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  5. <title>UTas ePrints - Acclimation of Leaf Anatomy, Photosynthetic Light Use, and Xylem, Hydraulics to Light in Amborella Trichopoda (Amborellaceae)</title>
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  13. <meta content="Feild, Taylor S." name="eprints.creators_name" />
  14. <meta content="Brodribb, Tim J." name="eprints.creators_name" />
  15. <meta content="Jaffre, Tanguy" name="eprints.creators_name" />
  16. <meta content="Holbrook, N. M." name="eprints.creators_name" />
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  25. <meta content="Acclimation of Leaf Anatomy, Photosynthetic Light Use, and Xylem, Hydraulics to Light in Amborella Trichopoda (Amborellaceae)" name="eprints.title" />
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  30. <meta content="Amborella, angiosperm phylogeny, basal angiosperms, shade adaptation, xylem hydraulics." name="eprints.keywords" />
  31. <meta content="Recent phylogenetic analyses place Amborella trichopoda, a semiclimbing premontane rain forest shrub
  32. endemic to New Caledonia, as sister to all other extant flowering plants. Here we present new observations
  33. on leaf anatomy and morphology, leaf photosynthetic physiology, and xylem hydraulic function for Amborella
  34. in the field. We focus on experimental measurements of the degree of photosynthetic and xylem hydraulic
  35. acclimation to sunlight by examining Amborella plants growing in deeply shaded understories (0.7% full
  36. sunlight) compared with individuals from exposed montane ridge crests in New Caledonia. Amborella leaves
  37. exhibit few anatomical differences between sun and shade. Instead of primarily adjusting leaf anatomical
  38. characters to irradiance, A. trichopoda leaves exposed periodically to full sunlight modify their orientation,
  39. becoming folded up along the midvein, presumably to avoid increases in light interception. Chlorophyll a
  40. fluorescence measurements demonstrate that the photosynthetic apparatus of A. trichopoda is shade adapted,
  41. based on a low capacity for excess light energy dissipation and low photosynthetic electron transport rate. In
  42. addition, these characteristics exhibit limited upregulation in response to increased irradiance. In parallel,
  43. there are small or no differences in leaf area-specific hydraulic conductivity between sun and shade shoots of
  44. A. trichopoda. Taken together, A. trichopoda appears to possess limited developmental and physiological
  45. flexibility to light flux density. The bearing of these observations, in the context of other early-diverging clades
  46. of angiosperms identified by recent phylogenetic studies, on the physiological ecology of the first angiosperms
  47. is discussed." name="eprints.abstract" />
  48. <meta content="2001" name="eprints.date" />
  49. <meta content="published" name="eprints.date_type" />
  50. <meta content=" International Journal of Plant Sciences" name="eprints.publication" />
  51. <meta content="162" name="eprints.volume" />
  52. <meta content="5" name="eprints.number" />
  53. <meta content="999-1008" name="eprints.pagerange" />
  54. <meta content="10.1086/322889" name="eprints.id_number" />
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  56. <meta content="1058-5893" name="eprints.issn" />
  57. <meta content="http://dx.doi.org/10.1086/322889" name="eprints.official_url" />
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  265. <meta content="Feild, Taylor S. and Brodribb, Tim J. and Jaffre, Tanguy and Holbrook, N. M. (2001) Acclimation of Leaf Anatomy, Photosynthetic Light Use, and Xylem, Hydraulics to Light in Amborella Trichopoda (Amborellaceae). International Journal of Plant Sciences, 162 (5). pp. 999-1008. ISSN 1058-5893" name="eprints.citation" />
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  269. <meta content="Feild, Taylor S." name="DC.creator" />
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  275. <meta content="Recent phylogenetic analyses place Amborella trichopoda, a semiclimbing premontane rain forest shrub
  276. endemic to New Caledonia, as sister to all other extant flowering plants. Here we present new observations
  277. on leaf anatomy and morphology, leaf photosynthetic physiology, and xylem hydraulic function for Amborella
  278. in the field. We focus on experimental measurements of the degree of photosynthetic and xylem hydraulic
  279. acclimation to sunlight by examining Amborella plants growing in deeply shaded understories (0.7% full
  280. sunlight) compared with individuals from exposed montane ridge crests in New Caledonia. Amborella leaves
  281. exhibit few anatomical differences between sun and shade. Instead of primarily adjusting leaf anatomical
