Integrated Metabolomic and Transcriptomic Analysis of the Quinoa Seedling Response to High Relative Humidity Stress

• Published in: Biomolecules (Basel, Switzerland) Vol. 13; no. 9; p. 1352
• Main Authors: Li, Xinyi, Zhang, Ping, Liu, Jia, Wang, Hongxin, Liu, Junna, Li, Hanxue, Xie, Heng, Wang, Qianchao, Li, Li, Zhang, Shan, Huang, Liubin, Liu, Chenghong, Qin, Peng
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.09.2023; MDPI
• Subjects: Abiotic stress; Abscisic acid; Agricultural education; Chlorophyll; Chromatography; differentially expressed gene; Drought; Drought resistance; Environmental aspects; Flavonoids; Gene regulation; Genetic aspects; high relative humidity; Humidity; Leaves; Lipid metabolism; Mass spectrometry; metabolite accumulation; Metabolites; Metabolomics; Morphology; Physiological aspects; Physiology; Quinoa; Relative humidity; Research methodology; Scientific imaging; Seedlings; Seeds; Stress (Physiology); Transcription factors; Transcriptomes; Transcriptomics; China; United States > US
• ISSN: 2218-273X; 2218-273X
• DOI: 10.3390/biom13091352

Quinoa is of great interest because it is cold- and drought-resistant; however, little research has been performed on quinoa under high relative humidity (RH) stress. In this study, quinoa seedlings of a highly HR-resistant variety (“Dianli-439”) and a sensitive variety (“Dianli-969”) were subjected to morphological and physiological measurements and metabolome and transcriptome analyses to investigate their response to high RH stress. In total, 1060 metabolites were detected, and lipids and flavonoids were the most abundant, with 173 and 167 metabolites, respectively. In total, 13,095 differentially expressed genes were identified, and the results showed that abscisic acid, auxin, and jasmonic-acid-related genes involved in plant hormone signaling may be involved in the response of quinoa seedlings to high RH stress. The analysis of the transcription factors revealed that the AP2/ERF family may also play an important role in the response to high RH stress. We identified the possible regulatory mechanisms of the hormone signaling pathways under high RH stress. Our findings can provide a basis for the selection and identification of highly resistant quinoa varieties and the screening of the metabolite-synthesis- and gene-regulation-related mechanisms in quinoa in response to RH stress.