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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 21:28:06" name="eprints.datestamp" />
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<meta content="Light response characteristics of a morphologically diverse group
of southern hemisphere conifers as measured
by chlorophyll fluorescence" name="eprints.title" />
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<meta content="chlorophyll fluorescence; light response; leaf morphology; shade adaptation; conifers " name="eprints.keywords" />
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<meta content="Unlike northern hemisphere conifer families, the southern family, Podocarpaceae, produces a great variety of foliage forms ranging from functionally broad-, to needle-leaved. The production of broad photosynthetic surfaces in podocarps has been linked qualitatively to low-light-environments, and we undertook to assess the validity of this assumption by measuring the light response of a morphologically diverse group of podocarps. The light response, as apparent photochemical electron transport rate (ETR), was measured by modulated fluorescence in ten species of this family and six associated species (including five Cupressaceae and one functionally needle-leaved angiosperm) all grown under identical glasshouse conditions. In all species, ETR was found to increase as light intensity increased, reaching a peak value (ETR(max)) at saturating quantum flux (PPFDsat), and decreasing thereafter. ETR(max) ranged from 217 mu mol electrons . m(-2). s(-1) at a PPFDsat of 1725 mu mol photons . m(-2). s(-1) in Actinostrobus acuminatus to an ETR of 60 mu mol electrons . m(-2). s(-1) at a PPFDsat of 745 mu mol electrons . m(-2). s(-1) in Podocarpus dispermis. Good correlations were observed between ETR(max) and both PPFDsat and maximum assimilation rate measured by gas-exchange analysis. The effective quantum yield at light saturation remained constant in all species with an average value of 0.278 +/- 0.0035 determined for all 16 species. Differences in the shapes of light response curves were related to differences in the response of non-photochemical quenching (q(n)), with q(n) saturating faster in species with low PPFDsat. Amongst the species of Podocarpaceae, the log of average shoot width was well correlated with PPFDsat, wider leaves saturating at lower light intensities. This suggests that broadly flattened shoots in the Podocarpaceae are an adaptation to low light intensity. " name="eprints.abstract" />
<meta content="1997" name="eprints.date" />
<meta content="published" name="eprints.date_type" />
<meta content="Oecologia" name="eprints.publication" />
<meta content="110" name="eprints.volume" />
<meta content="1" name="eprints.number" />
<meta content="10-17" name="eprints.pagerange" />
<meta content="10.1007/s004420050127" name="eprints.id_number" />
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<meta content="0029-8549" name="eprints.issn" />
<meta content="http://dx.doi.org/10.1007/s004420050127" name="eprints.official_url" />
<meta content="Bilger W, Schreiber U, Brock M (1995) Determination of the
quantum efficiency of photosystem II and of non-p
quenching of chlorophyll ¯uorescence in the ®eld. Oecologia
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pp 10±29
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16
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pp 499±537
Yun JI, Taylor SE (1986) Adaptive implications of leaf thickness
for sun- and shade-grown Abutilon theophrasti. Ecology 67:
1314±131" name="eprints.referencetext" />
<meta content="Brodribb, Tim J. and Hill, Robert S. (1997) Light response characteristics of a morphologically diverse group of southern hemisphere conifers as measured by chlorophyll fluorescence. Oecologia, 110 (1). pp. 10-17. ISSN 0029-8549" name="eprints.citation" />
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of southern hemisphere conifers as measured
by chlorophyll fluorescence" name="DC.title" />
<meta content="Brodribb, Tim J." name="DC.creator" />
<meta content="Hill, Robert S." name="DC.creator" />
<meta content="270402 Plant Physiology" name="DC.subject" />
