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  5.     <title>UTas ePrints - Hydraulic design of leaves: insights from rehydration kinetics</title>
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  13.     <meta content="Zwieniecki, Maciej A." name="eprints.creators_name" />
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  29. <meta content="venation pattern; bundle sheath extension; transpiration
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  31. <meta content="&quot;The definitive version is available at www.blackwell-synergy.com&quot;
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  33. <meta content="We examined the leaf hydraulic design in 10 species based on
  34. their rehydration kinetics. In all cases, a biphasic response
  35. described the temporal pattern of water uptake, with time
  36. constants of ~30 to 800 s and ~800 to 8000 s. The time constants
  37. of the fast phase were significantly shorter in the six
  38. angiosperms (30 to 110 s) compared with the two singleveined
  39. conifer species (>400 s) examined, while the two
  40. multi-veined gymnosperm species, Gnetum gnemon and
  41. Ginkgo biloba, had time constants for the fast phase of
  42. ~150 s. Among angiosperm species, the fast phase constituted
  43. 50–90% of the total water absorbed, whereas in gymnosperms
  44. 70–90% of the water uptake could be assigned to
  45. the slow phase. In the four gymnosperms, the relative water
  46. uptake corresponding to the fast phase matched to a good
  47. degree the relative volume of the venation and bundle
  48. sheath extension; whereas in the angiosperm species, the
  49. relatively larger water influx during the fast phase was
  50. similar in relative volume to the combined venation, bundle
  51. sheath extension, epidermis and (in four species) the spongy
  52. mesophyll. This suggests a general trend from a design in
  53. which the epidermis is weakly connected to the veins (all
  54. four gymnosperms), to a design with good hydraulic connection
  55. between epidermis and veins that largely bypasses the
  56. mesophyll (four of six angiosperms), to a design in which
  57. almost the entire leaf appears to function as a single pool." name="eprints.abstract" />
  58. <meta content="2007" name="eprints.date" />
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  188. leaf water – evidence and implications for the use of isotopic
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  192. oxygen-18 enrichment in leaf water of cotton plants grown under
  193. wet and dry conditions: evidence for water compartmentation
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  196. N.M. (2002) The hydraulic architecture of the leaf venation in
  197. Laurus nobilis L. Plant, Cell &amp; Environment 25, 1445–1450.
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  199. limitations imposed by crown placement determine final size and
  200. shape of Quercus rubra L. leaves. Plant, Cell &amp; Environment 27,
  201. 357–365." name="eprints.referencetext" />
  202. <meta content="Zwieniecki, Maciej A. and Brodribb, Tim J. and Holbrook, N. M. (2007) Hydraulic design of leaves: insights from rehydration kinetics. Plant, Cell and Environment, 30 (8). pp. 910-921. ISSN 0140-7791" name="eprints.citation" />
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  212. <meta content="We examined the leaf hydraulic design in 10 species based on
  213. their rehydration kinetics. In all cases, a biphasic response
  214. described the temporal pattern of water uptake, with time
  215. constants of ~30 to 800 s and ~800 to 8000 s. The time constants
  216. of the fast phase were significantly shorter in the six
  217. angiosperms (30 to 110 s) compared with the two singleveined
  218. conifer species (>400 s) examined, while the two
  219. multi-veined gymnosperm species, Gnetum gnemon and
  220. Ginkgo biloba, had time constants for the fast phase of
  221. ~150 s. Among angiosperm species, the fast phase constituted
  222. 50–90% of the total water absorbed, whereas in gymnosperms
  223. 70–90% of the water uptake could be assigned to
  224. the slow phase. In the four gymnosperms, the relative water
  225. uptake corresponding to the fast phase matched to a good
  226. degree the relative volume of the venation and bundle
  227. sheath extension; whereas in the angiosperm species, the
  228. relatively larger water influx during the fast phase was
  229. similar in relative volume to the combined venation, bundle
  230. sheath extension, epidermis and (in four species) the spongy
  231. mesophyll. This suggests a general trend from a design in
  232. which the epidermis is weakly connected to the veins (all
  233. four gymnosperms), to a design with good hydraulic connection
  234. between epidermis and veins that largely bypasses the
  235. mesophyll (four of six angiosperms), to a design in which
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  350.     <h1 class="ep_tm_pagetitle">Hydraulic design of leaves: insights from rehydration kinetics</h1>
  351.     <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Zwieniecki, Maciej A.</span> and <span class="person_name">Brodribb, Tim J.</span> and <span class="person_name">Holbrook, N. M.</span> (2007) <xhtml:em>Hydraulic design of leaves: insights from rehydration kinetics.</xhtml:em> Plant, Cell and Environment, 30 (8). pp. 910-921. 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/2580/1/Zweiniecki_Brod.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/2580/1/Zweiniecki_Brod.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />764Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="3388" 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.1365-3040.2007.001681.x">http://dx.doi.org/10.1111/j.1365-3040.2007.001681.x</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">We examined the leaf hydraulic design in 10 species based on&#13;
  352. their rehydration kinetics. In all cases, a biphasic response&#13;
  353. described the temporal pattern of water uptake, with time&#13;
  354. constants of ~30 to 800 s and ~800 to 8000 s. The time constants&#13;
  355. of the fast phase were significantly shorter in the six&#13;
  356. angiosperms (30 to 110 s) compared with the two singleveined&#13;
  357. conifer species (&gt;400 s) examined, while the two&#13;
  358. multi-veined gymnosperm species, Gnetum gnemon and&#13;
  359. Ginkgo biloba, had time constants for the fast phase of&#13;
  360. ~150 s. Among angiosperm species, the fast phase constituted&#13;
  361. 50–90% of the total water absorbed, whereas in gymnosperms&#13;
  362. 70–90% of the water uptake could be assigned to&#13;
  363. the slow phase. In the four gymnosperms, the relative water&#13;
  364. uptake corresponding to the fast phase matched to a good&#13;
  365. degree the relative volume of the venation and bundle&#13;
  366. sheath extension; whereas in the angiosperm species, the&#13;
  367. relatively larger water influx during the fast phase was&#13;
  368. similar in relative volume to the combined venation, bundle&#13;
  369. sheath extension, epidermis and (in four species) the spongy&#13;
  370. mesophyll. This suggests a general trend from a design in&#13;
  371. which the epidermis is weakly connected to the veins (all&#13;
  372. four gymnosperms), to a design with good hydraulic connection&#13;
  373. between epidermis and veins that largely bypasses the&#13;
  374. mesophyll (four of six angiosperms), to a design in which&#13;
  375. almost the entire leaf appears to function as a single pool.</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"&#13;
  376. </td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">venation pattern; bundle sheath extension; transpiration&#13;
  377. stream; hydraulic compartmentalization.</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">2580</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 11:35</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=2580;">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=2580">item control page</a></p>
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