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The photosynthetic drought physiology of a diverse group of southern hemisphere conifer species is correlated with minimum seasonal rainfall

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Brodribb, TJ and Hill, RS (1998) The photosynthetic drought physiology of a diverse group of southern hemisphere conifer species is correlated with minimum seasonal rainfall. Functional Ecology, 12 (3). pp. 465-471. ISSN 0269-8463

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Abstract

The instantaneous and integrated leaf gas exchange of 13 species of southern hemisphere conifers grown under identical glasshouse conditions were examined to determine whether there was any correlation between the characteristics of water use at the leaf level and environmental water availability. In the conifer species examined, the minimum ratio of internal to ambient CO2 measured in leaves during artificially imposed drought [(C-i/C-a)(min)] was strongly correlated with the minimum rainfall observed within the natural range of each species. This suggests that the distributions of these species are constrained by the drought tolerance of their photosynthetic apparatus. A good correlation was found between the ratio of internal to ambient CO2 measured in leaves under optimal conditions (C-i/C-a)(max) and leaf delta(13)C (and hence inferred integral [c(i)/c(a)]). Neither of these, however, correlated with the environmental parameters considered most likely to be limiting species distribution, i.e, precipitation and altitude. These data suggest that decreasing water availability may have been the major factor responsible for the restriction and extinction of conifers in the southern hemisphere.

Item Type: Article
Keywords: carbon-13 discrimination; drought response; photosynthetic gas exchange; water-use efficiency
Journal or Publication Title: Functional Ecology
Page Range: pp. 465-471
ISSN: 0269-8463
Identification Number - DOI: 10.1046/j.1365-2435.1998.00213.x
Additional Information: The definitive version is available at www.blackwell-synergy.com
Date Deposited: 10 Dec 2007 03:33
Last Modified: 18 Nov 2014 03:25
URI: http://eprints.utas.edu.au/id/eprint/2647
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