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<title>UTas ePrints - Diurnal depression of leaf hydraulic conductance in a tropical tree species</title>
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<meta content="Brodribb, Tim J." name="eprints.creators_name" />
<meta content="Holbrook, N. M." name="eprints.creators_name" />
<meta content="Timothy.Brodribb@utas.edu.au" name="eprints.creators_id" />
<meta content="" name="eprints.creators_id" />
<meta content="article" name="eprints.type" />
<meta content="2007-11-30 02:06:50" name="eprints.datestamp" />
<meta content="2008-01-08 15:30:00" name="eprints.lastmod" />
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<meta content="Diurnal depression of leaf hydraulic conductance in a
tropical tree species" name="eprints.title" />
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<meta content="270402" name="eprints.subjects" />
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<meta content="gas exchange; leaf hydraulic conductance; midday
depression; stomata; water use." name="eprints.keywords" />
<meta content=""The definitive version is available at www.blackwell-synergy.com"
" name="eprints.note" />
<meta content="Diurnal patterns of hydraulic conductance of the leaf lamina
(
K
leaf
) were monitored in a field-grown tropical tree
species in an attempt to ascertain whether the dynamics of
stomatal conductance (
g
s
) and CO
2
uptake (
A
leaf
) were
associated with short-term changes in
K
leaf
. On days of high
evaporative demand mid-day depression of
K
leaf
to between
40 and 50% of pre-dawn values was followed by a rapid
recovery after 1500 h. Leaf water potential during the
recovery stage was less than
-
1 MPa implying a refilling
mechanism, or that loss of
K
leaf
was not linked to cavitation.
Laboratory measurement of the response of
K
leaf
to
Y
leaf
confirmed that leaves in the field were operating at water
potentials within the depressed region of the leaf ‘vulnerability
curve’. Diurnal courses of
K
leaf
and
Y
leaf
predicted
from measured transpiration, xylem water potential and
the
K
leaf
vulnerability function, yielded good agreement
with observed trends in both leaf parameters. Close correlation
between depression of
K
leaf
,
g
s
and
A
leaf
suggests that
xylem dysfunction in the leaf may lead to mid-day depression
of gas exchange in this species." name="eprints.abstract" />
<meta content="2004" name="eprints.date" />
<meta content="published" name="eprints.date_type" />
<meta content="Plant, Cell and Environment" name="eprints.publication" />
<meta content="27" name="eprints.volume" />
<meta content="7" name="eprints.number" />
<meta content="820-827" name="eprints.pagerange" />
<meta content="10.1111/j.1365-3040.2004.01188.x" name="eprints.id_number" />
<meta content="TRUE" name="eprints.refereed" />
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<meta content="http://dx.doi.org/10.1111/j.1365-3040.2004.01188.x" name="eprints.official_url" />
<meta content="Brodribb T.J. & Feild T.S. (2000) Stem hydraulic supply is linked
to leaf photosynthetic capacity: evidence from New Caledonian
and Tasmanian rainforests. Plant, Cell and Environment 23,
1381–1388.
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in the distribution of conifer species. New Phytologist
143, 365–372.
Brodribb T.J. & Holbrook N.M. (2003a) Stomatal closure during
leaf dehydration, correlation with other leaf physiological traits.
Plant Physiology 132, 2166–2173.
Brodribb T.J. & Holbrook N.M. (2003b) Changes in leaf hydraulic
conductance during leaf shedding in seasonally dry tropical forest.
New Phytologist 158, 295–303.
Brodribb T.J., Holbrook N.M., Edwards E.J. & Gutiérrez M.V.
(2003) Relations between stomatal closure, leaf turgor and
xylem vulnerability in eight tropical dry forest trees. Plant, Cell
and Environment 26, 443–450.
Brodribb T.J., Holbrook N.M. & Gutiérrez M.V. (2002) Hydraulic
and photosynthetic co-ordination in seasonally dry tropical forest
trees. Plant, Cell and Environment 25, 1435–1444.
Bucci S.J., Scholtz F.G., Goldstein G., Meinzer F.C. & Sternberg
L. (2003) Dynamic changes in hydraulic conductivity in petioles
of two savanna tree species: factors and mechanisms contributing
to the refilling of embolized vessels. Plant, Cell and Environment
26, 1633–1645.
