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  5.     <title>UTas ePrints - Changes in leaf hydraulic conductance during leaf shedding in seasonally dry tropical forest</title>
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  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" />
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  21. <meta content="Changes in leaf hydraulic conductance during leaf
  22. shedding in seasonally dry tropical forest" name="eprints.title" />
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  24. <meta content="270402" name="eprints.subjects" />
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  27. <meta content="The definitive version is available at www.blackwell-synergy.com
  28. " name="eprints.note" />
  29. <meta content="• The hydraulic conductance of leaves (
  30. k
  31. leaf
  32. ) was examined to determine whether
  33. this little understood component of the water transport pathway plays a role
  34. in governing leaf phenology of two deciduous dry forest trees (
  35. Calycophyllum
  36. candidissimum
  37. and
  38. Rhedera trinervis
  39. ).
  40. •
  41. k
  42. leaf
  43. was monitored in parallel with stem hydraulic conductivity (K
  44. stem
  45. ) during the
  46. transition from wet to dry season. The relationships between declining photosynthetic
  47. quantum yield during senescence and declining
  48. k
  49. leaf
  50. and K
  51. stem
  52. were compared.
  53. • Divergent patterns were observed in the response of K
  54. stem
  55. to seasonal drying;
  56. however, the behaviour of
  57. k
  58. leaf
  59. was essentially similar in both species. Large (five- to
  60. ten-fold) decreases in leaf hydraulic conductance occurred before, and during the
  61. later stages of leaf senescence. During senescence, declining
  62. k
  63. leaf
  64. , which continued
  65. until leaves were ultimately shed, was associated with a concomitant decline in
  66. quantum yield.
  67. • We conclude that, in these species, the loss of hydraulic conductance of the leaf
  68. vascular system is linked to, and possibly responsible for, the loss of photosynthetic
  69. capacity during leaf senescence." name="eprints.abstract" />
  70. <meta content="2003" name="eprints.date" />
  71. <meta content="published" name="eprints.date_type" />
  72. <meta content="New Phytologist" name="eprints.publication" />
  73. <meta content="158" name="eprints.volume" />
  74. <meta content="295-303" name="eprints.pagerange" />
  75. <meta content="10.1046/j.1469-8137.2003.00736.x" name="eprints.id_number" />
  76. <meta content="TRUE" name="eprints.refereed" />
  77. <meta content="0028-646X" name="eprints.issn" />
  78. <meta content="http://dx.doi.org/10.1046/j.1469-8137.2003.00736.x" name="eprints.official_url" />
  79. <meta content="Becker P, Tyree MT, Tsuda M. 1999. Hydraulic conductances of
  80. angiosperms versus conifers: similar transport efficiency at the whole-plant
  81. level. Tree Physiology 19: 445–452.
  82. Bilger W, Schreiber U, Buck M. 1996. Determination of the quantum
  83. efficiency of photosystem II and non-photochemical quenching of
  84. chlorophyll fluorescence in the field. Oecologia 102: 425–432.
  85. Brodribb TJ, Field TS. 2000. Stem hydraulic supply is linked to leaf
  86. photosynthetic capacity: evidence from New Caledonian and Tasmanian
  87. rainforests. Plant, Cell &amp; Environment 23: 1381–1388.
  88. Brodribb TJ, Holbrook NM, Gutiérrez MV. 2002a. Hydraulic and
  89. photosynthetic co-ordination in seasonally dry tropical forest trees. Plant,
  90. Cell &amp; Environment 25: 1435–1444.
  91. Brodribb TJ, Holbrook NM, Edwards EJ, Gutiérrez MV. 2002b. Relations
  92. between stomatal closure, leaf turgor and xylem vulnerability in eight
  93. tropical dry forest trees. Plant, Cell &amp; Environment (In press.)
  94. Canny M. 1990. What becomes of the transpiration stream? New Phytologist
  95. 114: 341–368.
  96. Daubenmire R. 1972. Phenology and other characteristics of tropical
  97. semi-deciduous forest in northeastern Costa Rica. Journal of Ecology 60:
  98. 147–170.
  99. Enquist BJ, Leffler AJ. 2001. Long-term tree ring chronologies from
  100. sympatric tropical dry-forest trees: individualistic responses to climatic
  101. variation. Journal of Tropical Ecology 17: 41–60.
  102. Fahn A. 1990. Plant anatomy, 4th edn. New York, NY, USA: Pergamon Press.
  103. Frankie GW, Baker HG, Opler PA. 1974. Comparative phenological studies
  104. of trees in tropical wet and dry forests in the lowlands of Costa Rica.
  105. Journal of Ecology 62: 881–919.
  106. Hacke UG, Stiller V, Sperry JS, Pittermann J, McCulloh KA. 2001.
  107. Cavitation fatigue. Embolism and refilling cycles can weaken the
  108. cavitation resistance of xylem. Plant Physiology 125: 779–786.
