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    <title>UTas ePrints - A unique mode of parasitism in the conifer coral tree Parasitaxus ustus (Podocarpaceae)</title>
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    <meta content="Feild, Taylor S." name="eprints.creators_name" />
<meta content="Brodribb, Tim J." name="eprints.creators_name" />
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Parasitaxus ustus
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; carbon isotopic;
holoparasitic; mistletoe; mycoheterotroph; parasitic plants" name="eprints.keywords" />
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<meta content="Almost all parasitic plants, including more than 3000 species,
are angiosperms. The only suggested gymnosperm
exception is the New Caledonian conifer,
Parasitaxus
ustus
, which forms a bizarre graft-like attachment to the
roots of another conifer
Falcatifolium taxoides
. Yet, the
degree of resource dependence of
Parasitaxus
on
Falcatifolium
has remained speculative. Here we show that
Parasitaxus
is definitively parasitic, but it displays a physiological
habit unlike any known angiosperm parasite.
Despite possessing chloroplasts, it was found that the
burgundy red shoots of
Parasitaxus
lack significant photosynthetic
electron transport. However unlike nonphotosynthetic
angiosperm parasites (holoparasites),
tissues of
Parasitaxus
are considerably enriched in
13
carbon
relative to its host. In line with anatomical observations of
fungal hyphae embedded in the parasite/host union, stable
carbon isotopic measurements indicate that carbon transport
from the host to
Parasitaxus
most likely involves a
fungal partner. Therefore,
Parasitaxus
parallels fungusfeeding
angiosperms (mycoheterotrophs) that steal carbon
from soil mycorrhizal fungi. Yet with its tree-like habit,
association with fungi residing within the host union, high
stomatal conductance, and low water potential, it is demonstrated
that
Parasitaxus
functions unlike any known
angiosperm mycoheterotroph or holoparasite.
Parasitaxus
appears to present a unique physiological chimera of mistletoe-
like water relations and fungal-mediated carbon trafficking
from the host." name="eprints.abstract" />
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<meta content="Adams W.W. III, Zarter C.R., Ebbert V. &amp; Demmig-Adams B.
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731–746." name="eprints.referencetext" />
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<meta content="Almost all parasitic plants, including more than 3000 species,
are angiosperms. The only suggested gymnosperm
exception is the New Caledonian conifer,
Parasitaxus
ustus
, which forms a bizarre graft-like attachment to the
roots of another conifer
Falcatifolium taxoides
. Yet, the
degree of resource dependence of
Parasitaxus
on
Falcatifolium
has remained speculative. Here we show that
Parasitaxus
is definitively parasitic, but it displays a physiological
habit unlike any known angiosperm parasite.
Despite possessing chloroplasts, it was found that the
burgundy red shoots of
Parasitaxus
lack significant photosynthetic
electron transport. However unlike nonphotosynthetic
angiosperm parasites (holoparasites),
tissues of
Parasitaxus
are considerably enriched in
13
carbon
relative to its host. In line with anatomical observations of
fungal hyphae embedded in the parasite/host union, stable
carbon isotopic measurements indicate that carbon transport
from the host to
Parasitaxus
most likely involves a
fungal partner. Therefore,
Parasitaxus
parallels fungusfeeding
angiosperms (mycoheterotrophs) that steal carbon
from soil mycorrhizal fungi. Yet with its tree-like habit,
association with fungi residing within the host union, high
stomatal conductance, and low water potential, it is demonstrated
that
Parasitaxus
functions unlike any known
angiosperm mycoheterotroph or holoparasite.
Parasitaxus
appears to present a unique physiological chimera of mistletoe-
like water relations and fungal-mediated carbon trafficking
from the host." name="DC.description" />
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    <h1 class="ep_tm_pagetitle">A unique mode of parasitism in the conifer coral tree Parasitaxus ustus (Podocarpaceae)</h1>
    <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> (2005) <xhtml:em>A unique mode of parasitism in the conifer coral tree Parasitaxus ustus (Podocarpaceae).</xhtml:em> Plant, Cell and Environment, 28 (10). pp. 1316-1325. ISSN 0140-7791</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/2585/1/Parasitaxus.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" border="0" class="ep_doc_icon" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/2585/1/Parasitaxus.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />458Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input value="3392" name="docid" accept-charset="utf-8" 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/10.1111/j.1365-3040.2005.01378.x">http://dx.doi.org/10.1111/j.1365-3040.2005.01378.x</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Almost all parasitic plants, including more than 3000 species,&#13;
are angiosperms. The only suggested gymnosperm&#13;
exception is the New Caledonian conifer,&#13;
Parasitaxus&#13;
ustus&#13;
, which forms a bizarre graft-like attachment to the&#13;
roots of another conifer&#13;
Falcatifolium taxoides&#13;
. Yet, the&#13;
degree of resource dependence of&#13;
Parasitaxus&#13;
on&#13;
Falcatifolium&#13;
has remained speculative. Here we show that&#13;
Parasitaxus&#13;
is definitively parasitic, but it displays a physiological&#13;
habit unlike any known angiosperm parasite.&#13;
Despite possessing chloroplasts, it was found that the&#13;
burgundy red shoots of&#13;
Parasitaxus&#13;
lack significant photosynthetic&#13;
electron transport. However unlike nonphotosynthetic&#13;
angiosperm parasites (holoparasites),&#13;
tissues of&#13;
Parasitaxus&#13;
are considerably enriched in&#13;
13&#13;
carbon&#13;
relative to its host. In line with anatomical observations of&#13;
fungal hyphae embedded in the parasite/host union, stable&#13;
carbon isotopic measurements indicate that carbon transport&#13;
from the host to&#13;
Parasitaxus&#13;
most likely involves a&#13;
fungal partner. Therefore,&#13;
Parasitaxus&#13;
parallels fungusfeeding&#13;
angiosperms (mycoheterotrophs) that steal carbon&#13;
from soil mycorrhizal fungi. Yet with its tree-like habit,&#13;
association with fungi residing within the host union, high&#13;
stomatal conductance, and low water potential, it is demonstrated&#13;
that&#13;
Parasitaxus&#13;
functions unlike any known&#13;
angiosperm mycoheterotroph or holoparasite.&#13;
Parasitaxus&#13;
appears to present a unique physiological chimera of mistletoe-&#13;
like water relations and fungal-mediated carbon trafficking&#13;
from the host.</p></div><table style="margin-bottom: 1em" border="0" cellpadding="3" class="not_ep_block"><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 at www.blackwell-synergy.com&#13;
</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">Parasitaxus ustus&#13;
; carbon isotopic;&#13;
holoparasitic; mistletoe; mycoheterotroph; parasitic plants</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">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">2585</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">29 Nov 2007 14:37</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">11 Feb 2008 11:12</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=2585;">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=2585">item control page</a></p>
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