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and biochemical model of stomatal conductance. Plant,
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Botany 88, 47–51.
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the effects of plant hydraulics on stomatal closure during water
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Sarg.). Plant, Cell and Environment 21, 1173–1180.
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(2000) Dynamic changes in petiole specific conductivity in red
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and northern fox grape (Vitis labrusca L.). Plant, Cell and Environment
23, 407–414." name="eprints.referencetext" />
<meta content="Brodribb, Tim J. and Holbrook, N. M. (2004) Diurnal depression of leaf hydraulic conductance in a tropical tree species. Plant, Cell and Environment, 27 (7). pp. 820-827. ISSN 0140-7791" name="eprints.citation" />
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<meta content="Diurnal depression of leaf hydraulic conductance in a
tropical tree species" name="DC.title" />
<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="Diurnal patterns of hydraulic conductance of the leaf lamina
(
K
leaf
) were monitored in a field-grown tropical tree
species in an attempt to ascertain whether the dynamics of
stomatal conductance (
g
s
) and CO
2
uptake (
A
leaf
) were
associated with short-term changes in
K
leaf
. On days of high
evaporative demand mid-day depression of
K
leaf
to between
40 and 50% of pre-dawn values was followed by a rapid
recovery after 1500 h. Leaf water potential during the
recovery stage was less than
-
1 MPa implying a refilling
mechanism, or that loss of
K
leaf
was not linked to cavitation.
Laboratory measurement of the response of
K
leaf
to
Y
leaf
confirmed that leaves in the field were operating at water
potentials within the depressed region of the leaf ‘vulnerability
curve’. Diurnal courses of
K
leaf
and
Y
leaf
predicted
from measured transpiration, xylem water potential and
the
K
leaf
vulnerability function, yielded good agreement
with observed trends in both leaf parameters. Close correlation
between depression of
K
leaf
,
g
s
and
A
leaf
suggests that
xylem dysfunction in the leaf may lead to mid-day depression
of gas exchange in this species." name="DC.description" />
<meta content="2004" name="DC.date" />
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<h1 class="ep_tm_pagetitle">Diurnal depression of leaf hydraulic conductance in a tropical tree species</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Brodribb, Tim J.</span> and <span class="person_name">Holbrook, N. M.</span> (2004) <xhtml:em>Diurnal depression of leaf hydraulic conductance in a tropical tree species.</xhtml:em> Plant, Cell and Environment, 27 (7). pp. 820-827. 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/2596/1/diurnal_depression.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/2596/1/diurnal_depression.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />310Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="3404" 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.1365-3040.2004.01188.x">http://dx.doi.org/10.1111/j.1365-3040.2004.01188.x</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Diurnal patterns of hydraulic conductance of the leaf lamina
(
K
leaf
) were monitored in a field-grown tropical tree
species in an attempt to ascertain whether the dynamics of
stomatal conductance (
g
s
) and CO
2
uptake (
A
leaf
) were
associated with short-term changes in
K
leaf
. On days of high
evaporative demand mid-day depression of
K
leaf
to between
40 and 50% of pre-dawn values was followed by a rapid
recovery after 1500 h. Leaf water potential during the
recovery stage was less than
-
1 MPa implying a refilling
mechanism, or that loss of
K
leaf
was not linked to cavitation.
Laboratory measurement of the response of
K
leaf
to
Y
leaf
confirmed that leaves in the field were operating at water
potentials within the depressed region of the leaf ‘vulnerability
curve’. Diurnal courses of
K
leaf
and
Y
leaf
predicted
from measured transpiration, xylem water potential and
the
K
leaf
vulnerability function, yielded good agreement
with observed trends in both leaf parameters. Close correlation
between depression of
K
leaf
,
g
s
and
A
leaf
suggests that
xylem dysfunction in the leaf may lead to mid-day depression
of gas exchange in this species.</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">gas exchange; leaf hydraulic conductance; midday
depression; stomata; water use.</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">2596</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">30 Nov 2007 13:06</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=2596;">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=2596">item control page</a></p>
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