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Forestry Advance Access published online on April 3, 2009
Forestry, doi:10.1093/forestry/cpp008
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© Institute of Chartered Foresters, 2009. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Deep shade alters the acclimation response to moderate water stress in Quercus suber L.

Maria Dolores Jiménez1 6,*, Marta Pardos2, Jaime Puértolas3, Leszek A. Kleczkowski4 and Jose Alberto Pardos5

1 U.D. Anatomía, Fisiología y Genética, ETSI Montes, UPM, 28040 Madrid, Spain
2 CIFOR-INIA, Ap. Correos 8.111, 28080 Madrid, Spain
3 Fundación CEAM, Universidad de Alicante, Departamento Ecología, Campus de Sant Vicent del Raspeig, Apdo. 99, E-03080 Alicante, Spain
4 Department of Plant Physiology, Umeå Plant Science Centre, Umeå University, 901 87 Umeå, Sweden
5 Current address: Departamento de Biología Vegetal I, Facultad de Biología, Universidad Complutense de Madrid, Jose Antonio Novais no 2, 28040 Madrid, Spain

* Corresponding author. E-mail: jimenezmd{at}bio.ucm.es


  Abstract

The interactive effects of shade and drought on different morphological and physiological traits were addressed on Quercus suber L. seedlings. In our experiment, limited light treatment (1 per cent) represented the main factor constraining cork oak seedlings growth. Maximal photochemical efficiency (Fv/Fm) with light ≥15 per cent exhibited a midday fall, but under deep shade (1 per cent), Fv/Fm remained constant (<0.8 values) throughout the day. The quantum efficiency of photosystem II (PSII) was lower under moderate drought only in deeply shaded plants. The drought also interacted with light through the increase of the soluble sugar content at 100 per cent light, but not under shade. Under deep shade, soluble sugar content tended to be even lower under moderate drought conditions. The chlorophyll content was not the highest under deep shade as could be expected, while the efficiency of PSII was the lowest under deep shade. We concluded that cork oak can acclimate to moderate shade (15 per cent light), but deep shade impairs some of the physiological responses to cope with low light conditions under moderate drought stress. Plants growing under deep shade were very sensitive to moderate water stress in terms of loss of carbon fixation capacity.

6 Present address: Departamento de Biología Vegetal I, Facultad de Biología, Universidad Complutense de Madrid, Jose Antonio Novais no 2, 28040 Madrid, Spain.

Received 2 January 2009.
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