nigel.stanger / Digital_Repository
Transfer to URL with SHA Find file
Newer
Older
Digital_Repository / Misc / Mass downloads / UTas / 2587.html
Nigel Stanger on 7 May 2013 28 KB - Imported Misc directory.
Raw Blame History 
  1. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  2. "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  3. <html>
  4.   <head>
  5.     <title>UTas ePrints - Water Stress Deforms Tracheids Peripheral to the Leaf Vein of a Tropical Conifer</title>
  6.     <script type="text/javascript" src="http://eprints.utas.edu.au/javascript/auto.js"><!-- padder --></script>
  7.     <style type="text/css" media="screen">@import url(http://eprints.utas.edu.au/style/auto.css);</style>
  8.     <style type="text/css" media="print">@import url(http://eprints.utas.edu.au/style/print.css);</style>
  9.     <link rel="icon" href="/images/eprints/favicon.ico" type="image/x-icon" />
  10.     <link rel="shortcut icon" href="/images/eprints/favicon.ico" type="image/x-icon" />
  11.     <link rel="Top" href="http://eprints.utas.edu.au/" />
  12.     <link rel="Search" href="http://eprints.utas.edu.au/cgi/search" />
  13.     <meta content="Brodribb, Tim J." name="eprints.creators_name" />
  14. <meta content="Holbrook, N. M." name="eprints.creators_name" />
  15. <meta content="Timothy.Brodribb@utas.edu.au" name="eprints.creators_id" />
  16. <meta content="" name="eprints.creators_id" />
  17. <meta content="article" name="eprints.type" />
  18. <meta content="2007-11-29 03:59:00" name="eprints.datestamp" />
  19. <meta content="2008-01-08 15:30:00" name="eprints.lastmod" />
  20. <meta content="show" name="eprints.metadata_visibility" />
  21. <meta content="Water Stress Deforms Tracheids Peripheral to the
  22. Leaf Vein of a Tropical Conifer" name="eprints.title" />
  23. <meta content="pub" name="eprints.ispublished" />
  24. <meta content="270402" name="eprints.subjects" />
  25. <meta content="270400" name="eprints.subjects" />
  26. <meta content="restricted" name="eprints.full_text_status" />
  27. <meta content="Just as a soggy paper straw is prone to yielding under the applied suction of a thirsty drinker, the xylem tracheids in leaves
  28. seem prone to collapse as water potential declines, impeding their function. Here we describe the collapse, under tension, of
  29. lignified cells peripheral to the leaf vein of a broad-leaved rainforest conifer, Podocarpus grayi de Laub. Leaves of Podocarpus
  30. are characterized by an array of cylindrical tracheids aligned perpendicular to the leaf vein, apparently involved in the
  31. distribution of water radially through the mesophyll. During leaf desiccation the majority of these tracheids collapsed from
  32. circular to flat over the water potential range 21.5 to 22.8 MPa. An increase in the percentage of tracheids collapsed during
  33. imposed water stress was mirrored by declining leaf hydraulic conductivity (Kleaf), implying a direct effect on water transport
  34. efficiency. Stomata responded to water stress by closing at 22.0 MPa when 45% of cells were collapsed and Kleaf had declined
  35. by 25%. This was still substantially before the initial indications of cavitation-induced loss of hydraulic conductance in the leaf
  36. vein, at 23 MPa. Plants droughted until 49% of tracheids had collapsed were found to fully recover tracheid shape and leaf
  37. function 1 week after rewatering. A simple mechanical model of tracheid collapse, derived from the theoretical buckling
  38. pressure for pipes, accurately predicted the collapse dynamics observed in P. grayi, substantiating estimates of cell wall
  39. elasticity and measured leaf water potential. The possible adaptive advantages of collapsible vascular tissue are discussed." name="eprints.abstract" />
  40. <meta content="2005" name="eprints.date" />
  41. <meta content="published" name="eprints.date_type" />
  42. <meta content="Plant Physiology" name="eprints.publication" />
  43. <meta content="137" name="eprints.volume" />
  44. <meta content="1139-1146" name="eprints.pagerange" />
  45. <meta content="10.1104/pp.104.058156." name="eprints.id_number" />
  46. <meta content="TRUE" name="eprints.refereed" />
  47. <meta content="0032-0889" name="eprints.issn" />
  48. <meta content="http://dx.doi.org/10.1104/pp.104.058156" name="eprints.official_url" />
  49. <meta content="Bergander A, Salme´n L (2002) Cell wall properties and their effects on the
  50. mechanical properties of fibers. J Mater Sci 37: 151–156
  51. Brodribb TJ, Hill RS (1999) The importance of xylem constraints in the
  52. distribution of conifer species. New Phytol 143: 365–372
  53. Brodribb TJ, Holbrook NM (2003) Stomatal closure during leaf dehydra-
  54. tion: correlation with other leaf physiological traits. Plant Physiol 132:
  55. 2166–2173
  56. Brodribb TJ, Holbrook NM (2004a) Diurnal depression of leaf hydraulic
  57. conductance in a tropical tree species. Plant Cell Environ 27:
