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J Exp Bot

Title:		Arabidopsis alkaline ceramidase ACER functions in defense against insect herbivory
Author(s):		Huang LQ; Li PP; Yin J; Li YK; Chen DK; Bao HN; Fan RY; Liu HZ; Yao N;
Address:		"State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, Guangzhou, P. R. China"
Journal Title:		J Exp Bot
Year:		2022
Volume:		73
Issue:		14
Page Number:		4954 - 4967
DOI:		10.1093/jxb/erac166
ISSN/ISBN:		1460-2431 (Electronic) 0022-0957 (Linking)
Abstract:		"Plant sphingolipids are important membrane components and bioactive molecules in development and defense responses. However, the function of sphingolipids in plant defense, especially against herbivores, is not fully understood. Here, we report that Spodoptera exigua feeding affects sphingolipid metabolism in Arabidopsis, resulting in increased levels of sphingoid long-chain bases, ceramides, and hydroxyceramides. Insect-induced ceramide and hydroxyceramide accumulation is dependent on the jasmonate signaling pathway. Loss of the Arabidopsis alkaline ceramidase ACER increases ceramides and decreases long-chain base levels in plants; in this work, we found that loss of ACER enhances plant resistance to S. exigua and improves response to mechanical wounding. Moreover, acer-1 mutants exhibited more severe root-growth inhibition and higher anthocyanin accumulation than wild-type plants in response to methyl jasmonate treatment, indicating that loss of ACER increases sensitivity to jasmonate and that ACER functions in jasmonate-mediated root growth and secondary metabolism. Transcript levels of ACER were also negatively regulated by jasmonates, and this process involves the transcription factor MYC2. Thus, our findings reveal that ACER is involved in mediating jasmonate-related plant growth and defense and that jasmonates function in regulating the expression of ACER"
Keywords:		"*Acer Alkaline Ceramidase/genetics/metabolism Animals *Arabidopsis/metabolism *Arabidopsis Proteins/genetics/metabolism Ceramides/metabolism Cyclopentanes/metabolism Gene Expression Regulation, Plant Herbivory Insecta Oxylipins/metabolism Sphingolipids/me;"
Notes:		"MedlineHuang, Li-Qun Li, Ping-Ping Yin, Jian Li, Yong-Kang Chen, Ding-Kang Bao, He-Nan Fan, Rui-Yuan Liu, Hao-Zhuo Yao, Nan eng 32070196/National Natural Science Foundation of China/ 2019B1515120088/Natural Science Foundation of Guangdong Province/ Research Support, Non-U.S. Gov't England 2022/04/19 J Exp Bot. 2022 Aug 11; 73(14):4954-4967. doi: 10.1093/jxb/erac166"