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<title>UTas ePrints - Water loss physiology and the evolution within the Tasmanian conifer genus Athrotaxis (Cupressaceae)</title>
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<meta content="Jordan, Gregory J." name="eprints.creators_name" />
<meta content="Brodribb, Tim J." name="eprints.creators_name" />
<meta content="Loney, Prue E." name="eprints.creators_name" />
<meta content="greg.jordan@utas.edu.au" name="eprints.creators_id" />
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<meta content="Water loss physiology and the evolution within the Tasmanian conifer genus Athrotaxis (Cupressaceae)" name="eprints.title" />
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<meta content="The Tasmanian montane and rainforest conifer genus, Athrotaxis, provides a system for investigating the relationship between leaf form and function and its adaptive significance. The two species differ markedly in leaf size, degree of imbricacy and stomatal distribution. Hybrid swarms in the field and glasshouse grown hybrid progeny are highly variable for these traits. In glasshouse grown plants of the true species and a diverse hybrid progeny, stomatal conductivity and density varied by about 200% among individuals with a strong correlation between these traits. Hybrids were found to produce lower stomatal densities and less discrimination of 13C than either species, leading to a negative relationship between stomatal density and delta 13C. In contrast to the highly variable stomatal densities and delta 13C in glasshouse plants, field plants were very conservative in both characters. Relatively low stomatal density and high water use efficiency in field plants suggests strong natural selection to optimize the trade-off between assimilation and water loss. Foliar conductance in the light for the hybrids and A. selaginoides was only 4-6 times as great as, and was strongly correlated with, conductance in the dark. This suggests either incomplete stomatal closure or greater cuticular conductance. In contrast, A. cupressoides appeared to be less "leaky", which may reflect adaptation to its more exposed habitat." name="eprints.abstract" />
<meta content="2004-12" name="eprints.date" />
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<meta content="Australian Journal of Botany" name="eprints.publication" />
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<meta content="765-771" name="eprints.pagerange" />
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<meta content="Bresnehan SJ (1993) A palaeobotanical analysis of a relict lacustrine deposit, upper Mersey Valley, North Central Tasmania. BSc (Hons) Thesis, The University of Newcastle, Australia.
Brodribb TJ (1997) Southern Hemisphere conifers: distribution and history explained from a physiological perspective. PhD Thesis, University of Tasmania, Australia.
Brodribb TJ, Hill RS (1997a) Imbricacy and stomatal wax plugs reduce maximum leaf conductance in Southern Hemisphere conifers. Australian Journal of Botany 45, 657-668.
Brodribb TJ, Hill RS (1997b) The light response characteristics of morphologically diverse group of southern hemisphere conifers. Oecologia 110, 10-17.
Brodribb TJ, Hill RS (2000) Increases in water potential gradient reduce xylem conductivity in whole plants. Evidence from a low-pressure conductivity method. Plant Physiology 123, 1021-1027
Colhoun EA, Benger SN, Fitzsimons SJ, Van De Geer G, Hill RS (1993) Quaternary organic deposit from Newton Creek Valley, western Tasmania. Australian Geographical Studies 31, 26-38.
Cullen PJ, Kirkpatrick JB (1988) The ecology of Athrotaxis D. Don (Taxodiaceae). II. The distribution and ecological differentiation of A. cupressoides and A. selaginoides. Australian Journal of Botany 36, 561-573.
Fitzsimons SJ, Colhoun EA, van der Geer G, Hill RS (1990) Definition and character of the Regency Interglacial and Early-Middle Pleistocene stratigraphy in the King Valley, western Tasmania, Australia. Boreas 19, 1-15.
Gadek PA, Alpers DL, Heslewood MM, Quinn CJ (2000) Relationships within Cupressaceae sensu lato: A combined morphological and molecular approach. American Journal of Botany 87, 1044–1057.
Hill KD (1998) Pinophyta. Flora of Australia 48, 545-596.
Hill RS, Brodribb T (1999) Southern conifers in time and space. Australian Journal of Botany 47, 639-696.
Hill RS, Jordan GJ, Carpenter RJ (1993) Taxodiaceous macrofossils from Tertiary and Quaternary sediments in Tasmania. Australian Systematic Botany 6, 237-49.
Isoda K, Brodribb TJ, Shiraishi S (2000) Hybrid origin of Athrotaxis laxifolia (Taxodiaceae) confirmed by RAPD (random amplified polymorphic DNA) analysis. Australian Journal of Botany 48, 753-758.
Jordan GJ, Macphail MK, Barnes R, Hill RS (1995) An Early-Middle Pleistocene flora of subalpine affinities in lowland western Tasmania. Australian Journal of Botany 43, 231-242.
