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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
RESEARCH ARTICLE

Light inhibition of foliar respiration in response to soil water availability and seasonal changes in temperature in Mediterranean holm oak (Quercus ilex) forest

Matthew H. Turnbull A K , Romà Ogaya B C , Adrià Barbeta B C J , Josep Peñuelas B C , Joana Zaragoza-Castells D , Owen K. Atkin E , Fernando Valladares F , Teresa E. Gimeno G J , Beatriz Pías H and Kevin L. Griffin I
+ Author Affiliations
- Author Affiliations

A Centre for Integrative Ecology, School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand.

B CREAF, Cerdanyola del Vallès, 08193, Catalonia, Spain.

C CSIC, Global Ecology Unit CREAF-CSIC-UAB, Cerdanyola del Vallès, 08193, Catalonia, Spain.

D Geography, College of Life and Environmental Sciences, University of Exeter, Amory Building, Rennes Drive, Exeter EX4 4RJ, UK.

E ARC Centre of Excellence in Plant Energy Biology, Division of Plant Sciences, Research School of Biology, Building 134, The Australian National University, Canberra, ACT 2601, Australia.

F Museo Nacional de Ciencias Naturales, CSIC, Serrano 115, E-28006 Madrid, Spain.

G Hawkesbury Institute for the Environment, University of Western Sydney, Locked bag 1797, Penrith, NSW 2751, Australia.

H Departamento de Botánica, Universidad Complutense de Madrid, José Antonio Novais 2, 28040, Madrid, Spain.

I Lamont-Doherty Earth Observatory of Columbia University, 61 Route 9W, 6 Biology, Palisades, NY 10964, USA.

J ISPA, Bordeaux Science Agro, INRA, 33140 Villenave d’Ornon, France.

K Corresponding author. Email: matthew.turnbull@canterbury.ac.nz

Functional Plant Biology 44(12) 1178-1193 https://doi.org/10.1071/FP17032
Submitted: 27 January 2017  Accepted: 23 July 2017   Published: 17 August 2017

Abstract

In the present study we investigated variations in leaf respiration in darkness (RD) and light (RL), and associated traits in response to season, and along a gradient of soil moisture, in Mediterranean woodland dominated by holm oak (Quercus ilex L.) in central and north-eastern Spain respectively. On seven occasions during the year in the central Spain site, and along the soil moisture gradient in north-eastern Spain, we measured rates of leaf RD, RL (using the Kok method), light-saturated photosynthesis (A) and related light response characteristics, leaf mass per unit area (MA) and leaf nitrogen (N) content. At the central Spain site, significant seasonal changes in soil water content and ambient temperature (T) were associated with changes in MA, foliar N, A and stomatal conductance. RD measured at the prevailing daily T and in instantaneous RT responses, displayed signs of partial acclimation and was not significantly affected by time of year. RL was always less than, and strongly related to, RD, and RL/RD did not vary significantly or systematically with seasonal changes in T or soil water content. Averaged over the year, RL/RD was 0.66 ± 0.05 s.e. (n = 14) at the central Spain site. At the north-eastern Spain site, the soil moisture gradient was characterised by increasing MA and RD, and reduced foliar N, A, and stomatal conductance as soil water availability decreased. Light inhibition of R occurred across all sites (mean RL/RD = 0.69 ± 0.01 s.e. (n = 18)), resulting in ratios of RL/A being lower than for RD/A. Importantly, the degree of light inhibition was largely insensitive to changes in soil water content. Our findings provide evidence for a relatively constrained degree of light inhibition of R (RL/RD ~ 0.7, or inhibition of ~30%) across gradients of water availability, although the combined impacts of seasonal changes in both T and soil water content increase the range of values expressed. The findings thus have implications in terms of the assumptions made by predictive models that seek to account for light inhibition of R, and for our understanding of how environmental gradients impact on leaf trait relationships in Mediterranean plant communities.

Additional keywords: Kok effect, leaf functional traits, leaf dark respiration, leaf light respiration, leaf mass per unit area, nitrogen, photosynthesis, plasticity, season, soil moisture, temperature.


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