Responses of photosynthesis and component processes to drought and temperature stress: are Mediterranean trees fit for climate change?

被引:28
作者
Sperlich, D. [1 ]
Chang, C. T. [2 ,3 ]
Penuelas, J. [3 ,4 ]
Sabate, S. [2 ,3 ]
机构
[1] Univ Freiburg, Fac Environm & Nat Resources, Chair Forestry Econ & Forest Planning, Tennenbacherstr 4, D-79085 Freiburg, Germany
[2] Univ Barcelona, Dept Evolutionary Biol Ecol & Environm Sci BEECA, Ave Diagonal 643, E-08028 Barcelona, Spain
[3] CREAF, Barcelona 08193, Catalonia, Spain
[4] UAB, CSIC, CREAF, Global Ecol Unit, Barcelona 08193, Spain
基金
欧洲研究理事会;
关键词
Arbutus unedo; electron-transport rate (J); mesophyllic conductance (g(m)); Pinus halepensis; Quercus ilex; Quercus pubescens; stomatal conductance (g(s)); temperature response curves; BIOCHEMICALLY BASED MODEL; MESOPHYLL CONDUCTANCE; QUERCUS-ILEX; INTERNAL CONDUCTANCE; FOLIAR RESPIRATION; ELECTRON-TRANSPORT; NET PHOTOSYNTHESIS; GAS-EXCHANGE; INTERSPECIFIC DIFFERENCES; DIFFUSION CONDUCTANCE;
D O I
10.1093/treephys/tpz089
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
Global warming is raising concerns about the acclimatory capacity of trees and forests, especially in Mediterranean-type ecosystems. The sensitivity of photosynthesis to temperature is a key uncertainty for projecting the magnitude of terrestrial feedbacks on future climate change. While boreal, temperate and tropical species have been comparatively well investigated, our study provides the first comprehensive overview of the seasonal acclimatory responses of photosynthesis and its component processes to temperature in four Mediterranean climax species under natural conditions. We quantified seasonal changes in the responses of net photosynthesis (A(net)), stomatal conductance (g(s)), mesophyllic conductance (g(m)) and electron-transport rate (J(cf)), and investigated their sensitivity to drought and temperature stress in sunlit and shaded leaves of four Mediterranean tree species (Quercus ilex L., Pinus halepensis Mill., Arbutus unedo L. and Quercus pubescens Willd.). Sunlit leaves, but not shaded leaves, showed a pronounced seasonality in the temperature responses of A(net), g(s), g(m) and J(cf). All four species and variables showed a remarkably dynamic and consistent acclimation of the thermal optimum (T-opt), reaching peaks in summer similar to 29-32 degrees C. Changes in the shape of the response curves were, however, highly species-specific. Under severe drought, T-opt of all variables were on average 22-29% lower. This was accompanied by narrower response curves above all in P. halepensis, reducing the optimal range for photosynthesis to the cooler morning or evening periods. Wider temperature-response curves and less strict stomatal control under severe drought were accompanied by wilting and drought-induced leaf shedding in Q. ilex and Q. pubescens and by additional branch dieback in A. unedo. Mild winter conditions led to a high T-opt (similar to 19.1-22.2 degrees C), benefitting the evergreen species, especially P. halepensis. Seasonal acclimation of A(net) was explained better by g(s) and g(m) being less pronounced in J(cf). Drought was thus a key factor, in addition to growth temperature, to explain seasonal acclimation of photosynthesis. Severe drought periods may exceed more frequently the high acclimatory capacity of Mediterranean trees to high ambient temperatures, which could lead to reduced growth, increased leaf shedding and, for some species such as A. unedo, increased mortality risk.
引用
收藏
页码:1783 / 1805
页数:23
相关论文
共 47 条
[41]   Effects of elevated ozone on photosynthesis and stomatal conductance of two soybean varieties: a case study to assess impacts of one component of predicted global climate change [J].
Singh, E. ;
Tiwari, S. ;
Agrawal, M. .
PLANT BIOLOGY, 2009, 11 :101-108
[42]   Acclimatory responses of stomatal conductance and photosynthesis to elevated CO2 and temperature in wheat crops grown at varying levels of N supply in a Mediterranean environment [J].
Del Pozo, A ;
Pérez, P ;
Morcuende, R ;
Alonso, A ;
Martínez-Carrasco, R .
PLANT SCIENCE, 2005, 169 (05) :908-916
[43]   Ecophysiological adaptations of two halophytes to salt stress: Photosynthesis, PS II photochemistry and anti-oxidant feedback - Implications for resilience in climate change [J].
Duarte, B. ;
Santos, D. ;
Marques, J. C. ;
Cacador, I. .
PLANT PHYSIOLOGY AND BIOCHEMISTRY, 2013, 67 :178-188
[44]   A whole-tree chamber system for examining tree-level physiological responses of field-grown trees to environmental variation and climate change [J].
Medhurst, Jane ;
Parsby, Jan ;
Linder, Sune ;
Wallin, Goran ;
Ceschia, Eric ;
Slaney, Michelle .
PLANT CELL AND ENVIRONMENT, 2006, 29 (09) :1853-1869
[45]   Carbon balance, partitioning and photosynthetic acclimation in fruit-bearing grapevine (Vitis vinifera L. cv. Tempranillo) grown under simulated climate change (elevated CO2, elevated temperature and moderate drought) scenarios in temperature gradient greenhouses [J].
Salazar-Parra, Carolina ;
Aranjuelo, Iker ;
Pascual, Inmaculada ;
Erice, Gorka ;
Sanz-Saez, Alvaro ;
Aguirreolea, Jone ;
Sanchez-Diaz, Manuel ;
Jose Irigoyen, Juan ;
Luis Araus, Jose ;
Morales, Fermin .
JOURNAL OF PLANT PHYSIOLOGY, 2015, 174 :97-109
[46]   Climate change (elevated CO2, elevated temperature and moderate drought) triggers the antioxidant enzymes' response of grapevine cv. Tempranillo, avoiding oxidative damage [J].
Salazar-Parra, Carolina ;
Aguirreolea, Jone ;
Sanchez-Diaz, Manuel ;
Irigoyen, Juan Jose ;
Morales, Fermin .
PHYSIOLOGIA PLANTARUM, 2012, 144 (02) :99-110
[47]   Water relations, biochemical - physiological and yield responses of olive trees (Olea europaea L. cvs. Arbequina and Manzanilla) under drought stress during the pre-flowering and flowering period [J].
Pierantozzi, Pierluigi ;
Torres, Mariela ;
Bodoira, Romina ;
Maestri, Damian .
AGRICULTURAL WATER MANAGEMENT, 2013, 125 :13-25