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<title>UTas ePrints - Forced depression of leaf hydraulic conductance in situ : effects on the leaf gas exchange of forest trees</title>
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<meta content="Forced depression of leaf hydraulic conductance
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effects on the leaf gas exchange of forest trees" name="eprints.title" />
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<meta content="1. Recent work on the hydraulic conductance of leaves suggests that maximum photosynthetic performance of a leaf is defined largely by its plumbing. Pursuing this idea, we tested how the diurnal course of gas exchange of trees in a dry tropical forest was affected by artificially depressing the hydraulic conductance of leaves (Kleaf).
2. Individual leaves from four tropical tree species were exposed to a brief episode of forced evaporation by blowing warm air over leaves in situ. Despite humid soil and atmospheric conditions, this caused leaf water potential (Ψleaf) to fall sufficiently to induce a 50–74% drop in Kleaf.
3. Two of the species sampled proved highly sensitive to artificially depressed Kleaf, leading to a marked and sustained decline in the instantaneous rate of CO2 uptake, stomatal conductance and transpiration. Leaves of these species showed a depression of hydraulic and photosynthetic capacity in response to the ‘blow-dry’ treatment similar to that observed when major veins in the leaf were severed.
4. By contrast, the other two species sampled were relatively insensitive to Kleaf manipulation; photosynthetic rates were indistinguishable from control (untreated) leaves 4 h after treatment. These insensitive species demonstrate a linear decline of Kleaf with Ψleaf, while Kleaf in the two sensitive species falls precipitously at a critical water deficit.
5. We propose that a sigmoidal Kleaf vulnerability enables a high diurnal yield of CO2 at the cost of exposing leaves to the possibility of xylem cavitation. Linear Kleaf vulnerability leads to a relatively lower CO2 yield, while providing better protection against cavitation.
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<meta content="Consistency between an allometric approach and optimal partitioning theory in global patterns of plant biomass allocation
M. C. MCCARTHY and B. J. ENQUIST
Functional Ecology, Volume 21, Issue 4, Page 713-720, Aug 2007, doi: 10.1111/j.1365-2435.2007.01276.x
Leaf hydraulic conductivity and stomatal responses to humidity in amphistomatous leaves
KEITH A. MOTT
Plant, Cell & Environment, Volume 30, Issue 11, Page 1444-1449, Nov 2007, doi: 10.1111/j.1365-3040.2007.01720.x
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DAVID R. WOODRUFF, KATHERINE A. MCCULLOH, JEFFREY M. WARREN, FREDERICK C. MEINZER & BARBARA LACHENBRUCH
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ALISON M. SMITH & MARK STITT
Plant, Cell & Environment, Volume 30, Issue 9, Special Issue on Photosynthesis, Page 1126-1149, Sep 2007, doi: 10.1111/j.1365-3040.2007.01708.x
Biodiversity and ecosystem functioning: reconciling the results of experimental and observational studies
A. HECTOR, J. JOSHI, M. SCHERER-LORENZEN, B. SCHMID, E. M. SPEHN, L. WACKER, M. WEILENMANN, E. BAZELEY-WHITE, C. BEIERKUHNLEIN, M. C. CALDEIRA, P. G. DIMITRAKOPOULOS, J. A. FINN, K. HUSS-DANELL, A. JUMPPONEN, P. W. LEADLEY, M. LOREAU, C. P. H. MULDER, C. NEßHÖVER, C. PALMBORG, D. J. READ, A. S. D. SIAMANTZIOURAS, A. C. TERRY and A. Y. TROUMBIS
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<meta content="1. Recent work on the hydraulic conductance of leaves suggests that maximum photosynthetic performance of a leaf is defined largely by its plumbing. Pursuing this idea, we tested how the diurnal course of gas exchange of trees in a dry tropical forest was affected by artificially depressing the hydraulic conductance of leaves (Kleaf).
2. Individual leaves from four tropical tree species were exposed to a brief episode of forced evaporation by blowing warm air over leaves in situ. Despite humid soil and atmospheric conditions, this caused leaf water potential (Ψleaf) to fall sufficiently to induce a 50–74% drop in Kleaf.
3. Two of the species sampled proved highly sensitive to artificially depressed Kleaf, leading to a marked and sustained decline in the instantaneous rate of CO2 uptake, stomatal conductance and transpiration. Leaves of these species showed a depression of hydraulic and photosynthetic capacity in response to the ‘blow-dry’ treatment similar to that observed when major veins in the leaf were severed.
4. By contrast, the other two species sampled were relatively insensitive to Kleaf manipulation; photosynthetic rates were indistinguishable from control (untreated) leaves 4 h after treatment. These insensitive species demonstrate a linear decline of Kleaf with Ψleaf, while Kleaf in the two sensitive species falls precipitously at a critical water deficit.
5. We propose that a sigmoidal Kleaf vulnerability enables a high diurnal yield of CO2 at the cost of exposing leaves to the possibility of xylem cavitation. Linear Kleaf vulnerability leads to a relatively lower CO2 yield, while providing better protection against cavitation.
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<h1 class="ep_tm_pagetitle">Forced depression of leaf hydraulic conductance in situ : effects on the leaf gas exchange of forest trees</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Brodribb, Tim J.</span> (2007) <xhtml:em>Forced depression of leaf hydraulic conductance in situ : effects on the leaf gas exchange of forest trees.</xhtml:em> Functional Ecology, 21 (4). pp. 705-712. ISSN 0269-8463</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/2579/1/Fun__Ecol__Forced__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/2579/1/Fun__Ecol__Forced__depression.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />185Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="3387" 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.1365-2435.2007.01271.x">http://dx.doi.org/10.1111/j.1365-2435.2007.01271.x</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">1. Recent work on the hydraulic conductance of leaves suggests that maximum photosynthetic performance of a leaf is defined largely by its plumbing. Pursuing this idea, we tested how the diurnal course of gas exchange of trees in a dry tropical forest was affected by artificially depressing the hydraulic conductance of leaves (Kleaf).
2. Individual leaves from four tropical tree species were exposed to a brief episode of forced evaporation by blowing warm air over leaves in situ. Despite humid soil and atmospheric conditions, this caused leaf water potential (Ψleaf) to fall sufficiently to induce a 50–74% drop in Kleaf.
3. Two of the species sampled proved highly sensitive to artificially depressed Kleaf, leading to a marked and sustained decline in the instantaneous rate of CO2 uptake, stomatal conductance and transpiration. Leaves of these species showed a depression of hydraulic and photosynthetic capacity in response to the ‘blow-dry’ treatment similar to that observed when major veins in the leaf were severed.
4. By contrast, the other two species sampled were relatively insensitive to Kleaf manipulation; photosynthetic rates were indistinguishable from control (untreated) leaves 4 h after treatment. These insensitive species demonstrate a linear decline of Kleaf with Ψleaf, while Kleaf in the two sensitive species falls precipitously at a critical water deficit.
5. We propose that a sigmoidal Kleaf vulnerability enables a high diurnal yield of CO2 at the cost of exposing leaves to the possibility of xylem cavitation. Linear Kleaf vulnerability leads to a relatively lower CO2 yield, while providing better protection against cavitation.
</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">dry tropics, leaf hydraulics, photosynthetic depression, cavitation, diurnal, assimilation</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">2579</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 11:19</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=2579;">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=2579">item control page</a></p>
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