Physiological and transcriptional regulation mechanisms of nitrogen alleviating drought stress in peanut
Year: 2023
Type: article
Abstract: Nitrogen application has an important effect on plant growth and development under drought stress. The aim of this study is to clarify the physiological and transcriptional regulation mechanism of nitrogen for improving drought resistance in peanut. The physiological indexes and root transcriptome of peanut under nitrogen application, drought stress and drought and nitrogen application simultaneously exist treatments were determined. The results showed that the drought and nitrogen application simultaneously exist treatment increased peanut biomass and the relative water content of leaves under drought stress. The content of total phenols and flavonoids in peanut roots were increased by nitrogen application under drought stress. Meanwhile, the activities of POD and CAT were increased, the content of MDA was decreased, which improved the drought resistance of peanut. Transcriptome analysis showed that the relative expression of 5396 genes changed due to nitrogen application. These genes were mainly involved in glutathione metabolism, nitrogen metabolism, and carbon metabolism, as well as stress and defense responses. Under drought stress, the drought and nitrogen application simultaneously exist treatments, the differentially expressed genes of secondary metabolite biosynthesis, transportation and catabolism and carbohydrate transport and metabolism were enriched. Among the three pathways related to phenolic metabolites, 51 differential genes were up-regulated and 207 genes were down-regulated under the drought and nitrogen application simultaneously exist treatment. In conclusion, the application of nitrogen fertilizer could enhance the antioxidant capacity of peanut plants under drought stress through regulating secondary metabolites and carbohydrate metabolism, and thus improve the drought resistance of peanut.
Source: ACTA AGRONOMICA SINICA
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: gold
Estimated APC paid: $941
OpenAlex ID: W7119488061