DIACYLGLYCEROL ACYLTRANSFERASE and DIACYLGLYCEROL KINASE Modulate Triacylglycerol and Phosphatidic Acid Production in the Plant Response to Freezing Stress

Plant Physiology
Wei-Juan TanShi Xiao

Abstract

Plants accumulate the lipids phosphatidic acid (PA), diacylglycerol (DAG), and triacylglycerol (TAG) during cold stress, but how plants balance the levels of these lipids to mediate cold responses remains unknown. The enzymes ACYL-COENZYME A:DIACYLGLYCEROL ACYLTRANSFERASE (DGAT) and DIACYLGLYCEROL KINASE (DGK) catalyze the conversion of DAG to TAG and PA, respectively. Here, we show that DGAT1, DGK2, DGK3, and DGK5 contribute to the response to cold in Arabidopsis (Arabidopsis thaliana). With or without cold acclimation, the dgat1 mutants exhibited higher sensitivity upon freezing exposure compared with the wild type. Under cold conditions, the dgat1 mutants showed reduced expression of C-REPEAT/DRE BINDING FACTOR2 and its regulons, which are essential for the acquisition of cold tolerance. Lipid profiling revealed that freezing significantly increased the levels of PA and DAG while decreasing TAG in the rosettes of dgat1 mutant plants. During freezing stress, the accumulation of PA in dgat1 plants stimulated NADPH oxidase activity and enhanced RbohD-dependent hydrogen peroxide production compared with the wild type. Moreover, the cold-inducible transcripts of DGK2, DGK3, and DGK5 were significantly more up-regulated in the dga...Continue Reading

Citations

Oct 19, 2019·Plant & Cell Physiology·Valentin AmbroiseKjell Sergeant
Nov 2, 2019·International Journal of Molecular Sciences·Lisa FürtauerThomas Nägele
Oct 28, 2019·MicrobiologyOpen·Nawaporn VinayavekhinWarinthorn Chavasiri
May 8, 2019·International Journal of Molecular Sciences·Songnan YangJunyi Gai
Apr 12, 2020·Plants·Junhao LuGuanqun Chen
Jun 24, 2020·The Plant Journal : for Cell and Molecular Biology·Yongtai YinMaoteng Li
Nov 10, 2020·Plant Signaling & Behavior·Yang BaiQun Zhang
Nov 10, 2020·Plant & Cell Physiology·Juan de Dios Barajas-LopezHiroaki Fujii
Nov 15, 2020·Progress in Lipid Research·Li-Juan XieShi Xiao
Aug 24, 2019·Progress in Lipid Research·Yasuhiro Higashi, Kazuki Saito
Jan 26, 2021·Plant Science : an International Journal of Experimental Plant Biology·Tixu HuXiangqiang Zhan
Mar 2, 2019·Progress in Lipid Research·Thomas VanherckeSurinder P Singh
Feb 7, 2021·The Plant Journal : for Cell and Molecular Biology·Yuan LinJiming Jiang
May 4, 2021·Frontiers in Plant Science·Xunchao ZhaoJingyu Xu
Apr 15, 2021·The Plant Journal : for Cell and Molecular Biology·Linhui YuChangcheng Xu
Dec 22, 2021·The New Phytologist·Patricia ScholzTill Ischebeck

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