AUTHOR=Tang Danfeng , Quan Changqian , Lin Yang , Wei Kunhua , Qin Shuangshuang , Liang Ying , Wei Fan , Miao Jianhua 

TITLE=Physio-Morphological, Biochemical and Transcriptomic Analyses Provide Insights Into Drought Stress Responses in Mesona chinensis Benth

JOURNAL=Frontiers in Plant Science

VOLUME=13

YEAR=2022

URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2022.809723

DOI=10.3389/fpls.2022.809723

ISSN=1664-462X

ABSTRACT=<p>Drought stress affects the normal growth and development of <italic>Mesona chinensis</italic> Benth (MCB), which is an important medicinal and edible plant in China. To investigate the physiological and molecular mechanisms of drought resistance in MCB, different concentrations of polyethylene glycol 6000 (PEG6000) (0, 5, 10, and 15%) were used to simulate drought conditions in this study. Results showed that the growth of MCB was significantly limited under drought stress conditions. Drought stress induced the increases in the contents of Chla, Chlb, Chla + b, soluble protein, soluble sugar, and soluble pectin and the activities of superoxide dismutase (SOD), catalase (CAT), total antioxidant capacity (TAC), hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>), and malondialdehyde (MDA). Transcriptome analysis revealed 3,494 differentially expressed genes (DEGs) (1,961 up-regulated and 1,533 down-regulated) between the control and 15% PEG6000 treatments. These DEGs were identified to be involved in the 10 metabolic pathways, including “plant hormone signal transduction,” “brassinosteroid biosynthesis,” “plant–pathogen interaction,” “MAPK signaling pathway-plant,” “starch and sucrose metabolism,” “pentose and glucuronate interconversions,” “phenylpropanoid biosynthesis,” “galactose metabolism,” “monoterpenoid biosynthesis,” and “ribosome.” In addition, transcription factors (TFs) analysis showed 8 out of 204 TFs, <italic>TRINITY_DN3232_c0_g1</italic> [<italic>ABA-responsive element</italic> (<italic>ABRE</italic>)<italic>-binding transcription factor1, AREB1</italic>], <italic>TRINITY_DN4161_c0_g1</italic> (<italic>auxin response factor, ARF</italic>), <italic>TRINITY_DN3183_c0_g2</italic> (<italic>abscisic acid-insensitive 5-like protein, ABI5</italic>), <italic>TRINITY_DN28414_c0_g2</italic> (<italic>ethylene-responsive transcription factor ERF1b, ERF1b</italic>), <italic>TRINITY_DN9557_c0_g1</italic> (<italic>phytochrome-interacting factor, PIF3</italic>), <italic>TRINITY_DN11435_c1_g1, TRINITY_DN2608_c0_g1</italic>, and <italic>TRINITY_DN6742_c0_g1</italic>, were closely related to the “plant hormone signal transduction” pathway. Taken together, it was inferred that these pathways and TFs might play important roles in response to drought stress in MCB. The current study provided important information for MCB drought resistance breeding in the future.</p>