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    <title>UTas ePrints - Leaf physiology does not predict leaf habit; examples from tropical dry forest</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" />
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<meta content="Embolism . Leaf hydraulic conductance .
Leaf water potential . Phenology . Tropical dry forest" name="eprints.keywords" />
<meta content="(The original publication is available at www.springerlink.com)" name="eprints.note" />
<meta content="Leaf structure and physiology are thought to be
closely linked to leaf longevity and leaf habit. Here we compare
the seasonal variation in leaf hydraulic conductance
(kleaf ) andwater potential of two evergreen tree species with
contrasting leaf life spans, and two species with similar
leaf longevity but contrasting leaf habit, one being deciduous
and the other evergreen. One of the evergreen species,
Simarouba glauca, produced relatively short-lived leaves
that maintained high hydraulic conductance year round by
periodic flushing. The other evergreen species, Quercus
oleoides, produced longer-lived leaves with lower kleaf and
as a result minimum leaf water potential was much lower
than in S. glauca (−2.8 MPa vs −1.6 MPa). Associated
with exposure to lower water potentials, Q. oleoides leaves
were harder, had a higher modulus of elasticity, and were
less vulnerable to cavitation than S. glauca leaves. Both
species operate at water potentials capable of inducing 20
(S. glauca) to 50% (Q. oleoides) loss of kleaf during the
dry season although no evidence of cumulative losses in
kleaf were observed in either species suggesting regular repair
of embolisms. Leaf longevity in the deciduous species
Rhedera trinervis is similar to that of S. glauca, although
maximum kleaf was lower. Furthermore, a decline in leaf
water potential at the onset of the dry season led to cumulative
losses in kleaf in R. trinervis that culminated in leaf
shedding." name="eprints.abstract" />
<meta content="2005" name="eprints.date" />
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<meta content="Trees -Structure and Function" name="eprints.publication" />
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<meta content="10.1007/s00468-004-0390-3" name="eprints.id_number" />
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<meta content="Borchert R (1994a) Soil and stem water storage determine phenology
and distribution of tropical dry forest trees. Ecology 75:1437–
1449
Borchert R (1994b) Water status and development of tropical trees
during drought. Trees 8:115–125
Brodribb TJ, Holbrook NM (2003a) Changes in leaf hydraulic conductance
during leaf shedding in seasonally dry tropical forest.
New Phytol 158:295–303
Brodribb TJ, Holbrook NM (2003b) Stomatal closure during leaf dehydration,
correlation with other leaf physiological traits. Plant
Physiol 132:2166–2173
Brodribb TJ, Holbrook NM (2004) Diurnal depression of leaf hydraulic
conductance in a tropical tree species. Plant Cell Environ
27:820–827
Brodribb TJ, Holbrook NM, Guti´errez MV (2002) Hydraulic and
photosynthetic co-ordination in seasonally dry tropical forest
trees. Plant Cell Environ 25:1435–1444
Cavender-Bares J (2000) Physiological and evolutionary ecology of
oaks: functional traits in relation to habitat, environmental stress,
and global change. PhD thesis. Harvard University, Cambridge,
Mass.
Daubenmire R (1972) Phenology and other characteristics of tropical
semi-deciduous forest in northeastern Costa Rica. J Ecol
60:147–170
Eamus D, Prior L (2001) Ecophysiology of trees of seasonally dry
tropics: comparisons among phenologies.Adv Ecol Res 32:113–
197
Enquist BJ, Leffler AJ (2001) Long-term tree ring chronologies from
sympatric tropical dry-forest trees: individualistic responses to
climatic variation. J Trop Ecol 17:41–60
Fredeen AL, Sage RF (1999) Temperature and humidity effects
on branchlet gas-exchange in white spruce, an explanation for
the increase in transpiration with branchlet temperature. Trees
14:161–168
Holbrook NM,Whitbeck JL,Mooney HA (1995) Drought responses
of neotropical dry forest trees. In: Bullock SH, Mooney HA,
Medina E (eds) Seasonally dry tropical forests. Cambridge University
Press, Cambridge, pp 243–276
Janzen DH (1983) Costa Rican natural history. University of Chicago
Press, Chicago, Ill.
