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<meta content="Kern, Steven O." name="eprints.creators_name" />
<meta content="Hovenden, Mark J." name="eprints.creators_name" />
<meta content="Jordan, Gregory J." name="eprints.creators_name" />
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<meta content="Mark.Hovenden@utas.edu.au" name="eprints.creators_id" />
<meta content="greg.jordan@utas.edu.au" name="eprints.creators_id" />
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<meta content="2007-09-03" name="eprints.datestamp" />
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<meta content="The impacts of leaf shape and arrangement on light interception and potential photosynthesis in southern beech (Nothofagus cunninghamii)" name="eprints.title" />
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<meta content="assimilation, leaf morphology, photoprotection, phyllotaxy, self-shading" name="eprints.keywords" />
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<meta content="The impact of differences in leaf shape, size and arrangement on the efficiency of light interception, and in particular the avoidance of photoinhibition, are poorly understood. We therefore estimated light exposure of branches in the cool temperate rainforest tree, Nothofagus cunninghamii (Hook.) Oerst., in which leaf shape, size and arrangement vary systematically with altitude and geographic origin. Measurements of incident photosynthetic photon flux density (PPFD) were made in the laboratory at solar angles corresponding to noon at summer solstice, winter solstice and equinox on branches collected from a common garden experiment. Tasmanian plants showed more self-shading than Victorian plants in summer and equinox. This was related to branch angle, leaf arrangement and leaf shape. Using a modelled light response-curve, we estimated the carbon assimilation rate and the flux density of excess photons at different incident PPFD. Victorian plants had higher predicted assimilation rates than Tasmanian plants in summer and equinox, but were exposed to substantially greater levels of excess photons. Because of the shape of the light-response curve, self-shading appears to reduce the plant's exposure to excess photons, thus providing photoprotection, without substantially reducing the carbon assimilation rate. This is dependent on both regional origin and season." name="eprints.abstract" />
<meta content="2004" name="eprints.date" />
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<meta content="Functional Plant Biology" name="eprints.publication" />
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<meta content="5" name="eprints.number" />
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<meta content="10.1071/FP03211" name="eprints.id_number" />
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Self-shading, carbon gain and leaf dynamics: A test of alternative optimality models
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Leaf dynamics, self-shading and carbon gain in seedlings of a tropical pioneer tree
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Barros, M.P., PederseÃŒÂn, M., Colepicolo, P., Snoeijs, P.
Self-shading protects phytoplankton communities against H2O2-induced oxidative damage
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Leaf size and angle vary widely across species: What consequences for light interception?
(2003) New Phytologist, 158 (3), pp. 509-525. Cited 39 times.
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Altitude of origin influences stomatal conductance and therefore maximum assimilation rate in Southern Beech, Nothofagus cunninghamii
(2000) Australian Journal of Plant Physiology, 27 (5), pp. 451-456. Cited 12 times.
Hovenden, M.J., Vander Schoor, J.K.
Nature vs nurture in the leaf morphology of Southern beech, Nothofagus cunninghamii (Nothofagaceae)
(2004) New Phytologist, 161 (2), pp. 585-594. Cited 8 times.
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Moa ghosts exorcised? New Zealand's divaricate shrubs avoid photoinhibition
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Phenological and morphological adaptations to the light environment in two woody and two herbaceous plant species
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Relationships between branch spacing, growth rate and light in tropical forest saplings
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(2002) American Journal of Botany, 89 (12), pp. 1925-1932. Cited 23 times.
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Pulse EPR and ENDOR studies of light-induced radicals and triplet states in photosystem II of oxygenic photosynthesis
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The effect of leaf removal and canopy height on whole-vine gas exchange and fruit development of Vitis vinifera L. Sauvignon Blanc
(2003) Functional Plant Biology, 30 (6), pp. 711-717. Cited 2 times.
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The functional significance of leaf structure: A search for generalizations
(1999) New Phytologist, 143 (1), pp. 213-219. Cited 18 times.
