, Volume 53, Issue 2, pp 279–287 | Cite as

Ultraviolet-B radiation or heat cause changes in photosynthesis, antioxidant enzyme activities and pollen performance in olive tree

  • G. C. Koubouris
  • N. Kavroulakis
  • I. T. Metzidakis
  • M. D. Vasilakakis
  • A. SofoEmail author
Original Papers


The present study attempts to determine how some physiological and reproductive functions of olive tree (Olea europaea L., cv. Koroneiki) respond to enhanced UV-B radiation or heat. Enhanced UV-B radiation was applied to (1) three-year-old potted plants in an open nursery (corresponded to ca. 16% ozone depletion), and (2) in vitro cultured pollen samples (220 μmol m−2 s−1, PAR = 400−700 nm + UV-B at 7.5, 15.0, or 22.5 kJ m−2 d−1). Potted olive plants were also subjected to high temperature (38 ± 4°C) for 28 h to mimic heat levels regularly measured in olive growing areas. A significant effect of UV-B on photosynthetic rate was observed. However, enhanced UV-B radiation did affect neither chlorophyll nor carotenoid content, supporting previous reports on hardiness of the photosynthetic apparatus in olive. Increased superoxide dismutase activity was observed in UV-B-treated olive plants (+ 225%), whereas no effect was found in the plants under heat stress. Neither UV-B and nor heat did affect H2O2 accumulation in the plant tissues. However, the same treatments resulted in enhanced lipid peroxidation (+ 18% for UV-B and + 15% for heat), which is likely linked to other reactive oxygen species. The increased guaiacol peroxidase activity observed in both treatments (+ 32% for UV-B and + 49% for heat) is related to the defense against oxidative membrane damage. The observed reduction in pollen germination (20–39%) and tube length (11–44%) could have serious implications on olive yields, especially for low fruit-setting cultivars or in years and environments with additional unfavorable conditions. UV-B and heat effects described here support the hypothesis that plant response to a given stressor is affected by the overall context and that a holistic approach is necessary to determine plant strategies for climate change adaptation.

Aditional key words

abiotic stress climate change lipid peroxidation ozone pollen germination 



analysis of variance






intercellular CO2 concentration


dry mass


fresh mass


guaiacol peroxidase


stomatal conductance




net photosynthetic rate


reactive oxygen species


superoxide dismutase


thiobarbituric acid reactive substances


ultraviolet-B radiation


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Copyright information

© The Institute of Experimental Botany 2015

Authors and Affiliations

  • G. C. Koubouris
    • 1
    • 2
  • N. Kavroulakis
    • 1
  • I. T. Metzidakis
    • 1
  • M. D. Vasilakakis
    • 2
  • A. Sofo
    • 3
    Email author
  1. 1.Institute for Olive Tree and Subtropical Plants, National Agricultural Research Foundation (N.AG.RE.F.)ELGO ‘DEMETER’ AgrokipioChaniaGreece
  2. 2.School of AgricultureAristotle University of ThessalonikiThessalonikiGreece
  3. 3.School of Agricultural, Forestry, Food and Environmental SciencesUniversità degli Studi della BasilicataPotenzaItaly

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