Kolb K, Sperry J, Lamont B (1996) A method for measuring xylem
hydraulic conductance and embolism in entire root and shoot
systems. J Exp Bot 47:1805–1810
Nardini A (2001) Are sclerophylls and malacophylls hydraulically
different? Biol Plant 44:239–245
Nardini A, TyreeMT, Salleo S (2001) Xylem cavitation in the leaf of
Prunus laurocerasus L. and its impact on leaf hydraulics. Plant
Physiol 125:1700–1709
Nilsen ET, SharifiMR, Rundel PW, Forseth IN, Ehleringer JR (1990)
Water relations of stem succulent trees in north-central Baja
California. Oecologia 82:299–303
Olivares E, Medina E (1992) Water and nutrient relations of
woody perennials from tropical dry forests. J Veg Sci 3:383–
392
Opler PA, Frankie GW, Baker HG (1980) Comparative phenological
studies of treelet and shrub species in tropicalwet and dry forests
in the lowlands of Costa Rica. J Ecol 68:167–188
Reich PB (1995) Phenology of tropical forests: patterns, causes, and
consequences. Can J Bot 73:164–174
Reich PB, Borchert R (1984) Water stress and tree phenology in a
tropical dry forest in the lowlands of Costa Rica. J Ecol 72:61–
74
Sack L, Melcher PJ, Zwieniecki MA, Holbrook NM (2002) The
hydraulic conductance of the angiosperm leaf lamina: a comparison
of three measurement methods. J Exp Bot 53:2177–
2184
Salleo S, Lo Gullo MA, Raimondo F, Nardini A (2001) Vulnerability
to cavitation of leaf minor veins: any impact on leaf gas
exchange? Plant Cell Environ 24:851–859
Salleo S, Nardini A, Lo Gullo MA, Ghirardelli LA (2002) Changes
in stem and leaf hydraulics preceding leaf shedding in Castanea
sativa L. Biol Plant 45:227–234
Sobrado MA (1986) Aspects of tissue water relations and seasonal
changes of leaf water potential components of evergreen and
deciduous species coexisting in tropical dry forests. Oecologia
68:413–416
Sobrado MA (1997) Embolism vulnerability in drought-deciduous
and evergreen species of a tropical dry forest. Acta Oecologica
18:383–391
Tyree MT, Hammel HT (1972) The measurement of the turgor pressure
and the water relations of plants" name="eprints.referencetext" />
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<meta content="Brodribb, Tim J." name="DC.creator" />
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<meta content="Leaf structure and physiology are thought to be
closely linked to leaf longevity and leaf habit. Here we compare
the seasonal variation in leaf hydraulic conductance
(kleaf ) andwater potential of two evergreen tree species with
contrasting leaf life spans, and two species with similar
leaf longevity but contrasting leaf habit, one being deciduous
and the other evergreen. One of the evergreen species,
Simarouba glauca, produced relatively short-lived leaves
that maintained high hydraulic conductance year round by
periodic flushing. The other evergreen species, Quercus
oleoides, produced longer-lived leaves with lower kleaf and
as a result minimum leaf water potential was much lower
than in S. glauca (−2.8 MPa vs −1.6 MPa). Associated
with exposure to lower water potentials, Q. oleoides leaves
were harder, had a higher modulus of elasticity, and were
less vulnerable to cavitation than S. glauca leaves. Both
species operate at water potentials capable of inducing 20
(S. glauca) to 50% (Q. oleoides) loss of kleaf during the
dry season although no evidence of cumulative losses in
kleaf were observed in either species suggesting regular repair
of embolisms. Leaf longevity in the deciduous species
Rhedera trinervis is similar to that of S. glauca, although
maximum kleaf was lower. Furthermore, a decline in leaf
water potential at the onset of the dry season led to cumulative
losses in kleaf in R. trinervis that culminated in leaf
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    <h1 class="ep_tm_pagetitle">Leaf physiology does not predict leaf habit; examples from tropical dry forest</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> (2005) <xhtml:em>Leaf physiology does not predict leaf habit; examples from tropical dry forest.</xhtml:em> Trees -Structure and Function, 19 . pp. 290-295. ISSN 0931-1890</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/2594/1/trees_leaf_habit.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/2594/1/trees_leaf_habit.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />292Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="3400" 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/10.1007/s00468-004-0390-3">http://dx.doi.org/10.1007/s00468-004-0390-3</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Leaf structure and physiology are thought to be&#13;
closely linked to leaf longevity and leaf habit. Here we compare&#13;
the seasonal variation in leaf hydraulic conductance&#13;
(kleaf ) andwater potential of two evergreen tree species with&#13;
contrasting leaf life spans, and two species with similar&#13;
leaf longevity but contrasting leaf habit, one being deciduous&#13;
and the other evergreen. One of the evergreen species,&#13;
Simarouba glauca, produced relatively short-lived leaves&#13;
that maintained high hydraulic conductance year round by&#13;
periodic flushing. The other evergreen species, Quercus&#13;
oleoides, produced longer-lived leaves with lower kleaf and&#13;
as a result minimum leaf water potential was much lower&#13;
than in S. glauca (−2.8 MPa vs −1.6 MPa). Associated&#13;
with exposure to lower water potentials, Q. oleoides leaves&#13;
were harder, had a higher modulus of elasticity, and were&#13;
less vulnerable to cavitation than S. glauca leaves. Both&#13;
species operate at water potentials capable of inducing 20&#13;
(S. glauca) to 50% (Q. oleoides) loss of kleaf during the&#13;
dry season although no evidence of cumulative losses in&#13;
kleaf were observed in either species suggesting regular repair&#13;
of embolisms. Leaf longevity in the deciduous species&#13;
Rhedera trinervis is similar to that of S. glauca, although&#13;
maximum kleaf was lower. Furthermore, a decline in leaf&#13;
water potential at the onset of the dry season led to cumulative&#13;
losses in kleaf in R. trinervis that culminated in leaf&#13;
shedding.</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 original publication is available at www.springerlink.com)</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">Embolism . Leaf hydraulic conductance .&#13;
Leaf water potential . Phenology . Tropical dry forest</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">2594</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 08:39</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=2594;">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=2594">item control page</a></p>
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