Full TGIF Record # 81329
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Author(s):Balaguer, L.; Pugnaire, F. I.; MartĂ­nez-Ferri, E.; Armas, C.; Valladares, F.; Manrique, E.
Author Affiliation:Balaguer: Departamento de Biología Vegetal I, Facultad de Biología, Unviversidad Complutense, Madrid, Spain; Pugnaire and Armas: Estacíon Experimental de Zonas Áridas, Consejo Superior de Investigaciones Cientícas, General Segura I, Almería, Spain; Martínez-Ferri: Departamento de Biología Vegetal I and II, Facultad de Biología and Facultad de Farmacia, Universidad Complutense, Madrid, Spain, and Plant Sciences, Faculty of Agriculture, University of Western Australia, Crawley, Australia; Valladares: Centro de Ciencias Medioambientales, Consejo Superior de Investigaciones Cientícas, Madrid, Spain; Manrique: Departamento de Biología Vegetal II, Factultad de Farmacia, Universidad Complutense, Madrid, Spain
Title:Ecophysiological significance of chlorophyll loss and reduced photochemical efficiency under extreme aridity in Stipa tenacissima L.
Source:Plant and Soil. Vol. 240, No. 2, March 2002, p. 343-352.
# of Pages:10
Publishing Information:Dordrecht, Netherlands: Kluwer Academic Publishers
Related Web URL:http://link.springer.com/article/10.1023/A%3A1015745118689
    Last checked: 10/14/2015
    Notes: Abstract only
Keywords:TIC Keywords: Stipa tenacissima; Heat stress; Water deficit; Carbon dioxide; Photochemical efficiency; Pigments; Chlorophyll; Water shortage; Drought resistance; Temperatures; Light intensity; Arid climate
Abstract/Contents:"Stipa tenacissima L., a perennial tussock grass widely found in semi-arid environments of the Iberian Peninsula and North Africa, is subjected to multiple stresses during the extreme summer conditions of south-east Spain. We characterised the photoprotective mechanisms of S. tenacissima during the transition from spring to summer and autumn. S. tenacissima experienced a marked water deficit (Ψpd < -8.4 MPa) and the complete suppression of CO2 assimilation in August, associated with 72% reduction of maximal photochemical efficiency of PSII (Fv/Fm). These reduced F/v/F/m values were related to the pre-dawn maintenance of high levels of epoxidized forms of xanthophyll-cycle pigments (DPSpd, ca. 42% higher than spring values), and with a 60% reduction in the concentration of total chlorophyll (Chl a + b). These changes were associated with a low capacity of dissipation of the excitation energy non-radiatively (measured as NPQ). Leaves showed a complete recovery of Fv/Fm and xanthophyll and chlorophyll concentrations after the autumn rainfall, which reached levels similar to that of spring. This poikilohydric-type response of S. tenacissima to stress allows for a greater tolerance of water shortage, high temperature and high light intensity, which are typical in these semi-arid environments and accounts for its distinctive opportunistic growth."
Geographic Terms:Spain
See Also:Other items relating to: Disasters - Drought
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Balaguer, L., F. I. Pugnaire, E. MartĂ­nez-Ferri, C. Armas, F. Valladares, and E. Manrique. 2002. Ecophysiological significance of chlorophyll loss and reduced photochemical efficiency under extreme aridity in Stipa tenacissima L.. Plant Soil. 240(2):p. 343-352.
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