  58. 820–827
  59. Brodribb TJ, Holbrook NM (2004b) Stomatal protection against hydraulic
  60. failure: a comparison of coexisting ferns and angiosperms. New Phytol
  61. 162: 663–670
  62. Brodribb TJ, Holbrook NM, Zwieniecki MA, Palma B (2005) Leaf
  63. hydraulic capacity in ferns, conifers and angiosperms: impacts on
  64. photosynthetic maxima. New Phytol 165: 839–846
  65. Bucci SJ, Scholtz FG, Goldstein G, Meinzer FC, Sternberg L (2003)
  66. Dynamic changes in hydraulic conductivity in petioles of two savanna
  67. tree species: factors and mechanisms contributing to the refilling of
  68. embolized vessels. Plant Cell Environ 26: 1633–1645
  69. Bucholtz JT, Gray NE (1948) A taxonomic revision of the genus Podocarpus:
  70. the sections of the genus and their divisions with respect to leaf
  71. anatomy. J Arnold Arbor Harv Univ 29: 49–63
  72. Cochard H, Froux F, Mayr S, Coutard C (2004) Xylem wall collapse in
  73. water-stressed pine needles. Plant Physiol 134: 401–408
  74. Cuevas LE (1969) Shrinkage and collapse studies on Eucalyptus viminalis.
  75. J Inst Wood Sci 4: 29–38
  76. Dixon HH, Joly J (1895) On the ascent of sap. Philos Trans R Soc Lond 186:
  77. 563–576
  78. Esau K (1977). Anatomy of Seed Plants. John Wiley &amp; Sons, New York
  79. Griffith MM (1957) Folar ontogeny of Podocarpus macrophyllus with special
  80. reference to transfusion tissue. Am J Bot 44: 705–715
  81. Guitard D (1987) Me´chanique du Mate´riau Bois et Composites. Cepaudes-
  82. Editions, Toulouse, France
  83. Hacke U, Sperry JS, Pitterman J (2004) Analysis of circular bordered pit
  84. function: gymnosperm trachieds with torus margo pit membranes. Am J
  85. Bot 91: 386–400
  86. Hacke U, Sperry JS, Pockman WT, Davis SD, McCulloch A (2001) Trends
  87. in wood density and structure are linked to the prevention of xylem
  88. implosion by negative pressure. Oecologia 126: 457–461
  89. Hunter AJ (2001) Distribution of mechanical stresses in the cell wall
  90. induced by capillary tension in the lumen water: an approximate
  91. analysis. Wood Sci Technol 35: 283–296
  92. Innes TC (1995) Stress model of a wood fibre in relation to collapse. Wood
  93. Sci Technol 29: 363–376
  94. Jeje A, Zimmermann M (1979) Resistance to water flow in xylem vessels.
  95. J Exp Bot 30: 817–827
  96. Koide RT, Robichaux RH,Morse SR, Smith CM(1991) Plant water status,
  97. hydraulic resistance and capacitance. In RW Pearcy, J Ehleringer, HA
  98. Mooney, PW Rundel, eds, Plant Physiological Ecology. Chapman and
  99. Hall, New York, 161–183
  100. Pockman WT, Sperry JS, O’Leary JW (1995) Sustained and significant
  101. negative pressure in xylem. Nature 378: 715–716
  102. Raven JA (1977) Evolution of vascular land plants in relation to supracellular
  103. transport processes. Adv Bot Res 5: 153–219
  104. Sperry JS, Hacke U (2004) Analysis of circular bordered pit function:
  105. angiosperm vessels with homogeneous pit membranes. Am J Bot 91:
  106. 369–385
  107. Tiemann HD (1915) Principles of kiln drying. Lumber World Review 15:
  108. 15–25
  109. Timoshenko S (1930) Strength of Materials. MacMillan and Company,
  110. London
  111. TyreeMT, Hammel HT (1972) The measurement of the turgor pressure and
  112. the water relations of plants by the pressure-bomb technique. J Exp Bot
  113. 23: 267–282
  114. Zwieniecki MA, Hutyra L, ThompsonMV, Holbrook NM (2000) Dynamic
  115. changes in petiole specific conductivity in red maple (Acer rubrum L.),
  116. tulip tree (Liriodendron tulipifera L.) and northern fox grape (Vitis labrusca
  117. L.). Plant Cell Environ 23: 407–414
  118. Brodribb and Holbrook
  119. 1146" name="eprints.referencetext" />
