biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 50:373-382, 2006 | DOI: 10.1007/s10535-006-0052-y

Contrasting foliar responses to drought in Quercus ilex and Phillyrea latifolia

R. Ogaya1,*, J. Penuelas1
1 Unitat d'Ecofisiologia CSIC-CEAB-CREAF, Universitat Autonoma de Barcelona, Bellaterra, Barcelona, Spain

Leaf morphology, longevity, and demography were examined in Quercus ilex and Phillyrea latifolia growing in a holm oak forest in Prades mountains (northeast Spain). Four plots (10 × 15 m) of this forest were submitted to an experimental drought during three years (soil moisture was reduced about 15 %). Leaf area, thickness and leaf mass per area ratio (LMA) were measured in sun and shade leaves of both species. Leaf longevity, the mean number of current-year shoots produced per previous-year shoot (Sn/Sn-1), the mean number of current-year leaves per previous-year shoot (Ln/Sn-1), and the percentage of previous-year shoots that developed new ones were measured once a year, just after leaf flushing. LMA and leaf thickness increased since leaf unfolding except in summer periods, when stomatal closure imposed low photosynthetic rates and leaves consumed their reserves. LMA, leaf area, and leaf thickness were higher in Q. ilex than in P. latifolia, but leaf density was higher in the latter species. Drought reduced the leaf thickness and the LMA of both species ca. 2.5 %. Drought also increased leaf shedding up to ca. 20 % in Phillyrea latifolia and decreased it up to ca. 20 % in Q. ilex. In the later species, Sn/Sn-1 decreased by 32 %, Ln/Sn-1 by 41 %, percentage of shoots developed new ones by 26 %, and leaf area by 17 %. Thus the decrease of leaf number and area was stronger in the less drought-resistant Q. ilex, which, under increasingly drier conditions, might lose its current competitive advantage in these Mediterranean holm oak forests.

Keywords: climate change; leaf longevity; leaf mass per area ratio; Mediterranean forest
Subjects: drought stress; growth analysis, plant development, biomass and yield enhancement; leaf longevity; Phillyfilirea latifolia; Quercus ilex; sun-shade leaves

Received: October 4, 2004; Accepted: August 15, 2005; Published: September 1, 2006  Show citation

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Ogaya, R., & Penuelas, J. (2006). Contrasting foliar responses to drought in Quercus ilex and Phillyrea latifolia. Biologia plantarum, 50(3), 373-382. doi: 10.1007/s10535-006-0052-y
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