• The hydraulic plumbing of vascular plant leaves varies considerably between major plant groups both in the spatial organization of veins, as well as their anatomical structure. • Five conifers, three ferns and 12 angiosperm trees were selected from tropical and temperate forests to investigate whether the profound differences in foliar morphology of these groups lead to correspondingly profound differences in leaf hydraulic efficiency. • We found that angiosperm leaves spanned a range of leaf hydraulic conductance from 3.9 to 36 mmol m 2 s -1 MPa -1, whereas ferns (5.9-11.4 mmol m -2 s -1 MPa -1) and conifers (1.6-9.0 mmol m -2 s -1 MPa -1) were uniformly less conductive to liquid water. Leaf hydraulic conductance (K leaf) correlated strongly with stomatal conductance indicating an internal leaf-level regulation of liquid and vapour conductances. Photosynthetic capacity also increased with K leaf, however, it became saturated at values of K leaf over 20 mmol m -2 s -1 MPa -1. • The data suggest that vessels in the leaves of the angiosperms studied provide them with the flexibility to produce highly conductive leaves with correspondingly high photosynthetic capacities relative to tracheid-bearing species. © New Phytologist (2004).

Item Type:	Refereed Article
Research Division:	Biological Sciences
Research Group:	Plant Biology
Research Field:	Plant Physiology
Objective Division:	Expanding Knowledge
Objective Group:	Expanding Knowledge
Objective Field:	Expanding Knowledge in the Environmental Sciences
Author:	Brodribb, TJ (Professor Tim Brodribb)
ID Code:	38025
Year Published:	2005
Web of Science® Times Cited:	193
Deposited By:	Plant Science
Deposited On:	2005-08-01
Last Modified:	2007-12-04
Downloads:	0