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<title>UTas ePrints - Incontinence in aging leaves: Deteriorating water relations with leaf age in Agastachys odorata R.Br. (Proteaceae), a shrub with very long-lived leaves</title>
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<meta content="Jordan, Gregory J." name="eprints.creators_name" />
<meta content="Brodribb, Tim J." name="eprints.creators_name" />
<meta content="greg.jordan@utas.edu.au" name="eprints.creators_id" />
<meta content="timothyb@utas.edu.au" name="eprints.creators_id" />
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<meta content="2007-09-02" name="eprints.datestamp" />
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<meta content="Incontinence in aging leaves: Deteriorating water relations with leaf age in Agastachys odorata R.Br. (Proteaceae), a shrub with very long-lived leaves" name="eprints.title" />
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<meta content="leaf aging, sclerophylly, scleromorphy, leaf longevity, leaf senescence" name="eprints.keywords" />
<meta content="This paper examines physiological characteristics of the leaves of Agastachys odorata, a wet-climate, sclerophyllous shrub with very long-lived leaves. It addresses the hypothesis that cuticles become leakier to water vapour as leaves age. Astomatous cuticular conductance, whole-leaf minimum epidermal conductance, leaf damage and accumulation of epiphylls all increased several-fold with leaf age from first year growth to ten years of age. Maximum carbon assimilation peaked after 1 year, then declined. Intrinsic water use efficiency was highest in mid-aged leaves and declined markedly in the oldest leaves. Stomatal density, stomatal size and cuticle thickness did not vary significantly among ages. The older leaves were less effective at controlling water loss, resulting in decreases in water use efficiency. A differential increase in the conductance of the stomatal surface of the leaves relative to astomatous surface suggested that stomatal leakiness was significant in leaves over 5 years old. Although data for other species is ambiguous, the deterioration in A. odorata appears to be consistent with changes in the oldest leaves of other species. Thus, decreasing ability to use water efficiently may contribute to the need for leaf senescence in evergreen species with little self shading." name="eprints.abstract" />
<meta content="2007" name="eprints.date" />
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<meta content="Functional Plant Biology" name="eprints.publication" />
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<meta content="Anfodillo T, Di Bisceglie DP, Urso T (2002) Minimum cuticular conductance and cuticle features of Picea abies and Pinus cerebra needles along an altitudinal gradient in the Dolomites (NE Italian Alps). Tree Physiology 22, 479-487.
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<meta content="This paper examines physiological characteristics of the leaves of Agastachys odorata, a wet-climate, sclerophyllous shrub with very long-lived leaves. It addresses the hypothesis that cuticles become leakier to water vapour as leaves age. Astomatous cuticular conductance, whole-leaf minimum epidermal conductance, leaf damage and accumulation of epiphylls all increased several-fold with leaf age from first year growth to ten years of age. Maximum carbon assimilation peaked after 1 year, then declined. Intrinsic water use efficiency was highest in mid-aged leaves and declined markedly in the oldest leaves. Stomatal density, stomatal size and cuticle thickness did not vary significantly among ages. The older leaves were less effective at controlling water loss, resulting in decreases in water use efficiency. A differential increase in the conductance of the stomatal surface of the leaves relative to astomatous surface suggested that stomatal leakiness was significant in leaves over 5 years old. Although data for other species is ambiguous, the deterioration in A. odorata appears to be consistent with changes in the oldest leaves of other species. Thus, decreasing ability to use water efficiently may contribute to the need for leaf senescence in evergreen species with little self shading." name="DC.description" />
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<h1 class="ep_tm_pagetitle">Incontinence in aging leaves: Deteriorating water relations with leaf age in Agastachys odorata R.Br. (Proteaceae), a shrub with very long-lived leaves</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Jordan, Gregory J.</span> and <span class="person_name">Brodribb, Tim J.</span> (2007) <xhtml:em>Incontinence in aging leaves: Deteriorating water relations with leaf age in Agastachys odorata R.Br. (Proteaceae), a shrub with very long-lived leaves.</xhtml:em> Functional Plant Biology, 34 . pp. 918-924. ISSN 1445-4408</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 onmouseover="EPJS_ShowPreview( event, 'doc_preview_2241' );" href="http://eprints.utas.edu.au/1748/1/final.pdf" onmouseout="EPJS_HidePreview( event, 'doc_preview_2241' );"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a><div class="ep_preview" id="doc_preview_2241"><table><tr><td><img alt="" src="http://eprints.utas.edu.au/1748/thumbnails/1/preview.png" class="ep_preview_image" border="0" /><div class="ep_preview_title">Preview</div></td></tr></table></div></td><td valign="top"><a href="http://eprints.utas.edu.au/1748/1/final.pdf"><span class="ep_document_citation">PDF (Author Version)</span></a> - Requires a PDF viewer<br />336Kb</td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://www.publish.csiro.au/nid/102.htm">http://www.publish.csiro.au/nid/102.htm</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">This paper examines physiological characteristics of the leaves of Agastachys odorata, a wet-climate, sclerophyllous shrub with very long-lived leaves. It addresses the hypothesis that cuticles become leakier to water vapour as leaves age. Astomatous cuticular conductance, whole-leaf minimum epidermal conductance, leaf damage and accumulation of epiphylls all increased several-fold with leaf age from first year growth to ten years of age. Maximum carbon assimilation peaked after 1 year, then declined. Intrinsic water use efficiency was highest in mid-aged leaves and declined markedly in the oldest leaves. Stomatal density, stomatal size and cuticle thickness did not vary significantly among ages. The older leaves were less effective at controlling water loss, resulting in decreases in water use efficiency. A differential increase in the conductance of the stomatal surface of the leaves relative to astomatous surface suggested that stomatal leakiness was significant in leaves over 5 years old. Although data for other species is ambiguous, the deterioration in A. odorata appears to be consistent with changes in the oldest leaves of other species. Thus, decreasing ability to use water efficiently may contribute to the need for leaf senescence in evergreen species with little self shading.</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">Keywords:</th><td valign="top" class="ep_row">leaf aging, sclerophylly, scleromorphy, leaf longevity, leaf senescence</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/270706.html">270000 Biological Sciences > 270700 Ecology and Evolution > 270706 Life Histories (incl. Population Ecology)</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">1748</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">dr gregory j jordan</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">02 Sep 2007</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=1748;">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=1748">item control page</a></p>
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