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Climate drives vein anatomy in Proteaceae


Jordan, GJ and Brodribb, TJ and Blackman, CJ and Weston, PH, Climate drives vein anatomy in Proteaceae, American Journal of Botany, 100, (8) pp. 1483-1493. ISSN 0002-9122 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 Botanical Society of America

DOI: doi:10.3732/ajb.1200471


Premise of study: The mechanisms by which plants tolerate water deficit are only just becoming clear. One key factor in drought tolerance is the ability to maintain the capacity to conduct water through the leaves in conditions of water stress. Recent work has shown that a simple feature of the leaf xylem cells, the cube of the thickness of cell walls divided by the lumen width (t/b/)3), is strongly correlated with this ability.

Methods: Using ecologically, phylogenetically, and anatomically diverse members of Proteaceae, we tested the relationships between (t/b/)3) and climate, leaf mass per unit area, leaf area, and vein density. To test relationships at high phylogenetic levels (mostly genus), we used phylogenetic and nonphylogenetic single and multiple regressions based on data from 50 species. We also used 14 within-genus species pairs to test for relationships at lower phylogenetic levels.

Key results: All analyses revealed that climate, especially mean annual precipitation, was the best predictor of (t/b/)3). The variation in (t/b/)3) was driven by variation in both lumen diameter and wall thickness, implying active control of these dimensions. Total vein density was weakly related to (t/b/)3) but unrelated to either leaf area or climate.

Conclusions: We conclude that xylem reinforcement is a fundamental adaptation for water stress tolerance and, among evergreen woody plants, drives a strong association between rainfall and xylem anatomy. The strong association between (t/b/)3) and climate cannot be explained by autocorrelation with other aspects of leaf form and anatomy that vary along precipitation gradients.

Item Details

Item Type:Refereed Article
Keywords:anatomy, climate, collapse, hydraulic vulnerability, Proteaceae, vein density, xeromorphy, xylem, drought
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
UTAS Author:Jordan, GJ (Professor Greg Jordan)
UTAS Author:Brodribb, TJ (Professor Tim Brodribb)
UTAS Author:Blackman, CJ (Dr Christopher Blackman)
ID Code:88848
Year Published:2013
Funding Support:Australian Research Council (FT100100237)
Web of Science® Times Cited:24
Deposited By:Plant Science
Deposited On:2014-02-18
Last Modified:2014-08-06

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