Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 423, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.127159
Keywords
Al stress; Melatonin; C; N assimilation; Oxidative stress; Transcriptome
Categories
Funding
- National Millet and Sorghum In-dustry Technical System Project [CARS-06-13.5-A28]
- National Key Technology R&D Program of China [2015BAD23B04-2]
- Shanxi Agricultural Valley Construction Scientific Research Program [SXNGJSKYZX201704]
- Key Research and Development General Project in Shanxi Province [201603D221003-2]
- National Natural Science Foundation of China [31101113]
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In this study, it was found that melatonin treatment reduced aluminum concentration in maize roots and leaves under aluminum stress, alleviating the growth inhibition induced by aluminum. Analysis of RNA-Seq, enzyme activity, and metabolite content data showed that melatonin treatment promoted carbon and nitrogen metabolism in maize seedlings, leading to a more stable metabolic level. Additionally, melatonin treatment improved photosynthetic rate, sucrose content, nitrate reductase activity, and protein content in maize seedlings under aluminum stress.
Melatonin, a regulatory molecule, performs pleiotropic functions in plants, including aluminum (Al) stress mitigation. Here, we conducted transcriptomic and physiological analyses to identify metabolic processes associated with the alleviated Al-induced growth inhibition of the melatonin-treated (MT) maize (Zea mays L.) seedlings. Melatonin decreased Al concentration in maize roots and leaves under Al stress. Al stress reduced the total dry weight (DW) by 41.2% after 7 days of treatment. By contrast, the total DW was decreased by only 19.4% in MT plants. According to RNA-Seq, enzyme activity, and metabolite content data, MT plants exhibited a higher level of relatively stable carbon and nitrogen metabolism than non-treated (NT) plants. Under Al stress, MT plants showed higher photosynthetic rate and sucrose content by 29.9% and 20.5% than NT plants, respectively. Similarly, the nitrate reductase activity and protein content of MT plants were 34.0% and 15.0% higher than those of NT plants, respectively. Furthermore, exogenous supply of melatonin mitigated Al-induced oxidative stress. Overall, our results suggest that melatonin alleviates aluminum-induced growth inhibition through modulating carbon and nitrogen metabolism, and reestablishing redox homeostasis in maize. Graphical Abstarct
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