Regulation of tocopherol (vitamin E) biosynthesis by abscisic acid-dependent and -independent pathways during abiotic stress in Arabidopsis.

ABSTRACT:

Main conclusion

The increase in tocopherol (vitamin E) biosynthesis in Arabidopsis during drought and osmotic stress, but not during high light or nitrogen deprivation, is mediated by abscisic acid. Plants increase the production of antioxidants including tocochromanols (vitamin E) during stress. To study the regulation of tocochromanol synthesis, Arabidopsis plants were exposed to drought, osmotic stress stimulated by polyethylene glycol, abscisic acid (ABA), nitrogen deprivation, and high light. ABA treatment resulted in increased contents of tocochromanols, and expression of the key tocopherol biosynthesis genes VTE2 and HPPD was upregulated, indicating that tocochromanol accumulation was regulated by ABA. Under drought and osmotic stress, the ABA and tocochromanol contents as w

SUBMITTER: Kreszies V 

PROVIDER: S-EPMC11926002 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature