期刊
PLANT PHYSIOLOGY AND BIOCHEMISTRY
卷 167, 期 -, 页码 958-969出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2021.09.007
关键词
Melatonin; Drought stress; C/N assimilation; Transcriptome
资金
- National Millet and Sorghum Industry Technical System Project [CARS-06-13.5-A28]
- Shanxi Agricultural Valley Construction Scientific Research Program [SXNGJSKYZX201704]
- Key Research and Development General Project in Shanxi Province [201603D221003-2]
- Shanxi Agricultural University Top Young Innovative Talents Program [TYIT201406]
Melatonin treatment enhances drought stress tolerance in maize seedlings by regulating carbon and nitrogen metabolism, resulting in higher photosynthesis, sucrose biosynthesis, nitrogen assimilation, and protein biosynthesis capacities under water deficit conditions.
Melatonin is a pleiotropic regulatory molecule in plants and is involved in regulating plant tolerance to drought stress. Here, we conducted transcriptomic and physiological analyses to identify metabolic processes associated with the enhanced tolerance of the melatonin-treated maize (Zea mays L.) seedlings to water deficit. Maize seedlings were foliar sprayed with either 50 mu M melatonin or water and exposed to drought stress for 12 d in growth chambers. Drought stress significantly suppressed seedling growth, and melatonin application partially alleviated this growth inhibition. RNA-Seq analysis revealed that genes whose expression was significantly altered by melatonin were mainly related to carbon (C) and nitrogen (N) metabolism. Analysis of transcriptomics, enzyme activity, and metabolite content data, melatonin-treated plants exhibited a higher level of relatively stable C and N metabolism than untreated plants; this phenotype of melatonin-treated plants was associated with their higher photosynthesis, sucrose biosynthesis, N assimilation, and protein biosynthesis capacities under drought stress. Overall, our results suggest that melatonin enhances drought stress tolerance in maize through coordinated regulation of C and N metabolism.
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