  120. <meta content="Brodribb, Tim J. and Holbrook, N. M. (2005) Water Stress Deforms Tracheids Peripheral to the Leaf Vein of a Tropical Conifer. Plant Physiology, 137 . pp. 1139-1146. ISSN 0032-0889" name="eprints.citation" />
  121. <meta content="http://eprints.utas.edu.au/2587/1/trachied__squish.pdf" name="eprints.document_url" />
  122. <link rel="schema.DC" href="http://purl.org/DC/elements/1.0/" />
  123. <meta content="Water Stress Deforms Tracheids Peripheral to the
  124. Leaf Vein of a Tropical Conifer" name="DC.title" />
  125. <meta content="Brodribb, Tim J." name="DC.creator" />
  126. <meta content="Holbrook, N. M." name="DC.creator" />
  127. <meta content="270402 Plant Physiology" name="DC.subject" />
  128. <meta content="270400 Botany" name="DC.subject" />
  129. <meta content="Just as a soggy paper straw is prone to yielding under the applied suction of a thirsty drinker, the xylem tracheids in leaves
  130. seem prone to collapse as water potential declines, impeding their function. Here we describe the collapse, under tension, of
  131. lignified cells peripheral to the leaf vein of a broad-leaved rainforest conifer, Podocarpus grayi de Laub. Leaves of Podocarpus
  132. are characterized by an array of cylindrical tracheids aligned perpendicular to the leaf vein, apparently involved in the
  133. distribution of water radially through the mesophyll. During leaf desiccation the majority of these tracheids collapsed from
  134. circular to flat over the water potential range 21.5 to 22.8 MPa. An increase in the percentage of tracheids collapsed during
  135. imposed water stress was mirrored by declining leaf hydraulic conductivity (Kleaf), implying a direct effect on water transport
  136. efficiency. Stomata responded to water stress by closing at 22.0 MPa when 45% of cells were collapsed and Kleaf had declined
  137. by 25%. This was still substantially before the initial indications of cavitation-induced loss of hydraulic conductance in the leaf
  138. vein, at 23 MPa. Plants droughted until 49% of tracheids had collapsed were found to fully recover tracheid shape and leaf
  139. function 1 week after rewatering. A simple mechanical model of tracheid collapse, derived from the theoretical buckling
  140. pressure for pipes, accurately predicted the collapse dynamics observed in P. grayi, substantiating estimates of cell wall
  141. elasticity and measured leaf water potential. The possible adaptive advantages of collapsible vascular tissue are discussed." name="DC.description" />
  142. <meta content="2005" name="DC.date" />
  143. <meta content="Article" name="DC.type" />
  144. <meta content="PeerReviewed" name="DC.type" />
  145. <meta content="application/pdf" name="DC.format" />
  146. <meta content="http://eprints.utas.edu.au/2587/1/trachied__squish.pdf" name="DC.identifier" />
  147. <meta content="http://dx.doi.org/10.1104/pp.104.058156" name="DC.relation" />
  148. <meta content="Brodribb, Tim J. and Holbrook, N. M. (2005) Water Stress Deforms Tracheids Peripheral to the Leaf Vein of a Tropical Conifer. Plant Physiology, 137 . pp. 1139-1146. ISSN 0032-0889" name="DC.identifier" />
  149. <meta content="http://eprints.utas.edu.au/2587/" name="DC.relation" />
  150. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2587/BibTeX/epprod-eprint-2587.bib" title="BibTeX" type="text/plain" />
  151. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2587/ContextObject/epprod-eprint-2587.xml" title="OpenURL ContextObject" type="text/xml" />
  152. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2587/ContextObject::Dissertation/epprod-eprint-2587.xml" title="OpenURL Dissertation" type="text/xml" />