  109. van den Honert TH. 1948. Water transport in plants as a catenary process.
  110. Discussions of the Faraday Society 3: 146–153.
  111. Horton P, Ruban AV, Walters RG. 1996. Regulation of light harvesting in
  112. green plants. Annual Review of Plant Physiology and Molecular Biology 47:
  113. 655–684.
  114. Hubbard RM, Bond BJ, Ryan MG. 1999. Evidence that hydraulic
  115. conductance limits photosynthesis in old Pinus ponderosa trees.
  116. Tree Physiology 19: 165–172.
  117. Hubbard RM, Ryan MG, Stiller V, Sperry JS. 2001. Stomatal conductance
  118. and photosynthesis vary linearly with plant hydraulic conductance in
  119. ponderosa pine. Plant, Cell &amp; Environment 24: 113–121.
  120. Janzen DH. 1983. Costa Rican natural history. Chicago, IL, USA: University
  121. of Chicago Press.
  122. Janzen DH, Waterman PG. 1984. A seasonal census of phenolics, fibre and
  123. alkaloids in foliage of forest trees in Costa Rica: some factors influencing
  124. their distribution and relation to host selection by Sphingidae and
  125. Saturniidae. Biological Journal of the Linnean Society 21: 439–454.
  126. Kramer PJ, Boyer JS. 1995. Water relations of plants and soils. San Diego, CA,
  127. USA: Academic Press.
  128. Machado J-L, Tyree MT. 1994. Patterns of hydraulic architecture and water
  129. relations of two tropical canopy trees with contrasting leaf phenologies:
  130. Ochroma pyramidale and Pseudobombax septenatum. Tree Physiology 14:
  131. 219–240.
  132. Milburn JA. 1973. Cavitation in Ricinus by acoustic detection: induction in
  133. excised leaves by various factors. Planta 18: 253–265.
  134. Nardini A. 2001. Are sclerophylls and malacophylls hydraulically different?
  135. Biologia Plantarum 44: 239–245.
  136. Nardini A, Tyree MT. 2000. Limitation of stomatal conductance by
  137. hydraulic traits: sensing or preventing xylem cavitation? Trees 15: 14–24.
  138. Nardini A, Tyree MT, Salleo S. 2001. Xylem cavitation in the leaf of Prunus
  139. laurocerasus L. and its impact on leaf hydraulics. Plant Physiology 125:
  140. 1700–1709.
  141. Prior LD, Eamus D. 2000. Seasonal changes in hydraulic conductance,
  142. xylem embolism and leaf area in Eucalyptus tetrodonta and Eucalyptus
  143. miniata saplings in a north Australian savanna. Plant, Cell &amp; Environment
  144. 23: 955–965.
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  146. of the fast and slow reversible components of non-photochemical
  147. quenching in isolated pea thylakoids by picosecond time-resolved
  148. chlorophyll fluorescence analysis. Biochemistry 38: 12718–12726.
  149. Sack L, Melcher PJ, Zwieniecki MA, Holbrook NM. 2002. The
  150. hydraulic conductance of the angiosperm leaf lamina: a comparison
  151. of three measurement methods. Journal of Experimental Botany 53:
  152. 2177–2184.
  153. Saliendra NZ, Sperry JS, Comstock JP. 1995. Influence of leaf water status
  154. on stomatal response to humidity, hydraulic conductance, and soil
  155. drought in Betula occidentalis. Planta 196: 357–366.
  156. Salleo S, Lo Gullo MA, Raimondo F, Nardini A. 2001. Vulnerability to
  157. cavitation of leaf minor veins: any impact on leaf gas exchange? Plant, Cell
  158. &amp; Environment 24: 851–859.
  159. Salleo S, Nardini A, Lo Gullo MA, Ghirardelli LA. 2002. Changes in stem
  160. and leaf hydraulics preceding leaf shedding in Castanea sativa L. Biologia
  161. Plantarum 45: 227–234.
  162. Sobrado MA. 1986. Aspects of tissue water relations and seasonal changes of
  163. leaf water potential components of evergreen and deciduous species
  164. coexisting in tropical dry forests. Oecologia 68: 413–416.
  165. Sobrado MA. 1993. Trade-off between water transport efficiency and leaf
  166. life-span in a tropical dry forest. Oecologia 96: 19–23.
  167. Sperry JS. 2000. Hydraulic constraints on plant gas exchange. Agricultural
  168. and Forest Meteorology 104: 13–23.
  169. Sperry JS, Alder NN, Eastlack SE. 1993. The effect of reduced hydraulic
  170. conductance on stomatal conductance and xylem cavitation. Journal of
  171. Experimental Botany 44: 1075–1082.
  172. Tyree MT. 1997. The cohesion–tension theory of sap ascent: current
  173. controversies. Journal of Experimnetal Botany 48: 1753–1765.
