4.5 Article

Diurnal patterns of α-tocopherol accumulation in Mediterranean plants

Journal

JOURNAL OF ARID ENVIRONMENTS
Volume 74, Issue 11, Pages 1572-1576

Publisher

ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jaridenv.2010.05.003

Keywords

Antioxidants; Diurnal changes; Drought stress; Photo-oxidative stress; Photoprotection; Tocopherols (vitamin E)

Funding

  1. Ministry of Science and Innovation of the Spanish Government [BFU2006-01127, BFU2009-07294, BFU2009-06045, CSD2008-00040]
  2. Generalitat de Catalunya

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Diurnal variations in alpha-tocopherol were evaluated in combination with different indicators of stress in seven plant species grown under Mediterranean field conditions. The species studied were a gymnospern, Pinus pinea L., and six angiosperms, Quercus suber L. (Fagaceae), Cistus clusii Dunal and Cistus albidus L. (Cistaceae), Rosmarinus officinalis L, Salvia officinalis L. ssp. major and Melissa officinalis L. (Labiatae). Contrasting patterns of diurnal variations in alpha-tocopherol during the summer were observed in plants, mainly related to their degree of stress resistance. While both trees (P. pinea and Q. suber) and C. albidus displayed increases of a-tocopherol at midday, the contents of this antioxidant kept constant throughout the day in C. clusii and R. officinalis, and decreased significantly at midday in S. officinalis and M. officinalis. This midday depression of alpha-tocopherol may be indicative of the sensitivity of these latter species to high light during the summer drought characteristic of the Mediterranean climate. (C) 2010 Elsevier Ltd. All rights reserved.

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