  153. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2587/ContextObject::Journal/epprod-eprint-2587.xml" title="OpenURL Journal" type="text/xml" />
  154. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2587/DC/epprod-eprint-2587.txt" title="Dublin Core" type="text/plain" />
  155. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2587/DIDL/epprod-eprint-2587.xml" title="DIDL" type="text/xml" />
  156. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2587/EndNote/epprod-eprint-2587.enw" title="EndNote" type="text/plain" />
  157. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2587/HTML/epprod-eprint-2587.html" title="HTML Citation" type="text/html; charset=utf-8" />
  158. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2587/METS/epprod-eprint-2587.xml" title="METS" type="text/xml" />
  159. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2587/MODS/epprod-eprint-2587.xml" title="MODS" type="text/xml" />
  160. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2587/RIS/epprod-eprint-2587.ris" title="Reference Manager" type="text/plain" />
  161. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2587/Refer/epprod-eprint-2587.refer" title="Refer" type="text/plain" />
  162. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2587/Simple/epprod-eprint-2587text" title="Simple Metadata" type="text/plain" />
  163. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2587/Text/epprod-eprint-2587.txt" title="ASCII Citation" type="text/plain; charset=utf-8" />
  164. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2587/XML/epprod-eprint-2587.xml" title="EP3 XML" type="text/xml" />
  165.  
  166.   </head>
  167.   <body bgcolor="#ffffff" text="#000000" onLoad="loadRoutine(); MM_preloadImages('images/eprints/ePrints_banner_r5_c5_f2.gif','images/eprints/ePrints_banner_r5_c7_f2.gif','images/eprints/ePrints_banner_r5_c8_f2.gif','images/eprints/ePrints_banner_r5_c9_f2.gif','images/eprints/ePrints_banner_r5_c10_f2.gif','images/eprints/ePrints_banner_r5_c11_f2.gif','images/eprints/ePrints_banner_r6_c4_f2.gif')">
  168.     
  169.     <div class="ep_noprint"><noscript><style type="text/css">@import url(http://eprints.utas.edu.au/style/nojs.css);</style></noscript></div>
  170.  
  171.  
  172.  
  173.  
  174. <table width="795" border="0" cellspacing="0" cellpadding="0">
  175.   <tr>
  176.     <td><script language="JavaScript1.2">mmLoadMenus();</script>
  177.       <table border="0" cellpadding="0" cellspacing="0" width="795">
  178.         <!-- fwtable fwsrc="eprints_banner_final2.png" fwbase="ePrints_banner.gif" fwstyle="Dreamweaver" fwdocid = "1249563342" fwnested="0" -->
  179.         <tr>
  180.           <td><img src="/images/eprints/spacer.gif" width="32" height="1" border="0" alt="" /></td>
  181.           <td><img src="/images/eprints/spacer.gif" width="104" height="1" border="0" alt="" /></td>
  182.           <td><img src="/images/eprints/spacer.gif" width="44" height="1" border="0" alt="" /></td>
  183.           <td><img src="/images/eprints/spacer.gif" width="105" height="1" border="0" alt="" /></td>
  184.           <td><img src="/images/eprints/spacer.gif" width="41" height="1" border="0" alt="" /></td>
  185.           <td><img src="/images/eprints/spacer.gif" width="16" height="1" border="0" alt="" /></td>
  186.           <td><img src="/images/eprints/spacer.gif" width="68" height="1" border="0" alt="" /></td>
  187.           <td><img src="/images/eprints/spacer.gif" width="68" height="1" border="0" alt="" /></td>
  188.           <td><img src="/images/eprints/spacer.gif" width="68" height="1" border="0" alt="" /></td>
  189.           <td><img src="/images/eprints/spacer.gif" width="82" height="1" border="0" alt="" /></td>