  174. Zwieniecki MA, Melcher PJ, Holbrook NM. 2001. Hydrogel control of
  175. xylem hydraulic resistance in plants. Science 291: 1059–1062." name="eprints.referencetext" />
  176. <meta content="Brodribb, Tim J. and Holbrook, N. M (2003) Changes in leaf hydraulic conductance during leaf shedding in seasonally dry tropical forest. New Phytologist, 158 . pp. 295-303. ISSN 0028-646X" name="eprints.citation" />
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  179. <meta content="Changes in leaf hydraulic conductance during leaf
  180. shedding in seasonally dry tropical forest" name="DC.title" />
  181. <meta content="Brodribb, Tim J." name="DC.creator" />
  182. <meta content="Holbrook, N. M" name="DC.creator" />
  183. <meta content="270402 Plant Physiology" name="DC.subject" />
  184. <meta content="270400 Botany" name="DC.subject" />
  185. <meta content="• The hydraulic conductance of leaves (
  186. k
  187. leaf
  188. ) was examined to determine whether
  189. this little understood component of the water transport pathway plays a role
  190. in governing leaf phenology of two deciduous dry forest trees (
  191. Calycophyllum
  192. candidissimum
  193. and
  194. Rhedera trinervis
  195. ).
  196. •
  197. k
  198. leaf
  199. was monitored in parallel with stem hydraulic conductivity (K
  200. stem
  201. ) during the
  202. transition from wet to dry season. The relationships between declining photosynthetic
  203. quantum yield during senescence and declining
  204. k
  205. leaf
  206. and K
  207. stem
  208. were compared.
  209. • Divergent patterns were observed in the response of K
  210. stem
  211. to seasonal drying;
  212. however, the behaviour of
  213. k
  214. leaf
  215. was essentially similar in both species. Large (five- to
  216. ten-fold) decreases in leaf hydraulic conductance occurred before, and during the
  217. later stages of leaf senescence. During senescence, declining
  218. k
  219. leaf
  220. , which continued
  221. until leaves were ultimately shed, was associated with a concomitant decline in
  222. quantum yield.
  223. • We conclude that, in these species, the loss of hydraulic conductance of the leaf
  224. vascular system is linked to, and possibly responsible for, the loss of photosynthetic
  225. capacity during leaf senescence." name="DC.description" />
  226. <meta content="2003" name="DC.date" />
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  339.     <h1 class="ep_tm_pagetitle">Changes in leaf hydraulic conductance during leaf shedding in seasonally dry tropical forest</h1>
  340.     <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> (2003) <xhtml:em>Changes in leaf hydraulic conductance during leaf shedding in seasonally dry tropical forest.</xhtml:em> New Phytologist, 158 . pp. 295-303. ISSN 0028-646X</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/2598/1/new_phyt_2003.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/2598/1/new_phyt_2003.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />345Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="3406" 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/10.1046/j.1469-8137.2003.00736.x">http://dx.doi.org/10.1046/j.1469-8137.2003.00736.x</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">• The hydraulic conductance of leaves (&#13;
  341. k&#13;
  342. leaf&#13;
  343. ) was examined to determine whether&#13;
  344. this little understood component of the water transport pathway plays a role&#13;
  345. in governing leaf phenology of two deciduous dry forest trees (&#13;
  346. Calycophyllum&#13;
  347. candidissimum&#13;
  348. and&#13;
  349. Rhedera trinervis&#13;
  350. ).&#13;
  351. •&#13;
  352. k&#13;
  353. leaf&#13;
  354. was monitored in parallel with stem hydraulic conductivity (K&#13;
  355. stem&#13;
  356. ) during the&#13;
  357. transition from wet to dry season. The relationships between declining photosynthetic&#13;
  358. quantum yield during senescence and declining&#13;
  359. k&#13;
  360. leaf&#13;
  361. and K&#13;
  362. stem&#13;
  363. were compared.&#13;
  364. • Divergent patterns were observed in the response of K&#13;
  365. stem&#13;
  366. to seasonal drying;&#13;
  367. however, the behaviour of&#13;
  368. k&#13;
  369. leaf&#13;
  370. was essentially similar in both species. Large (five- to&#13;
  371. ten-fold) decreases in leaf hydraulic conductance occurred before, and during the&#13;
  372. later stages of leaf senescence. During senescence, declining&#13;
  373. k&#13;
  374. leaf&#13;
  375. , which continued&#13;
  376. until leaves were ultimately shed, was associated with a concomitant decline in&#13;
  377. quantum yield.&#13;
  378. • We conclude that, in these species, the loss of hydraulic conductance of the leaf&#13;
  379. vascular system is linked to, and possibly responsible for, the loss of photosynthetic&#13;
  380. capacity during leaf senescence.</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;
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