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<meta content="Brodribb, Tim J." name="eprints.creators_name" />
<meta content="Hill, Robert S." name="eprints.creators_name" />
<meta content="Timothy.Brodribb@utas.edu.au" name="eprints.creators_id" />
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<meta content="The photosynthetic drought physiology of a diverse group of southern hemisphere conifer species is correlated with minimum seasonal rainfall
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<meta content="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.
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<meta content="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.
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<h1 class="ep_tm_pagetitle">The photosynthetic drought physiology of a diverse group of southern hemisphere conifer species is correlated with minimum seasonal rainfall</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Brodribb, Tim J.</span> and <span class="person_name">Hill, Robert S.</span> (1998) <xhtml:em>The photosynthetic drought physiology of a diverse group of southern hemisphere conifer species is correlated with minimum seasonal rainfall.</xhtml:em> Functional Ecology, 12 (3). pp. 465-471. ISSN 0269-8463</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a href="http://eprints.utas.edu.au/2647/1/Funct__ecol.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/2647/1/Funct__ecol.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />124Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="3470" name="docid" type="hidden" /><div class=""><input value="Request a copy" name="_action_null" class="ep_form_action_button" onclick="return EPJS_button_pushed( '_action_null' )" type="submit" /> </div></form></td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1046/j.1365-2435.1998.00213.x">http://dx.doi.org/10.1046/j.1365-2435.1998.00213.x</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">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.
</p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Additional Information:</th><td valign="top" class="ep_row">The definitive version is available at www.blackwell-synergy.com
</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">carbon-13 discrimination; drought response; photosynthetic gas exchange; water-use efficiency </td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/270402.html">270000 Biological Sciences > 270400 Botany > 270402 Plant Physiology</a><br /><a href="http://eprints.utas.edu.au/view/subjects/270400.html">270000 Biological Sciences > 270400 Botany</a></td></tr><tr><th valign="top" class="ep_row">Collections:</th><td valign="top" class="ep_row">UNSPECIFIED</td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">2647</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Scholarly Publications Librarian</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">10 Dec 2007 14:33</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">11 Feb 2008 11:29</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=2647;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&eprintid=2647">item control page</a></p>
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