  190.           <td><img src="/images/eprints/spacer.gif" width="69" height="1" border="0" alt="" /></td>
  191.           <td><img src="/images/eprints/spacer.gif" width="98" height="1" border="0" alt="" /></td>
  192.           <td><img src="/images/eprints/spacer.gif" width="1" height="1" border="0" alt="" /></td>
  193.         </tr>
  194.         <tr>
  195.           <td colspan="12"><img name="ePrints_banner_r1_c1" src="/images/eprints/ePrints_banner_r1_c1.gif" width="795" height="10" border="0" alt="" /></td>
  196.           <td><img src="/images/eprints/spacer.gif" width="1" height="10" border="0" alt="" /></td>
  197.         </tr>
  198.         <tr>
  199.           <td rowspan="6"><img name="ePrints_banner_r2_c1" src="/images/eprints/ePrints_banner_r2_c1.gif" width="32" height="118" border="0" alt="" /></td>
  200.           <td rowspan="5"><a href="http://www.utas.edu.au/"><img name="ePrints_banner_r2_c2" src="/images/eprints/ePrints_banner_r2_c2.gif" width="104" height="103" border="0" alt="" /></a></td>
  201.           <td colspan="10"><img name="ePrints_banner_r2_c3" src="/images/eprints/ePrints_banner_r2_c3.gif" width="659" height="41" border="0" alt="" /></td>
  202.           <td><img src="/images/eprints/spacer.gif" width="1" height="41" border="0" alt="" /></td>
  203.         </tr>
  204.         <tr>
  205.           <td colspan="3"><a href="http://eprints.utas.edu.au/"><img name="ePrints_banner_r3_c3" src="/images/eprints/ePrints_banner_r3_c3.gif" width="190" height="31" border="0" alt="" /></a></td>
  206.           <td rowspan="2" colspan="7"><img name="ePrints_banner_r3_c6" src="/images/eprints/ePrints_banner_r3_c6.gif" width="469" height="37" border="0" alt="" /></td>
  207.           <td><img src="/images/eprints/spacer.gif" width="1" height="31" border="0" alt="" /></td>
  208.         </tr>
  209.         <tr>
  210.           <td colspan="3"><img name="ePrints_banner_r4_c3" src="/images/eprints/ePrints_banner_r4_c3.gif" width="190" height="6" border="0" alt="" /></td>
  211.           <td><img src="/images/eprints/spacer.gif" width="1" height="6" border="0" alt="" /></td>
  212.         </tr>
  213.         <tr>
  214.           <td colspan="2"><img name="ePrints_banner_r5_c3" src="/images/eprints/ePrints_banner_r5_c3.gif" width="149" height="1" border="0" alt="" /></td>
  215.           <td rowspan="2" colspan="2"><a href="/information.html" onMouseOut="MM_swapImgRestore();MM_startTimeout()" onMouseOver="MM_showMenu(window.mm_menu_0821132634_0,0,25,null,'ePrints_banner_r5_c5');MM_swapImage('ePrints_banner_r5_c5','','/images/eprints/ePrints_banner_r5_c5_f2.gif',1);"><img name="ePrints_banner_r5_c5" src="/images/eprints/ePrints_banner_r5_c5.gif" width="57" height="25" border="0" alt="About" /></a></td>
  216.           <td rowspan="2"><a href="/view/" onMouseOut="MM_swapImgRestore();MM_startTimeout()" onMouseOver="MM_showMenu(window.mm_menu_0821133021_1,0,25,null,'ePrints_banner_r5_c7');MM_swapImage('ePrints_banner_r5_c7','','/images/eprints/ePrints_banner_r5_c7_f2.gif',1);"><img name="ePrints_banner_r5_c7" src="/images/eprints/ePrints_banner_r5_c7.gif" width="68" height="25" border="0" alt="Browse" /></a></td>
  217.           <td rowspan="2"><a href="/perl/search/simple" onMouseOut="MM_swapImgRestore();MM_startTimeout()" onMouseOver="MM_showMenu(window.mm_menu_0821133201_2,0,25,null,'ePrints_banner_r5_c8');MM_swapImage('ePrints_banner_r5_c8','','/images/eprints/ePrints_banner_r5_c8_f2.gif',1);"><img name="ePrints_banner_r5_c8" src="/images/eprints/ePrints_banner_r5_c8.gif" width="68" height="25" border="0" alt="Search" /></a></td>
