Acclimation or stress symptom? An integrated study of intraspecific variation in the clonal plant Aechmea bromeliifolia, a widespread CAM tank-bromeliad

Autor: Tânia Wendt, André Mantovani, Helena Regina Pinto Lima, Fabio Rubio Scarano, E. F. Amado, Heitor M. Duarte, Giselle Rôças, Fernanda Reinert, Suzanne Barreto, Claudia Franca Barros
Rok vydání: 2002
Předmět:
Zdroj: ResearcherID
ISSN: 1095-8339
0024-4074
DOI: 10.1046/j.1095-8339.2002.00112.x
Popis: The clonal tank-bromeliad Aechmea bromeliifolia (Rudge) Baker was found in four different habitats in a restinga (vegetation mosaic on sandy coastal plains), of south-eastern Brazil. These habitats (swamp forest, dry forest, dry shrubland and herbaceous marsh) lie within a few hundred metres of each other along a gradient extending inland from the coast, and differ markedly in terms of light and flood regime. We compared ramet morphology, leaf anatomy and physiology, and population parameters to examine the amplitude of trait variation of this widespread species in the studied restinga. This integrated approach allowed us to examine which variation conferred acclimation and which was merely a stress symptom. A. bromeliifolia showed site-specific differences in abundance, distribution, rosette size and shape, leaf anatomical arrangement and photochemical efficiency (potential quantum yield; Fv/Fm) during the day. Most of the variation found seemed to be related to the interaction of light and flooding. The lowest number and size of ramets at the exposed, dry shrubland was matched by a marked leaf photoinhibition, which suggested poor acclimation to local levels of light intensity and limited water supply. In the other habitats, the morpho-physiological parameters measured suggested adequate foraging behaviour and site acclimation. © 2002 The Linnean Society of London, Botanical Journal of the Linnean Society, 2002, 140, 391-401.
Databáze: OpenAIRE
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