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Two measures of leaf capacitance: insights into the water transport pathway and hydraulic conductance in leaves

Citation

Blackman, CJ and Brodribb, TJ, Two measures of leaf capacitance: insights into the water transport pathway and hydraulic conductance in leaves, Functional Plant Biology: An International Journal of Plant Function, 38, (2) pp. 118-126. ISSN 1445-4408 (2011) [Refereed Article]


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Copyright Statement

Copyright 2011 CSIRO

DOI: doi:10.1071/FP10183

Abstract

The efficiency and stress tolerance of leaf water transport are key indicators of plant function, but our ability to assess these processes is constrained by gaps in our understanding of the water transport pathway in leaves.Amajor challenge is to understand how different pools of water in leaves are connected to the transpiration stream and, hence, determine leaf capacitance (Cleaf) to short- and medium-term fluctuations in transpiration. Here, we examine variation across an anatomically and phylogenetically diverse group of woody angiosperms in two measures of Cleaf assumed to represent bulk-leaf capacitance (Cbulk) and the capacitance of leaf tissues that influence dynamic changes in leaf hydration (Cdyn). Among species, Cbulk was significantly correlated with leaf mass per unit area, whereas Cdyn was independently related to leaf lignin content (%) and the saturated mass of leaf water per unit dry weight. Dynamic and steady-state measurements of leaf hydraulic conductance (Kleaf) agreed if Cdyn was used rather than Cbulk, suggesting that the leaf tissue in some species is hydraulically compartmentalised and that only a proportion of total leaf water is hydraulically well connected to the transpiration stream. These results indicate that leaf rehydration kinetics can accurately measure Kleaf with knowledge of the capacitance of the hydraulic pathway.

Item Details

Item Type:Refereed Article
Keywords:hydraulic compartmentalisation, leaf dry mass, leaf hydraulic conductance, leaf water content, rehydration kinetics
Research Division:Biological Sciences
Research Group:Evolutionary Biology
Research Field:Biological Adaptation
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Forest and Woodlands Flora, Fauna and Biodiversity
Author:Blackman, CJ (Mr Christopher Blackman)
Author:Brodribb, TJ (Professor Tim Brodribb)
ID Code:71955
Year Published:2011
Web of Science® Times Cited:44
Deposited By:Plant Science
Deposited On:2011-08-16
Last Modified:2012-04-04
Downloads:18 View Download Statistics

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