu, Huaqiong 1 ; Zhang, Wenying 1 ; Xu, Yanhao 3 ;
作者机构： 1.Yangtze Univ, Minist Educ, Hubei Collaborat Innovat Ctr Grain Ind, Engn Res Ctr Ecol & Agr Use Wetland, Jingzhou 434025, Peoples R China
2.Hubei Key Lab Food Crop Germplasm & Genet Improve, Wuhan, Peoples R China
3.Hubei Acad Agr Sci, 29 Nanhu Rd,Shizishan St, Wuhan 430064, Hubei, Peoples R China
关键词： Salicylic acid; Diacylglycerol; Triacylglycerol; Cold stress; Arabidopsis
期刊名称：PLANT GROWTH REGULATION （ 影响因子：3.242； 五年影响因子：3.607 ）
ISSN： 0167-6903
年卷期：
页码：
收录情况： SCI
摘要： Diacylglycerol (DAG) is likely converted to triacylglycerol (TAG) by the enzyme diacylglycerol acyltransferase (DGAT), and this conversion is important in the freezing tolerance of Arabidopsis. The phytohormone salicylic acid (SA) and DAG/TAG ratio are known to play important roles in the chilling and freezing tolerance of Arabidopsis while the interaction or connection was not clear. In our study, we analysed the chilling phenotype, proline and sugar accumulation, phytohormone content, and lipid profiling of dgat1 mutants during chilling or freezing stress. We found that dgat1-1 mutants exhibited higher sensitivity to long time cold stress and showed lower proline and sugar accumulation under cold acclimation conditions. The freezing-sensitive phenotype of dgat1 mutants can be ameliorated by mutations of key SA signalling components SAG101, EDS1, and PAD4 through phenotyping analysis of double mutants. Dgat1 mutants accumulated more SA, ABA (abscisic acid), JA-Ile (jasmonate isoleucine), and OPDA (12-oxyphytodienoic acid) during freezing stress and after recovery. In addition, the DAG/TAG content in the SA-deficient mutant sid2 was lower than that in the wild type, while the SA-excessive accumulated mutant siz1 showed the opposite trend. In summary, SA could negatively mediate the freezing tolerance of Arabidopsis by regulating the ratio of DAG and TAG, which influences the integrity of the membrane and it provide a novel research direction.
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