  218.           <td rowspan="2"><a href="/perl/register" onMouseOut="MM_swapImgRestore();MM_startTimeout();" onMouseOver="MM_showMenu(window.mm_menu_1018171924_3,0,25,null,'ePrints_banner_r5_c9');MM_swapImage('ePrints_banner_r5_c9','','/images/eprints/ePrints_banner_r5_c9_f2.gif',1);"><img name="ePrints_banner_r5_c9" src="/images/eprints/ePrints_banner_r5_c9.gif" width="68" height="25" border="0" alt="register" /></a></td>
  219.           <td rowspan="2"><a href="/perl/users/home" onMouseOut="MM_swapImgRestore();MM_startTimeout()" onMouseOver="MM_showMenu(window.mm_menu_0821133422_4,0,25,null,'ePrints_banner_r5_c10');MM_swapImage('ePrints_banner_r5_c10','','/images/eprints/ePrints_banner_r5_c10_f2.gif',1);"><img name="ePrints_banner_r5_c10" src="/images/eprints/ePrints_banner_r5_c10.gif" width="82" height="25" border="0" alt="user area" /></a></td>
  220.           <td rowspan="2"><a href="/help/" onMouseOut="MM_swapImgRestore();MM_startTimeout()" onMouseOver="MM_showMenu(window.mm_menu_0821133514_5,0,25,null,'ePrints_banner_r5_c11');MM_swapImage('ePrints_banner_r5_c11','','/images/eprints/ePrints_banner_r5_c11_f2.gif',1);"><img name="ePrints_banner_r5_c11" src="/images/eprints/ePrints_banner_r5_c11.gif" width="69" height="25" border="0" alt="Help" /></a></td>
  221.           <td rowspan="3" colspan="4"><img name="ePrints_banner_r5_c12" src="/images/eprints/ePrints_banner_r5_c12.gif" width="98" height="40" border="0" alt="" /></td>
  222.           <td><img src="/images/eprints/spacer.gif" width="1" height="1" border="0" alt="" /></td>
  223.         </tr>
  224.         <tr>
  225.           <td rowspan="2"><img name="ePrints_banner_r6_c3" src="/images/eprints/ePrints_banner_r6_c3.gif" width="44" height="39" border="0" alt="ePrints home" /></td>
  226.           <td><a href="/" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('ePrints_banner_r6_c4','','/images/eprints/ePrints_banner_r6_c4_f2.gif',1);"><img name="ePrints_banner_r6_c4" src="/images/eprints/ePrints_banner_r6_c4.gif" width="105" height="24" border="0" alt="ePrints home" /></a></td>
  227.           <td><img src="/images/eprints/spacer.gif" width="1" height="24" border="0" alt="" /></td>
  228.         </tr>
  229.         <tr>
  230.           <td><img name="ePrints_banner_r7_c2" src="/images/eprints/ePrints_banner_r7_c2.gif" width="104" height="15" border="0" alt="" /></td>
  231.           <td colspan="8"><img name="ePrints_banner_r7_c4" src="/images/eprints/ePrints_banner_r7_c4.gif" width="517" height="15" border="0" alt="" /></td>
  232.           <td><img src="/images/eprints/spacer.gif" width="1" height="15" border="0" alt="" /></td>
  233.         </tr>
  234.       </table></td>
  235.   </tr>
  236.     <tr><td><table width="100%" style="font-size: 90%; border: solid 1px #ccc; padding: 3px"><tr>
  237.       <td align="left"><a href="http://eprints.utas.edu.au/cgi/users/home">Login</a> | <a href="http://eprints.utas.edu.au/cgi/register">Create Account</a></td>
  238.       <td align="right" style="white-space: nowrap">
  239.         <form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/search" style="display:inline">
  240.           <input class="ep_tm_searchbarbox" size="20" type="text" name="q" />
  241.           <input class="ep_tm_searchbarbutton" value="Search" type="submit" name="_action_search" />
  242.           <input type="hidden" name="_order" value="bytitle" />
  243.           <input type="hidden" name="basic_srchtype" value="ALL" />
  244.           <input type="hidden" name="_satisfyall" value="ALL" />
  245.         </form>
  246.       </td>
  247.     </tr></table></td></tr>
  248.   <tr>
  249.     <td class="toplinks"><!-- InstanceBeginEditable name="content" -->
  250.  
  251.  
  252. <div align="center">
  253.   
