Research Area: Stomatal Function and Evolution

Guard cells in fern stomata are connected by plasmodesmata, but control cytosolic Ca2+ levels autonomously

Voss, L. J., McAdam, S. A., Knoblauch, M. , Rathje, J. M., Brodribb, T. , Hedrich, R. and Roelfsema, M. R. (2018), Guard cells in fern stomata are connected by plasmodesmata, but control cytosolic Ca2+ levels autonomously. New Phytol, 219: 206-215. doi:10.1111/nph.15153

Recent studies have revealed that some responses of fern stomata to environmental signals differ from those of their relatives in seed plants. However, it is unknown whether the biophysical properties of guard cells differ fundamentally between species of…

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What are the evolutionary origins of stomatal responses to abscisic acid in land plants?

The evolution of active stomatal closure in response to leaf water deficit, mediated by the hormone abscisic acid (ABA), has been the subject of recent debate. Two different models for the timing of the evolution of this response…

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Small Pores with a Big Impact

Small Pores with a Big Impact Michael R. Blatt, Tim J. Brodribb, Keiko U. Torii Plant Physiology Jun 2017, 174 (2) 467-469; DOI: 10.1104/pp.17.00642

This Focus Issue on Stomata is the first dedicated to the evolution, development, and physiology of guard cells, their fundamental relevance to plants and to society. Several reviews and articles in this Focus Issue center around stomata as…

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Amphistomatic leaf surfaces independently regulate gas exchange in response to variations in evaporative demand

Freya Richardson, Timothy J. Brodribb, Gregory J. Jordan; Amphistomatic leaf surfaces independently regulate gas exchange in response to variations in evaporative demand, Tree Physiology, Volume 37, Issue 7, 1 July 2017, Pages 869–878, https://doi.org/10.1093/treephys/tpx073

The occurrence of amphistomatic leaves (stomata on both surfaces) versus hypostomatic leaves (stomata limited to the lower or abaxial surface) has strong associations with environment. Amphistomy provides the advantage of higher conductance of CO2 for photosynthesis, however, unless…

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Does ozone increase ABA levels by non‐enzymatic synthesis causing stomata to close?

McAdam EL, Brodribb TJ, McAdam SAM (2017)Does ozone increase ABA levels by non‐enzymatic synthesis causing stomata to close? Plant, Cell and Environment 40: 741-747

Reactive oxygen species (ROS) are widely recognized as important regulators of stomatal aperture and plant gas exchange. The pathways through which stomata perceive ROS share many commonlinkages with the well characterized signalling pathway for the hormone abscisic acid…

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What are the evolutionary origins of stomatal responses to abscisic acid in land plants?

Sussmilch, FC, Brodribb, TJ, McAdam, SAM (2017) What are the evolutionary origins of stomatal responses to abscisic acid in land plants? Journal of Integrative Plant Biology 59: 240-260

The evolution of active stomatal closure in response to leaf water deficit, mediated by the hormone abscisic acid (ABA), has been the subject of recent debate. Two different models for the timing of the evolution of this response…

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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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Up-regulation of NCED3 and ABA biosynthesis occur within minutes of a decrease in leaf turgor but AHK1 is not required.

Sussmilch, FC, Brodribb, TJ, McAdam, SAM (2017) Up-regulation of NCED3 and ABA biosynthesis occur within minutes of a decrease in leaf turgor but AHK1 is not required. Journal of Experimental Botany doi:10.1093/jxb/erx124

A major environmental signal influencing day-time stomatal aperture is the vapour pressure deficit between the leaf and atmosphere (VPD). In angiosperms, increased VPD triggers biosynthesis of abscisic acid (ABA), prompting rapid stomatal closure. Altered cell turgor has been…

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Xylem and Stomata, Coordinated Through Time and Space

Land plants exhibit a degree of homeostasis in leaf water content to protect against damage to photosynthetic and xylem tissues, and to maintain an efficient allocation of resources. This is achieved by a strong coordination between the systems…

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Weak co-ordination between vein and stomatal densities in 105 angiosperm tree species along altitudinal gradients in Southwest China

Leaf-level water balance, as revealed by a correlation between stomatal density (SD) and vein density (VD), has been reported in some plants. However, the generality of this correlation and how it may be affected by altitude changes are…

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