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How do Mediterranean shrub species cope with shade? Ecophysiological response to different light intensities

Title data

Díaz-Barradas, Mari Cruz ; Zunzunegui, María ; Álvarez-Cansino, Leonor ; Esquivias, Mari Paz ; Valera, J. ; Rodríguez, H.:
How do Mediterranean shrub species cope with shade? Ecophysiological response to different light intensities.
In: Plant Biology. Vol. 20 (March 2018) Issue 2 . - pp. 296-306.
ISSN 1438-8677
DOI: https://doi.org/10.1111/plb.12661

Abstract in another language

Under natural conditions, light exposure for Mediterranean shrubs can be highly variable, especially during cloudy days or under a canopy, and can interfere with other environmental factors such as temperature and water availability.With the aim of decoupling the effect of radiation and temperature from water availability, we conducted an experiment where two perennial and three summer semi‐deciduous shrub species were subjected to different levels of irradiation. In order to follow plant responses to light exposure, we measured gas exchange, photosystem II photochemical efficiency, photosynthetic pigments and leaf mass area in spring and summer.Results showed that all study species presented a plastic response to different light conditions, and that light‐related traits varied in a coordinated manner. Summer semi‐deciduous species exhibited a more opportunistic response, with higher photosynthesis rates in full sun, but under shade conditions, the two strategies presented similar assimilation rates. Stomatal conductance did not show such a drastic response as photosynthetsis, being related to changes in WUE. Daily cycles of Fv/Fm revealed a slight photoinhibitory response during summer, mainly in perennial species. In all cases photosynthetic pigments adjusted to the radiation level; leaves had lower chlorophyll content, higher pool of xanthophylls and higher proportion of the de‐epoxydaded state of xanthophylls under sun conditions. Lutein content increased in relation to the xanthophyll pool under shade conditions.Our results evidenced that radiation is an important driving factor controlling morphological and physiological status of Mediterranean shrub species, independently of water availability. Summer semi‐deciduous species exhibit a set of traits with higher response variability, maximising their photosynthetic assimilation under different sun conditions.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER151787
Institutions of the University: Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Professor Plant Ecology
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 03 Feb 2020 14:15
Last Modified: 03 Feb 2020 14:15
URI: https://eref.uni-bayreuth.de/id/eprint/53923