  254.   <table width="720" class="ep_tm_main"><tr><td align="left">
  255.     <h1 class="ep_tm_pagetitle">Water Stress Deforms Tracheids Peripheral to the Leaf Vein of a Tropical Conifer</h1>
  256.     <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>Water Stress Deforms Tracheids Peripheral to the Leaf Vein of a Tropical Conifer.</xhtml:em> Plant Physiology, 137 . pp. 1139-1146. ISSN 0032-0889</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/2587/1/trachied__squish.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/2587/1/trachied__squish.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />223Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="3394" 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/10.1104/pp.104.058156">http://dx.doi.org/10.1104/pp.104.058156</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Just as a soggy paper straw is prone to yielding under the applied suction of a thirsty drinker, the xylem tracheids in leaves&#13;
  257. seem prone to collapse as water potential declines, impeding their function. Here we describe the collapse, under tension, of&#13;
  258. lignified cells peripheral to the leaf vein of a broad-leaved rainforest conifer, Podocarpus grayi de Laub. Leaves of Podocarpus&#13;
  259. are characterized by an array of cylindrical tracheids aligned perpendicular to the leaf vein, apparently involved in the&#13;
  260. distribution of water radially through the mesophyll. During leaf desiccation the majority of these tracheids collapsed from&#13;
  261. circular to flat over the water potential range 21.5 to 22.8 MPa. An increase in the percentage of tracheids collapsed during&#13;
  262. imposed water stress was mirrored by declining leaf hydraulic conductivity (Kleaf), implying a direct effect on water transport&#13;
  263. efficiency. Stomata responded to water stress by closing at 22.0 MPa when 45% of cells were collapsed and Kleaf had declined&#13;
  264. by 25%. This was still substantially before the initial indications of cavitation-induced loss of hydraulic conductance in the leaf&#13;
  265. vein, at 23 MPa. Plants droughted until 49% of tracheids had collapsed were found to fully recover tracheid shape and leaf&#13;
  266. function 1 week after rewatering. A simple mechanical model of tracheid collapse, derived from the theoretical buckling&#13;
  267. pressure for pipes, accurately predicted the collapse dynamics observed in P. grayi, substantiating estimates of cell wall&#13;
  268. elasticity and measured leaf water potential. The possible adaptive advantages of collapsible vascular tissue are discussed.</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">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">2587</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 14:59</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=2587;">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=2587">item control page</a></p>
  269.   </td></tr></table>
  270. </div>
  271.  
  272.  
  273.  
  274.     <!-- InstanceEndEditable --></td>
  275.   </tr>
  276.   <tr>
  277.     <td><!-- #BeginLibraryItem "/Library/footer_eprints.lbi" -->
  278.     <table width="795" border="0" align="left" cellpadding="0" class="footer">
  279.   <tr valign="top">
  280. <td colspan="2"><div align="center"><a href="http://www.utas.edu.au">UTAS home</a> | <a href="http://www.utas.edu.au/library/">Library home</a> | <a href="/">ePrints home</a> | <a href="/contact.html">contact</a> | <a href="/information.html">about</a> | <a href="/view/">browse</a> | <a href="/perl/search/simple">search</a> | <a href="/perl/register">register</a> | <a href="/perl/users/home">user area</a> | <a href="/help/">help</a></div><br /></td>
  281. </tr>
  282. <tr><td colspan="2"><p><img src="/images/eprints/footerline.gif" width="100%" height="4" /></p></td></tr>
  283.       <tr valign="top">
  284.         <td width="68%" class="footer">Authorised by the University Librarian<br />
  285. © University of Tasmania ABN 30 764 374 782<br />
  286.       <a href="http://www.utas.edu.au/cricos/">CRICOS Provider Code 00586B</a> | <a href="http://www.utas.edu.au/copyright/copyright_disclaimers.html">Copyright &amp; Disclaimers</a> | <a href="http://www.utas.edu.au/accessibility/index.html">Accessibility</a> | <a href="http://eprints.utas.edu.au/feedback/">Site Feedback</a>  </td>
  287.         <td width="32%"><div align="right">
  288.             <p align="right" class="NoPrint"><a href="http://www.utas.edu.au/"><img src="http://www.utas.edu.au/shared/logos/unioftasstrip.gif" alt="University of Tasmania Home Page" width="260" height="16" border="0" align="right" /></a></p>
  289.             <p align="right" class="NoPrint"><a href="http://www.utas.edu.au/"><br />
  290.             </a></p>
  291.         </div></td>
  292.       </tr>
  293.       <tr valign="top">
  294.         <td><p>  </p></td>
  295.         <td><div align="right"><span class="NoPrint"><a href="http://www.eprints.org/software/"><img src="/images/eprintslogo.gif" alt="ePrints logo" width="77" height="29" border="0" align="bottom" /></a></span></div></td>
  296.       </tr>
  297.     </table>
  298.     <!-- #EndLibraryItem -->
  299.     <div align="center"></div></td>
  300.   </tr>
  301. </table>
  302.  
  303.   </body>
  304. </html>