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EuSHT Acts as a Hub Gene Involved in the Biosynthesis of 6-Hydroxyluteolin and Quercetin Induced by Salt Stress in Eucommia ulmoides

Fuxin Li, Enyan Chen, Xinxin Chen, Jingyu Jia, Hemin Wang, Jie Zhang, Jian-Rui Sun, Xin Li

Phyton, 2024

Abstract

Salt stress inhibits plant growth and affects the biosynthesis of its secondary metabolites. Flavonoids are natural compounds that possess many important biological activities, playing a signi fi cant role in the medicinal activity of Eucommia ulmoides ( E. ulmoides ). To investigate the mechanism by which salt stress affects the biosynthesis of fl avonoids in E. ulmoides , a comprehensive analysis of metabolomics and transcriptomics was conducted. The results indicated that salt stress led to the wilting and darkening of E. ulmoides leaves, accompanied by a decrease in chlorophyll levels, and signi fi cantly induced malondialdehyde (MDA) and relative electrical conductivity. During salt stress, most metabolites in the fl avonoid biosynthesis pathway of E. ulmoides were upregulated, indicating that fl avonoid biosynthesis is likely the main induced pathway under salt stress. Among them, secondary metabolites such as 6-Hydroxyluteolin and Quercetin are likely key metabolites induced by salt stress. The correlation analysis of transcriptomics and metabolomics revealed that EuSHT is a hub gene induced by salt stress, promoting the production of fl avonoids such as 6-Hydroxyluteolin. The co-expression network showed a strong positive correlation between EuSHT and the biosynthesis of 6-Hydroxyluteolin and Quercetin, while it exhibited a negative correlation with Catechin biosynthesis. The branches leading to Luteolin and Dihydroquercetin are likely the main pathways for fl avonoid…

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