Journal of Experimental Botany, Vol 49, 1603-1607, Copyright © 1998 by Oxford University Press
D Beerling, J McElwain and C Osborne
Leaf stomatal density and index of Ginkgo biloba L.
were both significantly (P<0.05) reduced after
3 years growth at elevated CO2 (560 ppm), with values comparable to those
of cuticles prepared from Triassic and Jurassic fossil
Ginkgo leaves thought to have developed in the high
CO2 'greenhouse world' of the Mesozoic. A reciprocal transfer experiment
indicated that reductions in stomatal density and index irreversibly
reduced stomatal conductance, particularly at low leaf-to-air vapour
pressure deficits and low internal leaf CO2 concentrations
(Ci). These effects probably contributed to the high
water-use efficiency of Ginkgo spp. in the Mesozoic
relative to those of the present, as determined from carbon isotope
measurements of extant and fossil cuticles.Keywords:
Stomata, gas exchange, elevated CO2, fossils.
ARTICLES
Short communication. Stomatal responses of the 'living fossil' Ginkgo biloba L. to changes in atmospheric CO2 concentrations
Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK; Corresponding author; Fax: +44 114 276 0159; E-mail: D.J.Beerling@Sheffield.ac.uk
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