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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Plant Sci. | doi: 10.3389/fpls.2019.01086

Involvement of phosphatidylserine and triacylglycerol in the response of sweet potato leaves to salt stress

Yicheng Yu1, Meng Kou2, Zhonghui Gao1, Yang Liu1, Ying Xuan1,  Zhonghou Tang2,  Qinghe CAO2,  Zongyun Li1 and  Jian Sun1*
  • 1School of Life Science, Jiangsu Normal University, China
  • 2Key Laboratory for Biology and Genetic Breeding of Sweet Potato, Sweet Potato Research Institute (CAAS), China

Lipid remodeling plays an important role in the adaptation of plants to environmental factors, but the mechanism by which lipid remodeling mediates salt stress response remains unclear. In this study, we compared the leaf lipidome of two different sweet potato cultivars upon salinity stress. Salt treatment led to obvious remodeling of the leaf lipidome in both cultivars. Compared with Xu 32 (salt sensitive) leaves, Xu 22 (salt tolerant) leaves generally maintained higher abundance of phospholipids, glycolipids, sphingolipids, sterol derivatives and diacylglycerol under salinity condition. Interestingly, salinity stress significantly increased phosphatidylserine (PS) abundance in Xu 22 leaves by predominantly triggering the increase of PS (20:5/22:6). Furthermore, Xu 32 leaves accumulated higher triacylglycerol (TG) level than Xu 22 leaves under salinity condition. Exogenous application of PS delayed the salt-induced leaf senescence in Xu 32 via reduction of salt-induced K+ efflux and upregulation of plasma membrane (PM) H+-ATPase activity. However, inhibition of TG mobilization in salinized-Xu 22 leaves disturbed the energy and K+/Na+ homeostasis as well as PM H+-ATPase activity. These results demonstrate the alterations in the leaf lipidome of sweet potato under salinity condition, underscoring the importance of PS and TG in mediating salt defensive responses in sweet potato leaves.

Keywords: salt stress, Sweet potato, lipidomics, phosphatidylserine, triacylglycerol, K+/Na+ homeostasis, PM H+-ATPase

Received: 15 Apr 2019; Accepted: 09 Aug 2019.

Edited by:

Camilla Hill, Murdoch University, Australia

Reviewed by:

Todd R. Graham, Vanderbilt University, United States
Ashutosh Singh, University of Lucknow, India
Chiara Cirillo, University of Naples Federico II, Italy  

Copyright: © 2019 Yu, Kou, Gao, Liu, Xuan, Tang, CAO, Li and Sun. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Jian Sun, School of Life Science, Jiangsu Normal University, Xuzhou, 221116, Jiangsu Province, China, sunjian@jsnu.edu.cn