  282. characters to irradiance, A. trichopoda leaves exposed periodically to full sunlight modify their orientation,
  283. becoming folded up along the midvein, presumably to avoid increases in light interception. Chlorophyll a
  284. fluorescence measurements demonstrate that the photosynthetic apparatus of A. trichopoda is shade adapted,
  285. based on a low capacity for excess light energy dissipation and low photosynthetic electron transport rate. In
  286. addition, these characteristics exhibit limited upregulation in response to increased irradiance. In parallel,
  287. there are small or no differences in leaf area-specific hydraulic conductivity between sun and shade shoots of
  288. A. trichopoda. Taken together, A. trichopoda appears to possess limited developmental and physiological
  289. flexibility to light flux density. The bearing of these observations, in the context of other early-diverging clades
  290. of angiosperms identified by recent phylogenetic studies, on the physiological ecology of the first angiosperms
  291. is discussed." name="DC.description" />
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  403. <h1 class="ep_tm_pagetitle">Acclimation of Leaf Anatomy, Photosynthetic Light Use, and Xylem, Hydraulics to Light in Amborella Trichopoda (Amborellaceae)</h1>
  404. <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Feild, Taylor S.</span> and <span class="person_name">Brodribb, Tim J.</span> and <span class="person_name">Jaffre, Tanguy</span> and <span class="person_name">Holbrook, N. M.</span> (2001) <xhtml:em>Acclimation of Leaf Anatomy, Photosynthetic Light Use, and Xylem, Hydraulics to Light in Amborella Trichopoda (Amborellaceae).</xhtml:em> International Journal of Plant Sciences, 162 (5). pp. 999-1008. ISSN 1058-5893</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/2611/1/amborella_2.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/2611/1/amborella_2.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />431Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="3420" 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/10.1086/322889">http://dx.doi.org/10.1086/322889</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Recent phylogenetic analyses place Amborella trichopoda, a semiclimbing premontane rain forest shrub&#13;
  405. endemic to New Caledonia, as sister to all other extant flowering plants. Here we present new observations&#13;
  406. on leaf anatomy and morphology, leaf photosynthetic physiology, and xylem hydraulic function for Amborella&#13;
  407. in the field. We focus on experimental measurements of the degree of photosynthetic and xylem hydraulic&#13;
  408. acclimation to sunlight by examining Amborella plants growing in deeply shaded understories (0.7% full&#13;
  409. sunlight) compared with individuals from exposed montane ridge crests in New Caledonia. Amborella leaves&#13;
  410. exhibit few anatomical differences between sun and shade. Instead of primarily adjusting leaf anatomical&#13;
  411. characters to irradiance, A. trichopoda leaves exposed periodically to full sunlight modify their orientation,&#13;
  412. becoming folded up along the midvein, presumably to avoid increases in light interception. Chlorophyll a&#13;
  413. fluorescence measurements demonstrate that the photosynthetic apparatus of A. trichopoda is shade adapted,&#13;
  414. based on a low capacity for excess light energy dissipation and low photosynthetic electron transport rate. In&#13;
  415. addition, these characteristics exhibit limited upregulation in response to increased irradiance. In parallel,&#13;
  416. there are small or no differences in leaf area-specific hydraulic conductivity between sun and shade shoots of&#13;
  417. A. trichopoda. Taken together, A. trichopoda appears to possess limited developmental and physiological&#13;
  418. flexibility to light flux density. The bearing of these observations, in the context of other early-diverging clades&#13;
  419. of angiosperms identified by recent phylogenetic studies, on the physiological ecology of the first angiosperms&#13;
  420. is 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">Keywords:</th><td valign="top" class="ep_row">Amborella, angiosperm phylogeny, basal angiosperms, shade adaptation, xylem hydraulics.</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 &gt; 270400 Botany &gt; 270402 Plant Physiology</a><br /><a href="http://eprints.utas.edu.au/view/subjects/270400.html">270000 Biological Sciences &gt; 270400 Botany</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">2611</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">03 Dec 2007 14:35</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=2611;">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&amp;eprintid=2611">item control page</a></p>
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