Journal of Experimental Botany, Vol 49, 229-238, Copyright © 1998 by Oxford University Press
J Penuelas, I Filella, J Llusia, D Siscart and J Pinol
Summer-induced changes in gas exchange, fluorescence and reflectance were
measured on leaves of two co-occurring Mediterranean small trees,
Quercus ilex and Phillyrea
latifolia, in May, June and July 1996 in Central Catalonia (NE
Spain). The humid 1996 summer only produced mild water stress conditions.
However, photosynthesis (A) and stomatal conductance
(gs) decreased in June and July in both species. In
June P. latifolia had higher net photosynthetic rates
and lower stomatal conductances than Q. ilex, thus
exhibiting higher instantaneous plant water use efficiencies. In agreement
with these results, the photochemical reflectance index
(PRI, calculated as (R570-R531)/(R531+R570)) of
P. latifolia was lower, suggesting a possible lower
xanthophyll de-epoxidation state. However, P.
latifolia had lower
ARTICLES
Comparative field study of spring and summer leaf gas exchange and photobiology of the Mediterranean trees Quercus ilex and Phyllyrea latifolia
CREAF (Centre de Recerca Ecologica i Aplicacions Forestals), Facultat de Ciencies, Universitat Autonoma de Barcelona, E-08193 Bellaterra, Barcelona, Spain; Corresponding author e-mail: penuelas@cc.uab.es
F/F'm and therefore
a lower electron transport rate (ETR). The behaviour
of PRI confirmed previous studies indicating a strong
relationship between PRI, F/F'm and
photosynthetic radiation-use efficiency (PRUE).
PRI offers a simple, portable means of assessing
PRUE with the potential for remote sensing
applications. Finally, the possible ecological consequences of these
results on the behaviour of the two species studied under the predicted
warmer and drier conditions of global change are discussed.Key
words: Quercus ilex, Phillyrea latifolia, summer, net
photosynthetic rates, stomatal conductance, intrinsic water use efficiency,
photosynthetic radiation-use-efficiency, reflectance, fluorescence,
photochemical reflectance index, photochemical efficiency, water index.
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