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<meta content="Zwieniecki, Maciej A." name="eprints.creators_name" />
<meta content="Brodribb, Tim J." name="eprints.creators_name" />
<meta content="Holbrook, N. M." name="eprints.creators_name" />
<meta content="" name="eprints.creators_id" />
<meta content="Timothy.Brodribb@utas.edu.au" name="eprints.creators_id" />
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<meta content="2007-11-29 00:35:55" name="eprints.datestamp" />
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<meta content="Hydraulic design of leaves: insights from
rehydration kinetics" name="eprints.title" />
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<meta content="270402" name="eprints.subjects" />
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<meta content="venation pattern; bundle sheath extension; transpiration
stream; hydraulic compartmentalization." name="eprints.keywords" />
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<meta content="We examined the leaf hydraulic design in 10 species based on
their rehydration kinetics. In all cases, a biphasic response
described the temporal pattern of water uptake, with time
constants of ~30 to 800 s and ~800 to 8000 s. The time constants
of the fast phase were significantly shorter in the six
angiosperms (30 to 110 s) compared with the two singleveined
conifer species (>400 s) examined, while the two
multi-veined gymnosperm species, Gnetum gnemon and
Ginkgo biloba, had time constants for the fast phase of
~150 s. Among angiosperm species, the fast phase constituted
50–90% of the total water absorbed, whereas in gymnosperms
70–90% of the water uptake could be assigned to
the slow phase. In the four gymnosperms, the relative water
uptake corresponding to the fast phase matched to a good
degree the relative volume of the venation and bundle
sheath extension; whereas in the angiosperm species, the
relatively larger water influx during the fast phase was
similar in relative volume to the combined venation, bundle
sheath extension, epidermis and (in four species) the spongy
mesophyll. This suggests a general trend from a design in
which the epidermis is weakly connected to the veins (all
four gymnosperms), to a design with good hydraulic connection
between epidermis and veins that largely bypasses the
mesophyll (four of six angiosperms), to a design in which
almost the entire leaf appears to function as a single pool." name="eprints.abstract" />
<meta content="2007" name="eprints.date" />
<meta content="Plant, Cell and Environment" name="eprints.publication" />
<meta content="30" name="eprints.volume" />
<meta content="8" name="eprints.number" />
<meta content="910-921" name="eprints.pagerange" />
<meta content="10.1111/j.1365-3040.2007.001681.x" name="eprints.id_number" />
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<meta content="Berkowitz G.A. & Kroll K.S. (1988) Acclimation of photosynthesis
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N.M. (2002) The hydraulic architecture of the leaf venation in
Laurus nobilis L. Plant, Cell & Environment 25, 1445–1450.
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limitations imposed by crown placement determine final size and
shape of Quercus rubra L. leaves. Plant, Cell & Environment 27,
357–365." name="eprints.referencetext" />
<meta content="Zwieniecki, Maciej A. and Brodribb, Tim J. and Holbrook, N. M. (2007) Hydraulic design of leaves: insights from rehydration kinetics. Plant, Cell and Environment, 30 (8). pp. 910-921. ISSN 0140-7791" name="eprints.citation" />
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<meta content="Hydraulic design of leaves: insights from
rehydration kinetics" name="DC.title" />
<meta content="Zwieniecki, Maciej A." name="DC.creator" />
<meta content="Brodribb, Tim J." name="DC.creator" />
<meta content="Holbrook, N. M." name="DC.creator" />
<meta content="270402 Plant Physiology" name="DC.subject" />
<meta content="270400 Botany" name="DC.subject" />
<meta content="We examined the leaf hydraulic design in 10 species based on
their rehydration kinetics. In all cases, a biphasic response
described the temporal pattern of water uptake, with time
constants of ~30 to 800 s and ~800 to 8000 s. The time constants
of the fast phase were significantly shorter in the six
angiosperms (30 to 110 s) compared with the two singleveined
conifer species (>400 s) examined, while the two
multi-veined gymnosperm species, Gnetum gnemon and
Ginkgo biloba, had time constants for the fast phase of
~150 s. Among angiosperm species, the fast phase constituted
50–90% of the total water absorbed, whereas in gymnosperms
70–90% of the water uptake could be assigned to
the slow phase. In the four gymnosperms, the relative water
uptake corresponding to the fast phase matched to a good
degree the relative volume of the venation and bundle
sheath extension; whereas in the angiosperm species, the
relatively larger water influx during the fast phase was
similar in relative volume to the combined venation, bundle
sheath extension, epidermis and (in four species) the spongy
mesophyll. This suggests a general trend from a design in
which the epidermis is weakly connected to the veins (all
four gymnosperms), to a design with good hydraulic connection
between epidermis and veins that largely bypasses the
mesophyll (four of six angiosperms), to a design in which
almost the entire leaf appears to function as a single pool." name="DC.description" />
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<h1 class="ep_tm_pagetitle">Hydraulic design of leaves: insights from rehydration kinetics</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Zwieniecki, Maciej A.</span> and <span class="person_name">Brodribb, Tim J.</span> and <span class="person_name">Holbrook, N. M.</span> (2007) <xhtml:em>Hydraulic design of leaves: insights from rehydration kinetics.</xhtml:em> Plant, Cell and Environment, 30 (8). pp. 910-921. 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/2580/1/Zweiniecki_Brod.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/2580/1/Zweiniecki_Brod.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />764Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="3388" 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/10.1111/j.1365-3040.2007.001681.x">http://dx.doi.org/10.1111/j.1365-3040.2007.001681.x</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">We examined the leaf hydraulic design in 10 species based on
their rehydration kinetics. In all cases, a biphasic response
described the temporal pattern of water uptake, with time
constants of ~30 to 800 s and ~800 to 8000 s. The time constants
of the fast phase were significantly shorter in the six
angiosperms (30 to 110 s) compared with the two singleveined
conifer species (>400 s) examined, while the two
multi-veined gymnosperm species, Gnetum gnemon and
Ginkgo biloba, had time constants for the fast phase of
~150 s. Among angiosperm species, the fast phase constituted
50–90% of the total water absorbed, whereas in gymnosperms
70–90% of the water uptake could be assigned to
the slow phase. In the four gymnosperms, the relative water
uptake corresponding to the fast phase matched to a good
degree the relative volume of the venation and bundle
sheath extension; whereas in the angiosperm species, the
relatively larger water influx during the fast phase was
similar in relative volume to the combined venation, bundle
sheath extension, epidermis and (in four species) the spongy
mesophyll. This suggests a general trend from a design in
which the epidermis is weakly connected to the veins (all
four gymnosperms), to a design with good hydraulic connection
between epidermis and veins that largely bypasses the
mesophyll (four of six angiosperms), to a design in which
almost the entire leaf appears to function as a single pool.</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 at www.blackwell-synergy.com"
</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">venation pattern; bundle sheath extension; transpiration
stream; hydraulic compartmentalization.</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">2580</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 11:35</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=2580;">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=2580">item control page</a></p>
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