Drought-induced oxidative stress in strawberry tree (Arbutus unedo L.) growing in Mediterranean field conditions

S. Munné-Bosch, J. Peñuelas

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    104 Citations (Scopus)

    Abstract

    To study the relationship between drought and oxidative stress and mechanisms of photo- and antioxidative protection in strawberry tree (Arbutus unedo L.), the endogenous concentrations of xanthophyll cycle pigments, α-tocopherol and reduced and oxidized ascorbate were measured in 2-year-old plants exposed to a combination of water deficit, high light and high temperatures in Mediterranean field conditions. Under moderate stress (relative leaf water content [RWC] of ca. 68%), levels of photosynthetic pigments (chlorophylls and carotenoids) and ascorbate were kept constant, while α-tocopherol levels increased by ca. 50%. Under severe stress (RWC of ca. 53%): (i) α-tocopherol levels remained high, (ii) zeaxanthin concentrations increased by 75%, (iii) ascorbate increased by 54% and its redox state shifted towards its oxidized form, and (iv) chlorophylls, lutein and β-carotene decreased by ca. 63, 61 and 75%, respectively. These results are consistent with the contentions that drought causes oxidative stress in A. unedo plants, and that mechanisms of photo- and antioxidative protection contribute to withstand drought-induced oxidative stress in this Mediterranean plant species. © 2004 Elsevier Ireland Ltd. All rights reserved.
    Original languageEnglish
    Pages (from-to)1105-1110
    JournalPlant Science
    Volume166
    Issue number4
    DOIs
    Publication statusPublished - 1 Apr 2004

    Keywords

    • α-Tocopherol
    • Activated oxygen species
    • Antioxidants
    • AOS
    • Ascorbate
    • Carotenoids
    • Chl
    • Chlorophyll a+b
    • De-epoxidation state of the xanthophyll cycle
    • DPS
    • Drought
    • Dry weight
    • DW
    • H
    • Hydration of leaves
    • Oxidative stress
    • Strawberry tree (Arbutus unedo L.)

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