Kirkpatrick JB (1997) 'Alpine Tasmania: an illustrated guide to the flora and vegetation.’ (Oxford University Press: Melbourne)
Loney PE (2001) Evidence for selection in Athrotaxis. BSc (Hons) Thesis, University of Tasmania, Australia.
Medlock K (1979) Chemotaxonomy of leaf oil terpenes of some Tasmanian pines. BSc (Hons) Thesis, University of Tasmania, Australia.
Read J (1999) Rainforest ecology. In 'Vegetation of Tasmania'. (Eds JB Reid, RS Hill, MJ Brown, MJ Hovenden) pp. 160 - 197. (Australian Biological Resource Study: Melbourne)
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<meta content="Jordan, Gregory J. and Brodribb, Tim J. and Loney, Prue E. (2004) Water loss physiology and the evolution within the Tasmanian conifer genus Athrotaxis (Cupressaceae). Australian Journal of Botany, 52 (6). pp. 765-771." name="eprints.citation" />
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<meta content="Loney, Prue E." name="DC.creator" />
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<meta content="The Tasmanian montane and rainforest conifer genus, Athrotaxis, provides a system for investigating the relationship between leaf form and function and its adaptive significance. The two species differ markedly in leaf size, degree of imbricacy and stomatal distribution. Hybrid swarms in the field and glasshouse grown hybrid progeny are highly variable for these traits. In glasshouse grown plants of the true species and a diverse hybrid progeny, stomatal conductivity and density varied by about 200% among individuals with a strong correlation between these traits. Hybrids were found to produce lower stomatal densities and less discrimination of 13C than either species, leading to a negative relationship between stomatal density and delta 13C. In contrast to the highly variable stomatal densities and delta 13C in glasshouse plants, field plants were very conservative in both characters. Relatively low stomatal density and high water use efficiency in field plants suggests strong natural selection to optimize the trade-off between assimilation and water loss. Foliar conductance in the light for the hybrids and A. selaginoides was only 4-6 times as great as, and was strongly correlated with, conductance in the dark. This suggests either incomplete stomatal closure or greater cuticular conductance. In contrast, A. cupressoides appeared to be less "leaky", which may reflect adaptation to its more exposed habitat." name="DC.description" />
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<h1 class="ep_tm_pagetitle">Water loss physiology and the evolution within the Tasmanian conifer genus Athrotaxis (Cupressaceae)</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Jordan, Gregory J.</span> and <span class="person_name">Brodribb, Tim J.</span> and <span class="person_name">Loney, Prue E.</span> (2004) <xhtml:em>Water loss physiology and the evolution within the Tasmanian conifer genus Athrotaxis (Cupressaceae).</xhtml:em> Australian Journal of Botany, 52 (6). pp. 765-771.</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/1717/1/athro_water_loss.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/1717/1/athro_water_loss.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />327Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input value="2213" 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/10.1071/BT04029">http://dx.doi.org/10.1071/BT04029</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">The Tasmanian montane and rainforest conifer genus, Athrotaxis, provides a system for investigating the relationship between leaf form and function and its adaptive significance. The two species differ markedly in leaf size, degree of imbricacy and stomatal distribution. Hybrid swarms in the field and glasshouse grown hybrid progeny are highly variable for these traits. In glasshouse grown plants of the true species and a diverse hybrid progeny, stomatal conductivity and density varied by about 200% among individuals with a strong correlation between these traits. Hybrids were found to produce lower stomatal densities and less discrimination of 13C than either species, leading to a negative relationship between stomatal density and delta 13C. In contrast to the highly variable stomatal densities and delta 13C in glasshouse plants, field plants were very conservative in both characters. Relatively low stomatal density and high water use efficiency in field plants suggests strong natural selection to optimize the trade-off between assimilation and water loss. Foliar conductance in the light for the hybrids and A. selaginoides was only 4-6 times as great as, and was strongly correlated with, conductance in the dark. This suggests either incomplete stomatal closure or greater cuticular conductance. In contrast, A. cupressoides appeared to be less "leaky", which may reflect adaptation to its more exposed habitat.</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">Definitive version is available online at http://www.publish.csiro/journals/ajb</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/270799.html">270000 Biological Sciences > 270700 Ecology and Evolution > 270799 Ecology and Evolution not elsewhere classified</a><br /><a href="http://eprints.utas.edu.au/view/subjects/270402.html">270000 Biological Sciences > 270400 Botany > 270402 Plant Physiology</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">1717</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">dr gregory j jordan</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">30 Aug 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">11 Feb 2008 11:17</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=1717;">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=1717">item control page</a></p>
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