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Partitioning of transfer and carboxylation components of intracellular resistance to photosynthetic CO2 fixation: A critical analysis of the methods used
(1977) Ann. Bot., 41, pp. 789-800.
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Extension of a Farquhar model for limitations of leaf photosynthesis induced by light environment, phenology and leaf age in grapevines (Vitis vinifera L. cvv. White Riesling and Zinfandel)
(2003) Functional Plant Biology, 30 (6), pp. 673-687. Cited 8 times.
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The functional ecology of shoot architecture in sun and shade plants of Heteromeles arbutifolia M. Roem., a Californian chaparral shrub
(1998) Oecologia, 114 (1), pp. 1-10. Cited 50 times." name="eprints.referencetext" />
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<meta content="The impact of differences in leaf shape, size and arrangement on the efficiency of light interception, and in particular the avoidance of photoinhibition, are poorly understood. We therefore estimated light exposure of branches in the cool temperate rainforest tree, Nothofagus cunninghamii (Hook.) Oerst., in which leaf shape, size and arrangement vary systematically with altitude and geographic origin. Measurements of incident photosynthetic photon flux density (PPFD) were made in the laboratory at solar angles corresponding to noon at summer solstice, winter solstice and equinox on branches collected from a common garden experiment. Tasmanian plants showed more self-shading than Victorian plants in summer and equinox. This was related to branch angle, leaf arrangement and leaf shape. Using a modelled light response-curve, we estimated the carbon assimilation rate and the flux density of excess photons at different incident PPFD. Victorian plants had higher predicted assimilation rates than Tasmanian plants in summer and equinox, but were exposed to substantially greater levels of excess photons. Because of the shape of the light-response curve, self-shading appears to reduce the plant's exposure to excess photons, thus providing photoprotection, without substantially reducing the carbon assimilation rate. This is dependent on both regional origin and season." name="DC.description" />
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<h1 class="ep_tm_pagetitle">The impacts of leaf shape and arrangement on light interception and potential photosynthesis in southern beech (Nothofagus cunninghamii)</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Kern, Steven O.</span> and <span class="person_name">Hovenden, Mark J.</span> and <span class="person_name">Jordan, Gregory J.</span> (2004) <xhtml:em>The impacts of leaf shape and arrangement on light interception and potential photosynthesis in southern beech (Nothofagus cunninghamii).</xhtml:em> Functional Plant Biology, 31 (5). pp. 471-480.</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/1795/1/Kern_et_al_FPB-published.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/1795/1/Kern_et_al_FPB-published.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />133Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="2272" 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/FP03211">http://dx.doi.org/10.1071/FP03211</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">The impact of differences in leaf shape, size and arrangement on the efficiency of light interception, and in particular the avoidance of photoinhibition, are poorly understood. We therefore estimated light exposure of branches in the cool temperate rainforest tree, Nothofagus cunninghamii (Hook.) Oerst., in which leaf shape, size and arrangement vary systematically with altitude and geographic origin. Measurements of incident photosynthetic photon flux density (PPFD) were made in the laboratory at solar angles corresponding to noon at summer solstice, winter solstice and equinox on branches collected from a common garden experiment. Tasmanian plants showed more self-shading than Victorian plants in summer and equinox. This was related to branch angle, leaf arrangement and leaf shape. Using a modelled light response-curve, we estimated the carbon assimilation rate and the flux density of excess photons at different incident PPFD. Victorian plants had higher predicted assimilation rates than Tasmanian plants in summer and equinox, but were exposed to substantially greater levels of excess photons. Because of the shape of the light-response curve, self-shading appears to reduce the plant's exposure to excess photons, thus providing photoprotection, without substantially reducing the carbon assimilation rate. This is dependent on both regional origin and season.</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 online at http://www.publish.csiro.au/nid/102.htm</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">assimilation, leaf morphology, photoprotection, phyllotaxy, self-shading</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></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">1795</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">03 Sep 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">11 Feb 2008 11:16</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=1795;">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=1795">item control page</a></p>
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