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Journal of Experimental Botany, Vol 50, 869-872, Copyright © 1999 by Oxford University Press

ARTICLES

Short communication. A high level of atmospheric oxygen, as occurred toward the end of the Cretaceous period, increases leaf diffusion conductance

S Rachmilevitch, J Reuveni, R Pearcy and J Gale
Department of Plant Sciences, Inst. Life Sciences, Hebrew University of Jerusalem, Jerusalem, 91904, Israel; Section of Evolution and Ecology, Department of Biology, University of California, Davis, CA 95616, USA; Corresponding author; Fax: +972 2 6523750; E-mail: galej@vms.huji.ac.il

Leaf diffusion conductance much increased when Xanthium strumarium (C3), Atriplex prostata (C3) and Flaveria pringlei (C3), F. sonorensis (C3/C4), F. floridana (C3/C4), and F. trinervia (C4) plants were grown under relatively high (28 kPa) ambient oxygen. This phenomenon, which increases sensitivity to water stress, could have adversely affected vegetation during the late Cretaceous, high O2 episode.Keywords: Palaeo-atmosphere, stomata, oxygen, Cretaceous.
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