Abstract
Metabolic responses are important for plant adaptation to abiotic stress. To investigate the responses of Phlox subulata L. to drought stress, we analyzed its physiological and metabolic changes using gas chromatography-mass spectrometer. Based on the physiological indices, P. subulata L. has tolerance to drought to some degree. Our results showed that there were a total of 30 key metabolites induced by drought stress, including amino acids, organic acids, sugars and sugar alcohols, nucleic acid and its derivatives, and other organic compounds. The glutamic acid-mediated proline biosynthesis pathway is continuously upregulated under drought stress, which could regulate osmotic pressure and maintain intracellular environmental stability. More secondary metabolites are used to increase glycolysis and tricarboxylic acid cycle, to accelerate energy production and to enhance the glutamic acid-mediated proline biosynthesis pathway, which are necessary to increase osmotic regulation. Prolonged drought stress induced progressive accumulation of compatible osmolytes, such as proline and inositol, sugars, and amino acids. Therefore, drought caused systemic alterations in metabolic networks involving transamination, TCA cycle, gluconeogenesis/glycolysis, glutamate-mediated proline biosynthesis, shikimate-mediated secondary metabolisms, and the metabolism of pyrimidine. These data suggest that plants may utilize these physiological and metabolomic adjustments as adaptive responses in the early stages of drought stress. These results deepen our understanding of the mechanisms involved in P. subulata L. drought tolerance, which will help improve the understanding of drought’s effects on plant systems.
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Funding
This research was funded by grants from the National Key Research and Development Program of China (No. 2016YFC0500300), special project of basic applied technology research by institutions in Heilongjiang Province (ZNB2020ZR07).
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These results deepen our understanding of the mechanisms involved in P. subulata L. drought tolerance, which will help improve the understanding of drought’s effects on plant systems.
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Fig. S1
The morphology (left) and flowers (right) of Phlox subulata L. (PNG 28758 kb)
Fig. S2
The nitro blue tetrazolium (NBT) and diamino benzidine (DAB) staining results of Phlox subulata roots under drought stress A-D: NBT staining to test H2O2; (A) drought stress for 4 days; (B) drought stress for 8 days; (C) drought stress for 12 days; (D) 4 days after rehydration, E-H: DAB staining to test O2−; (E) drought stress for 4 days; (F) drought stress for 8 days; (G) drought stress for 12 days; (H) 4 days after rehydration. DAS: day after drought stress (PNG 3490 kb)
Fig. S3
Changes in GSH/GSSG (A), GSH+GSSG (B), ASA/DHA (C), ASA+DHA (D) of Phlox subulata roots under drought stress. Values represent the means of six separate experiments ± standard deviations (SD). Lowercase letters stand for significant difference at 5% level (PNG 254 kb)
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Xiong, Y., Qu, Y., Han, H. et al. Unraveling Physiological and Metabolomic Responses Involved in Phlox subulata L. Tolerance to Drought Stress. Plant Mol Biol Rep 39, 98–111 (2021). https://doi.org/10.1007/s11105-020-01238-7
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DOI: https://doi.org/10.1007/s11105-020-01238-7