biologia plantarum

International journal on Plant Life established by Bohumil Nìmec in 1959

Biologia plantarum 51:741-745, 2007 | DOI: 10.1007/s10535-007-0151-4

Chlorophyll fluorescence parameters of three Mediterranean shrubs in a summer-autumn period in central Portugal

J. Marques da Silva1,*
1 Faculdade de Ciências, Departamento de Biologia Vegetal/Centro de Engenharia Biológica Edifício C2, Universidade de Lisboa, Lisboa, Portugal

The photosynthetic performance of Cistus crispus, Centaurea africana and Thymus villosus, three shrubs of the Mediterranean-type maquis vegetation of Central Portugal, were studied between July and December 2003 by means of in vivo chlorophyll a fluorescence measurements. In C. africana total leaf decay occurred between August and October, in T. villosus no clear pattern of variation of the basal fluorescence (Fo) was observed, and in C. crispus an increase of this parameter was observed in late autumn. In all species, the limitation to photosynthesis by photoinhibition and the contribution of non-reversible processes to total photoinhibition were more pronounced in the summer than in the autumn. However, a pronounced decrease of the effective quantum yield of photosystem 2 (ΦPS2) was found in late autumn, probably due to a decrease of the carboxylation efficiency of the Calvin-Benson cycle, which was also supported by a parallel decrease of the photochemical quenching coefficient (qP).

Keywords: Centaurea africana; Cistus crispus; Mediterranean climate; photoinhibition; photosynthetic performance; Thymus villosus
Subjects: Centaurea africana; chlorophyll fluorescence; Cistus crispus; gas exchange; photoinhibition; Thymus villosus

Received: January 22, 2005; Accepted: June 30, 2007; Published: December 1, 2007  Show citation

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da Silva, J.M. (2007). Chlorophyll fluorescence parameters of three Mediterranean shrubs in a summer-autumn period in central Portugal. Biologia plantarum, 51(4), 741-745. doi: 10.1007/s10535-007-0151-4
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