干旱区生态环境知识资源中心(Arid): Melatonin increases growth and salt tolerance of Limonium bicolor by improving photosynthetic and antioxidant capacity

Arid

DOI	10.1186/s12870-021-03402-x
	Melatonin increases growth and salt tolerance of Limonium bicolor by improving photosynthetic and antioxidant capacity
	Li, Junpeng; Liu, Yun; Zhang, Mingjing; Xu, Hualing; Ning, Kai; Wang, Baoshan; Chen, Min
通讯作者	Wang, BS ; Chen, M (corresponding author)，Shandong Normal Univ, Coll Life Sci, Shandong Prov Key Lab Plant Stress Res, Jinan 250014, Shandong, Peoples R China.
来源期刊	BMC PLANT BIOLOGY
ISSN	1471-2229
出版年	2022
卷号	22 期号:1
英文摘要	Background Soil salinization is becoming an increasingly serious problem worldwide, resulting in cultivated land loss and desertification, as well as having a serious impact on agriculture and the economy. The indoleamine melatonin (N-acetyl-5-methoxytryptamine) has a wide array of biological roles in plants, including acting as an auxin analog and an antioxidant. Previous studies have shown that exogenous melatonin application alleviates the salt-induced growth inhibition in non-halophyte plants; however, to our knowledge, melatonin effects have not been examined on halophytes, and it is unclear whether melatonin provides similar protection to salt-exposed halophytic plants. Results We exposed the halophyte Limonium bicolor to salt stress (300 mM) and concomitantly treated the plants with 5 mu M melatonin to examine the effect of melatonin on salt tolerance. Exogenous melatonin treatment promoted the growth of L. bicolor under salt stress, as reflected by increasing its fresh weight and leaf area. This increased growth was caused by an increase in net photosynthetic rate and water use efficiency. Treatment of salt-stressed L. bicolor seedlings with 5 mu M melatonin also enhanced the activities of antioxidants (superoxide dismutase [SOD], peroxidase [POD], catalase [CAT], and ascorbate peroxidase [APX]), while significantly decreasing the contents of hydrogen peroxide (H2O2), superoxide anion (O-2(center dot-)), and malondialdehyde (MDA). To screen for L. bicolor genes involved in the above physiological processes, high-throughput RNA sequencing was conducted. A gene ontology enrichment analysis indicated that genes related to photosynthesis, reactive oxygen species scavenging, the auxin-dependent signaling pathway and mitogen-activated protein kinase (MAPK) were highly expressed under melatonin treatment. These data indicated that melatonin improved photosynthesis, decreased reactive oxygen species (ROS) and activated MAPK-mediated antioxidant responses, triggering a downstream MAPK cascade that upregulated the expression of antioxidant-related genes. Thus, melatonin improves the salt tolerance of L. bicolor by increasing photosynthesis and improving cellular redox homeostasis under salt stress. Conclusions Our results showed that melatonin can upregulate the expression of genes related to photosynthesis, reactive oxygen species scavenging and mitogen-activated protein kinase (MAPK) of L. bicolor under salt stress, which can improve photosynthesis and antioxidant enzyme activities. Thus melatonin can promote the growth of the species and maintain the homeostasis of reactive oxygen species to alleviate salt stress.
英文关键词	Antioxidant Gene expression Limonium bicolor Melatonin Salt tolerance
类型	Article
语种	英语
开放获取类型	gold, Green Published
收录类别	SCI-E
WOS记录号	WOS:000738597000002
WOS关键词	INDUCED STRESS TOLERANCE ; SUAEDA-SALSA ; SECRETION ; SALINITY ; TRANSCRIPTOME ; SEEDLINGS ; GLAND ; L. ; TRANSPORTER ; EXPRESSION
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/376628
作者单位	[Li, Junpeng; Liu, Yun; Zhang, Mingjing; Wang, Baoshan; Chen, Min] Shandong Normal Univ, Coll Life Sci, Shandong Prov Key Lab Plant Stress Res, Jinan 250014, Shandong, Peoples R China; [Xu, Hualing; Ning, Kai] DongYing Acad Agr Sci, Dongying 257000, Shandong, Peoples R China
推荐引用方式 GB/T 7714	Li, Junpeng,Liu, Yun,Zhang, Mingjing,et al. Melatonin increases growth and salt tolerance of Limonium bicolor by improving photosynthetic and antioxidant capacity[J],2022,22(1).
APA	Li, Junpeng.,Liu, Yun.,Zhang, Mingjing.,Xu, Hualing.,Ning, Kai.,...&Chen, Min.(2022).Melatonin increases growth and salt tolerance of Limonium bicolor by improving photosynthetic and antioxidant capacity.BMC PLANT BIOLOGY,22(1).
MLA	Li, Junpeng,et al."Melatonin increases growth and salt tolerance of Limonium bicolor by improving photosynthetic and antioxidant capacity".BMC PLANT BIOLOGY 22.1(2022).