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<title>UTas ePrints - Imbricacy and Stomatal Wax Plugs Reduce Maximum Leaf Conductance in Southern Hemisphere Conifers</title>
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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="2007-12-10 21:52:40" name="eprints.datestamp" />
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<meta content="Imbricacy and Stomatal Wax Plugs
Reduce Maximum Leaf Conductance
in Southern Hemisphere Conifers" name="eprints.title" />
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<meta content="An examination of the relationship between theoretical maximum leaf conductance as calculated from
stomatal dimensions, and measured maximum leaf conductance was undertaken in a group of Southern
Hemisphere conifers. The relative effects of stomatal wax plugs, found in most species of conifers in the
Southern Hemisphere, and imbricate leaf arrangement were expressed as a percentage inhibition of
maximum leaf conductance (gmax) calculated from the ratio of measured gmax to theoretical gmax.
Because of the similar stomatal dimensions of all species, measured gmax was proportional to stomatal
density in plugged and unplugged species, with species without wax plugs producing maximum leaf
conductances on average 91% of calculated gmax, while in species with plugged stomata measured gmax
was on average only 35% of theoretical gmax. There was no effect produced by imbricacy in itself, but
when combined with epistomy, gmax was significantly reduced to about 17% of theoretical gmax. This is
clearly illustrated by comparisons of juvenile–adult foliage, and closely related imbricate and nonimbricate
species. The adaptational advantages of imbricacy and wax plugs, and the potential for
inferring gmax of fossil taxa are discussed." name="eprints.abstract" />
<meta content="1997" name="eprints.date" />
<meta content="published" name="eprints.date_type" />
<meta content="Australian Journal of Botany" name="eprints.publication" />
<meta content="45" name="eprints.volume" />
<meta content="4" name="eprints.number" />
<meta content="657-668" name="eprints.pagerange" />
<meta content="10.1071/BT96060" name="eprints.id_number" />
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<meta content="Beerling, D. J., and Chaloner, W. G. (1993). Evolutionary response of stomatal density to global CO2
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Mihaich, C. M. (1989) Leaf and epicuticular waxes in the taxonomy of the Epacridaceae. PhD Thesis,
University of Tasmania.
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the British flora. Biological Journal of the Linnean Society 52, 377–393.
Smith, W. K., and McClean, T. M. (1989). Adaptive relationship between leaf water repellency,
stomatal distribution, and gas exchange. American Journal of Botany 76, 465–469.
Van der Water, P. K., Leavitt, S. W., and Betancourt, J. L. (1994). Trends in stomatal density and
13C/12C ratios in Pinus flexilis needles during the last glacial-interglacial cycle. Science
264, 239–243.
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Avena fatua L. observed by low-temperature scanning electron microscopy. Plant Cell and
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Australian Systematic Botany 2, 369–386.
Wells, P.M., and Hill, R.S. (1989b). Fossil imbricate-leaved Podocarpaceae from Tertiary sediments in
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Nature 327, 617–618.
Ylimartimo A., Paakkonen E., Halopainen T., and Rita H. (1994). Unbalanced nutrient status and
epicuticular wax deposition of Scots pine. Canadian Journal of Forest Research 24, 522–532." name="eprints.referencetext" />
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Reduce Maximum Leaf Conductance
in Southern Hemisphere Conifers" name="DC.title" />
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<meta content="An examination of the relationship between theoretical maximum leaf conductance as calculated from
stomatal dimensions, and measured maximum leaf conductance was undertaken in a group of Southern
Hemisphere conifers. The relative effects of stomatal wax plugs, found in most species of conifers in the
Southern Hemisphere, and imbricate leaf arrangement were expressed as a percentage inhibition of
maximum leaf conductance (gmax) calculated from the ratio of measured gmax to theoretical gmax.
Because of the similar stomatal dimensions of all species, measured gmax was proportional to stomatal
density in plugged and unplugged species, with species without wax plugs producing maximum leaf
conductances on average 91% of calculated gmax, while in species with plugged stomata measured gmax
was on average only 35% of theoretical gmax. There was no effect produced by imbricacy in itself, but
when combined with epistomy, gmax was significantly reduced to about 17% of theoretical gmax. This is
clearly illustrated by comparisons of juvenile–adult foliage, and closely related imbricate and nonimbricate
species. The adaptational advantages of imbricacy and wax plugs, and the potential for
inferring gmax of fossil taxa are discussed." name="DC.description" />
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<h1 class="ep_tm_pagetitle">Imbricacy and Stomatal Wax Plugs Reduce Maximum Leaf Conductance in Southern Hemisphere Conifers</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> (1997) <xhtml:em>Imbricacy and Stomatal Wax Plugs Reduce Maximum Leaf Conductance in Southern Hemisphere Conifers.</xhtml:em> Australian Journal of Botany, 45 (4). pp. 657-668. ISSN 0067-1924</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/2649/1/stomatal_plugs.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/2649/1/stomatal_plugs.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />481Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="3473" 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/10.1071/BT96060">http://dx.doi.org/10.1071/BT96060</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">An examination of the relationship between theoretical maximum leaf conductance as calculated from
stomatal dimensions, and measured maximum leaf conductance was undertaken in a group of Southern
Hemisphere conifers. The relative effects of stomatal wax plugs, found in most species of conifers in the
Southern Hemisphere, and imbricate leaf arrangement were expressed as a percentage inhibition of
maximum leaf conductance (gmax) calculated from the ratio of measured gmax to theoretical gmax.
Because of the similar stomatal dimensions of all species, measured gmax was proportional to stomatal
density in plugged and unplugged species, with species without wax plugs producing maximum leaf
conductances on average 91% of calculated gmax, while in species with plugged stomata measured gmax
was on average only 35% of theoretical gmax. There was no effect produced by imbricacy in itself, but
when combined with epistomy, gmax was significantly reduced to about 17% of theoretical gmax. This is
clearly illustrated by comparisons of juvenile–adult foliage, and closely related imbricate and nonimbricate
species. The adaptational advantages of imbricacy and wax plugs, and the potential for
inferring gmax of fossil taxa are discussed.</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">Subjects:</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">2649</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">11 Dec 2007 08:52</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">09 Jan 2008 02:30</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=2649;">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=2649">item control page</a></p>
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