Journal: Plant Physiology

Mesophyll cells are the main site of abscisic acid biosynthesis in water-stressed leaves

The hormone abscisic acid (ABA) plays a critical role in enhancing plant survival during water deficit. Recent molecular evidence suggests that ABA is synthesized in the phloem companion cells and guard cells. However, the nature of cell turgor…

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Optical Measurement of Stem Xylem Vulnerability

Timothy John Brodribb, Marc Carriqui, Sylvain Delzon, Christopher Lucani (2017) Optical Measurement os Stem Xylem Vulnerability. Plant Physiology Jul 2017, pp.00552.2017; DOI: 10.1104/pp.17.00552

The vulnerability of plant water transport tissues to a loss of function by cavitation during water stress is a key indicator of the survival capabilities of plant species during drought. Quantifying this important metric has been greatly advanced…

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Linking auxin with photosynthetic rate via leaf venation

Scott A M McAdam, Morgane P Eléouët, Melanie Best, Timothy John Brodribb, Madeline Rose Carins Murphy, Sam David Cook, Marion Dalmais, Theodore Dimitriou, Ariane Gelinas-Marion, Warwick M Gill, Matthew Hegarty, Julie M.I. Hofer, Mary Maconochie, Erin L McAdam, Peter McGuiness, David S Nichols, John J. Ross, Frances C. Sussmilch, Shelley Urquhart (2017) Linking auxin with photosynthetic rate via leaf venation. Plant Physiology DOI: https://doi.org/10.1104/pp.17.00535

Land plants lose vast quantities of water to the atmosphere during photosynthetic gas exchange. In angiosperms a complex network of veins irrigates the leaf, and it is widely held that the density and placement of these veins determines…

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An integrated hydraulic-hormonal model of conifer stomata predicts water stress dynamics

Deans, RM, Brodribb, TJ, McAdam, SAM (2017) An integrated hydraulic-hormonal model of conifer stomata predicts water stress dynamics. Plant Physiology DOI:10.1104/pp.17.00150

A simple model combining leaf hydraulics and abscisic acid 23 sensitivity can predict stomatal dynamics to short-term changes in plant water status in a conifer.

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Evolution of the stomatal regulation of plant water content

Brodribb, TJ, McAdam, SAM (2017) Evolution of the stomatal regulation of plant water content. Plant Physiology doi: 10.1104/pp.17.00078

Terrestrial productivity today is regulated by stomatal movements, but this has only been the case 7 since “stomatophytes” became dominant on the land 390 million years ago. In this review we 8 examine evidence for the function of…

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Linking turgor with ABA biosynthesis: implications for stomatal responses to vapour pressure deficit across land plants

SAM McAdam, TJ Brodribb (2016) Linking turgor with ABA biosynthesis: implications for stomatal responses to vapour pressure deficit across land plants. Plant physiology, DOI:10.1104/pp.16.00380

Stomatal responses to changes in vapour pressure deficit (VPD) constitute the predominant form of daytime gas exchange regulation in plants. Stomatal closure in response to increased VPD is driven by the rapid up-regulation of foliar ABA biosynthesis and…

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Evidence that chlorinated auxin is restricted to the Fabaceae but not to the Fabeae

HK Lam, SAM McAdam, EL McAdam, and JJ Ross. Evidence That Chlorinated Auxin Is Restricted to the Fabaceae But Not to the Fabeae. Plant Physiol. 2015 168: 798-803. doi:10.1104/pp.15.00410

Auxin is a pivotal plant hormone, usually occurring in the form of indole-3-acetic acid (IAA). However, in maturing pea (Pisum sativum) seeds, the level of the chlorinated auxin, 4-chloroindole-3-acetic acid (4-Cl-IAA), greatly exceeds that of IAA. A key…

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Bringing Anatomy Back into the Equation

Brodribb TJ. Bringing anatomy back into the equation. Plant Physiology 168: 1461

There is more than metaphorical appeal to the thought that humanity feeds off the sweat of vascular plants. This statement has factual grounds in the sense that plant water loss by transpiration is an inevitable companion to the…

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Extreme aridity pushes trees to their physical limits

Larter M, Brodribb TJ, Pfautsch S, Burlett R, Cochard H, Delzon S. Exreme Aridity Pushes Trees to their Physical Limits. Plant Physiology 168: 804-807

Drought-induced hydraulic failure is a leading cause of mortality of trees (McDowell et al., 2008; Anderegg et al., 2012) and has become a major concern in light of future climate predictions, with forests across the world showing signs of…

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The evolution of mechanisms driving the stomatal response to vapor pressure deficit

McAdam SAM, Brodribb TJ. The Evolution of Mechanisms Driving the Stomatal Response to Vapor Pressure Deficit. Plant Physiology 167: 833-843

Stomatal responses to vapor pressure deficit (VPD) are a principal means by which vascular land plants regulate daytime transpiration. While much work has focused on characterizing and modeling this response, there remains no consensus as to the mechanism…

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