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Main conclusion <p>The increase in tocopherol (vitamin E) biosynthesis in <i>Arabidopsis</i> during drought and osmotic stress, but not during high light or nitrogen deprivation, is mediated by abscisic acid.</p> Abstract <p>Plants increase the production of antioxidants including tocochromanols (vitamin E) during stress. To study the regulation of tocochromanol synthesis, <i>Arabidopsis</i> 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 <i>VTE2</i> and <i>HPPD</i> was upregulated, indicating that tocochromanol accumulation was regulated by ABA. Under drought and osmotic stress, the ABA and tocochromanol contents as well as <i>VTE2</i> and <i>HPPD</i> expression were also increased. ABA levels did not change during nitrogen deprivation or high light treatment, indicating that tocochromanol accumulation under these conditions was ABA-independent. Tocochromanol accumulation during drought or osmotic stress was not compromised in the ABA-deficient <i>aba1-6</i>, <i>aba2-1</i> and <i>aba3-2</i> mutants, suggesting that tocochromanol synthesis under these conditions was mostly regulated in an ABA-independent way. Therefore, the accumulation of tocochromanols in <i>Arabidopsis</i> can be regulated by ABA-dependent and ABA-independent signaling pathways, based on the specific conditions.</p>

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

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月20日

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  • Victoria Kreszies,
  • Nina Hoppe,
  • Katharina Gutbrod,
  • Peter Dörmann

摘要

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.

Abstract

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 well as VTE2 and HPPD expression were also increased. ABA levels did not change during nitrogen deprivation or high light treatment, indicating that tocochromanol accumulation under these conditions was ABA-independent. Tocochromanol accumulation during drought or osmotic stress was not compromised in the ABA-deficient aba1-6, aba2-1 and aba3-2 mutants, suggesting that tocochromanol synthesis under these conditions was mostly regulated in an ABA-independent way. Therefore, the accumulation of tocochromanols in Arabidopsis can be regulated by ABA-dependent and ABA-independent signaling pathways, based on the specific conditions.