The Arabidopsis ceramidase AtACER functions in disease resistance and salt tolerance |
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| Authors: | Jian‐Xin Wu Jian Li Zhe Liu Jian Yin Zhen‐Yi Chang Chan Rong Jia‐Li Wu Fang‐Cheng Bi Nan Yao |
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| Affiliation: | State Key Laboratory of Biocontrol, Guangdong Key Laboratory of Plant Resource, School of Life Sciences, Sun Yat‐sen University, Guangzhou, China |
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| Abstract: | Ceramidases hydrolyze ceramide into sphingosine and fatty acids. In mammals, ceramidases function as key regulators of sphingolipid homeostasis, but little is known about their roles in plants. Here we characterize the Arabidopsis ceramidase AtACER, a homolog of human alkaline ceramidases. The acer‐1 T‐DNA insertion mutant has pleiotropic phenotypes, including reduction of leaf size, dwarfing and an irregular wax layer, compared with wild‐type plants. Quantitative sphingolipid profiling showed that acer‐1 mutants and the artificial microRNA‐mediated silenced line amiR‐ACER‐1 have high ceramide levels and decreased long chain bases. AtACER localizes predominantly to the endoplasmic reticulum, and partially to the Golgi complex. Furthermore, we found that acer‐1 mutants and AtACER RNAi lines showed increased sensitivity to salt stress, and lines overexpressing AtACER showed increased tolerance to salt stress. Reduction of AtACER also increased plant susceptibility to Pseudomonas syringae. Our data highlight the key biological functions of ceramidases in biotic and abiotic stresses in plants. |
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| Keywords: | ceramidase ceramide sphingolipids
Arabidopsis thaliana
defense salt tolerance |
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