期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 23, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/ijms23094911
关键词
antioxidant enzyme; Na+/H+ antiport; Populus euphratica; phospholipase D delta; phosphatidic acid; PM H+-ATPase; ROS; salt stress
资金
- National Natural Science Foundation of China [32071730, 31770643]
- Program of Introducing Talents of Discipline to Universities, China (111 Project) [B13007]
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Municipal Education Commission (China)
Phospholipase D delta (PLD delta) plays a crucial role in salt adaptation of higher plants. Transgenic Arabidopsis plants overexpressing PePLD delta showed improved salt tolerance, characterized by reduced electrolyte leakage, malondialdehyde content, and H2O2 levels. The enhanced salt tolerance was attributed to the activation of antioxidant enzymes and upregulation of genes encoding Na+/H+ antiporter and H+-ATPase. Furthermore, the abundance of specific phosphatidic acid (PA) species in PePLD delta-transgenic plants was associated with the regulation of reactive oxygen species (ROS) and K+/Na+ homeostasis. Specifically, PA species 34:2 (16:0-18:2), 34:3 (16:0-18:3), 36:4 (18:2-18:2), and 36:5 (18:2-18:3) significantly increased in response to salt treatment.
Phospholipase D alpha (PLD alpha), which produces signaling molecules phosphatidic acid (PA), has been shown to play a critical role in plants adapting to salt environments. However, it is unclear whether phospholipase D delta (PLD delta) can mediate the salt response in higher plants. PePLD delta was isolated from salt-resistant Populus euphratica and transferred to Arabidopsis thaliana to testify the salt tolerance of transgenic plants. The NaCl treatment (130 mM) reduced the root growth and wholeplant fresh weight of wild-type (WT) A. thaliana, vector controls (VC) and PePLD delta-overexpressed lines, although a less pronounced effect was observed in transgenic plants. Under salt treatment, PePLD delta-transgenic Arabidopsis exhibited lower electrolyte leakage, malondialdehyde content and H2O2 levels than WT and VC, resulting from the activated antioxidant enzymes and upregulated transcripts of genes encoding superoxide dismutase, ascorbic acid peroxidase and peroxidase. In addition, PePLD delta-overexpressed plants increased the transcription of genes encoding the plasma membrane Na+/H+ antiporter (AtSOS1) and H+-ATPase (AtAHA2), which enabled transgenic plants to proceed with Na+ extrusion and reduce K+ loss under salinity. The capacity to regulate reactive oxygen species (ROS) and K+/Na+ homeostasis was associated with the abundance of specific PA species in plants overexpressing PePLD delta. PePLD delta-transgenic plants retained a typically higher abundance of PA species, 34:2 (16:0-18:2), 34:3 (16:0-18:3), 36:4 (18:2-18:2), 36:5 (18:2-18:3) and 36:6 (18:3-18:3), under control and saline conditions. It is noteworthy that PA species 34:2 (16:0-18:2), 34:3 (16:0-18:3), 36:4 (18:2-18:2) and 36:5 (18:2-18:3) markedly increased in response to NaCl in transgenic plants. In conclusion, we suppose that PePLD delta-derived PA enhanced the salinity tolerance by regulating ROS and K+/Na+ homeostasis in Arabidopsis.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据