Potential role of salicylic acid in modulating diacylglycerol homeostasis in response to freezing temperatures in Arabidopsis.
In our recent article in Molecular Plant, we reported that 3 lipase-like defense regulators SENESCENCE-ASSOCIATED GENE101 (SAG101), ENHANCED DISEASE SUSCEPTIBILITY1 (EDS1) and PHYTOALEXIN DEFICIENT4 (PAD4) are involved in the regulation of freezing tolerance in Arabidopsis. The transcripts of SAG101, EDS1 and PAD4 were inducible by cold stress and their knockout or knockdown mutants exhibited enhanced chilling and freezing tolerance in comparison to the wild type. The freezing tolerance phenotype showed in the sag101, eds1 and pad4 mutants was correlated with the transcriptional upregulation of C-REPEAT/DRE BINDING FACTORs (CBFs) and their regulons as well as increased levels of proline. Upon cold exposure, the sag101, eds1 and pad4 mutants showed ameliorated cell death and accumulation of hydrogen peroxide, which were highly induced by freezing stress in the wild-type leaves. Moreover, the contents of salicylic acid (SA) and diacylglycerol (DAG) were significantly decreased in the sag101, eds1 and pad4 mutants compared to the wild type. Taken together, our results suggest that the SAG101, EDS1 and PAD4 are negative regulators in the freezing response and function, at least in part, by modulating the homeostasis of SA and DAG in Arabidopsis.
a State Key Laboratory of Biocontrol; Guangdong Provincial Key Laboratory of Plant Resources; Collaborative Innovation Center of Genetics and Development; School of Life Sciences; Sun Yat-sen University ; Guangzhou , China.
Wei-Juan
WJ
Tan
a State Key Laboratory of Biocontrol; Guangdong Provincial Key Laboratory of Plant Resources; Collaborative Innovation Center of Genetics and Development; School of Life Sciences; Sun Yat-sen University ; Guangzhou , China.
Shi
S
Xiao
Qin-Fang
QF
Chen
D000222:Adaptation, Physiological / Q000187:drug effects; D017360:Arabidopsis / Q000187:drug effects / Q000235:genetics / Q000276:immunology* / Q000502:physiology*; D029681:Arabidopsis Proteins / Q000378:metabolism; D004075:Diglycerides / Q000378:metabolism*; D005615:Freezing; D017343:Genes, Plant; D006706:Homeostasis / Q000187:drug effects*; D008049:Lipase / Q000378:metabolism; D009154:Mutation / Q000235:genetics; D020156:Salicylic Acid / Q000494:pharmacology*; D015398:Signal Transduction / Q000187:drug effects
C011439:1,2-diacylglycerol; D029681:Arabidopsis Proteins; D004075:Diglycerides; D008049:Lipase; D020156:Salicylic Acid
cold acclimation; diacylglycerol; freezing tolerance; reactive oxygen species; salicylic acid