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<meta content="Unlike northern hemisphere conifer families, the southern family, Podocarpaceae, produces a great variety of foliage forms ranging from functionally broad-, to needle-leaved. The production of broad photosynthetic surfaces in podocarps has been linked qualitatively to low-light-environments, and we undertook to assess the validity of this assumption by measuring the light response of a morphologically diverse group of podocarps. The light response, as apparent photochemical electron transport rate (ETR), was measured by modulated fluorescence in ten species of this family and six associated species (including five Cupressaceae and one functionally needle-leaved angiosperm) all grown under identical glasshouse conditions. In all species, ETR was found to increase as light intensity increased, reaching a peak value (ETR(max)) at saturating quantum flux (PPFDsat), and decreasing thereafter. ETR(max) ranged from 217 mu mol electrons . m(-2). s(-1) at a PPFDsat of 1725 mu mol photons . m(-2). s(-1) in Actinostrobus acuminatus to an ETR of 60 mu mol electrons . m(-2). s(-1) at a PPFDsat of 745 mu mol electrons . m(-2). s(-1) in Podocarpus dispermis. Good correlations were observed between ETR(max) and both PPFDsat and maximum assimilation rate measured by gas-exchange analysis. The effective quantum yield at light saturation remained constant in all species with an average value of 0.278 +/- 0.0035 determined for all 16 species. Differences in the shapes of light response curves were related to differences in the response of non-photochemical quenching (q(n)), with q(n) saturating faster in species with low PPFDsat. Amongst the species of Podocarpaceae, the log of average shoot width was well correlated with PPFDsat, wider leaves saturating at lower light intensities. This suggests that broadly flattened shoots in the Podocarpaceae are an adaptation to low light intensity. " name="DC.description" />
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<h1 class="ep_tm_pagetitle">Light response characteristics of a morphologically diverse group of southern hemisphere conifers as measured by chlorophyll fluorescence</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>Light response characteristics of a morphologically diverse group of southern hemisphere conifers as measured by chlorophyll fluorescence.</xhtml:em> Oecologia, 110 (1). pp. 10-17. ISSN 0029-8549</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/2648/1/Oecol__conifer__light.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/2648/1/Oecol__conifer__light.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />419Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="3471" 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/10.1007/s004420050127">http://dx.doi.org/10.1007/s004420050127</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Unlike northern hemisphere conifer families, the southern family, Podocarpaceae, produces a great variety of foliage forms ranging from functionally broad-, to needle-leaved. The production of broad photosynthetic surfaces in podocarps has been linked qualitatively to low-light-environments, and we undertook to assess the validity of this assumption by measuring the light response of a morphologically diverse group of podocarps. The light response, as apparent photochemical electron transport rate (ETR), was measured by modulated fluorescence in ten species of this family and six associated species (including five Cupressaceae and one functionally needle-leaved angiosperm) all grown under identical glasshouse conditions. In all species, ETR was found to increase as light intensity increased, reaching a peak value (ETR(max)) at saturating quantum flux (PPFDsat), and decreasing thereafter. ETR(max) ranged from 217 mu mol electrons . m(-2). s(-1) at a PPFDsat of 1725 mu mol photons . m(-2). s(-1) in Actinostrobus acuminatus to an ETR of 60 mu mol electrons . m(-2). s(-1) at a PPFDsat of 745 mu mol electrons . m(-2). s(-1) in Podocarpus dispermis. Good correlations were observed between ETR(max) and both PPFDsat and maximum assimilation rate measured by gas-exchange analysis. The effective quantum yield at light saturation remained constant in all species with an average value of 0.278 +/- 0.0035 determined for all 16 species. Differences in the shapes of light response curves were related to differences in the response of non-photochemical quenching (q(n)), with q(n) saturating faster in species with low PPFDsat. Amongst the species of Podocarpaceae, the log of average shoot width was well correlated with PPFDsat, wider leaves saturating at lower light intensities. This suggests that broadly flattened shoots in the Podocarpaceae are an adaptation to low light intensity. </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 original publication is available at www.springerlink.com
</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">chlorophyll fluorescence; light response; leaf morphology; shade adaptation; conifers </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">ID Code:</th><td valign="top" class="ep_row">2648</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 08:28</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=2648;">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=2648">item control page</a></p>
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