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Annals of Botany 86: 765-769, 2000
© 2000 Annals of Botany Company

Cuticles of Vascular Epiphytes: Efficient Barriers for Water Loss after Stomatal Closure?

S. Helbsing, M. Riederer and G. Zotz+

Lehrstuhl für Botanik II der Universität Würzburg, D-97082, Würzburg, Germany Smithsonian Tropical Research Institute, Apdo, 2072, Balboa, Panama

Received: 18 November 1999 ; Returned for revision: 14 February 2000 . Accepted: 16 June 2000

Water permeabilities of astomatous, isolated cuticular membranes of 15 vascular epiphyte species (families: Araceae, Orchidaceae and Piperaceae) from the moist lowland forest of Barro Colorado Nature Monument, Panama, were investigated. Permeances determined at 30°C ranged from 0.46 x 10-6 m s-1(Aspasia principissa(Rchb. f.) R.E. Schult.) to 6.07 x 10-6 m s-1(Polystachya foliosa(Hook.) Rchb. f.). Comparison of these data with permeances of plants from other habitats corroborates the notion that cuticular properties reflect the climatic demands of the growing sites. The studied group of vascular epiphytes, living in a very drought-prone habitat, showed the lowest cuticular permeances to water recorded to date. Copyright 2000 Annals of Botany Company

Barro Colorado Island, cuticular transpiration, epiphyte, plant water relations, transport barrier


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