Year: 2015

Physicochemical Quantification of Abscisic Acid Levels in Plant Tissues with an Added Internal Standard by Ultra-Performance Liquid Chromatography

McAdam, S. A. (2015). Physicochemical Quantification of Abscisic Acid Levels in Plant Tissues with an Added Internal Standard by Ultra-Performance Liquid Chromatography. Bio-protocol 5(18): e1599. http://www.bio-protocol.org/e1599

The phytohormone abscisic acid (ABA) is critical for a range of plant responses to the environment, most importantly in closing the stomata of seed plants during drought (Mittelheuser and Van Steveninck 1969; Brodribb et al. 2014). The high precision quantification…

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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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Responses to mild water deficit and rewatering differ among secondary metabolites but are similar among provenances within Eucalyptus species

Adam B. McKiernan, Brad M. Potts, Timothy J. Brodribb, Mark J. Hovenden, Noel W. Davies, Scott A.M. McAdam, John J. Ross, Thomas Rodemann, and Julianne M. O'Reilly-Wapstra Responses to mild water deficit and rewatering differ among secondary metabolites but are similar among provenances within Eucalyptus species Tree Physiol first published online October 23, 2015 doi:10.1093/treephys/tpv106

Water deficit associated with drought can severely affect plants and influence ecological interactions involving plant secondary metabolites. We tested the effect of mild water deficit and rewatering on physiological, morphological and chemical traits of juvenile Eucalyptus globulus Labill. and Eucalyptus viminalis Labill….

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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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Evolution in the smallest valves (stomata) guides even the biggest trees

McAdam SAM, Brodribb TJ. Evolution in the Smallest Valves (Stomata) guides even the biggest trees. Tree Physiology 35: 451-452

The regal stature of the redwood sister-giants, Sequoia and Sequoiadendron, makes them internationally renowned icons of size and longevity. Yet an examination of the evolutionary history of the sequoiid clade (which includes the dawn redwood— Metasequoia) quickly dispels…

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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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Hormonal dynamics contributes to divergence in seasonal stomatal behaviour in a monsoonal plant community

MCADAM, S. A.M. and BRODRIBB, T. J. (2015), Hormonal dynamics contributes to divergence in seasonal stomatal behaviour in a monsoonal plant community. Plant Cell Environ, 38: 423–432. doi:10.1111/pce.12398

The plant hormone abscisic acid (ABA) is a primary regulator of plant transpiration, but its influence in determining seasonal stomatal behaviour in natural plant communities is poorly understood. We examined distantly related vascular plants growing together in a…

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Shoot‐derived abscisic acid promotes root growth

McAdam, S. A. M., Brodribb, T. J., and Ross, J. J. (2016) Shoot-derived abscisic acid promotes root growth. Plant, Cell and Environment, 39: 652–659. doi: 10.1111/pce.12669.

The phytohormone abscisic acid (ABA) plays a major role in regulating root growth. Most work to date has investigated the influence of root-sourced ABA on root growth during water stress. Here, we tested whether foliage-derived ABA could be…

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Stomatal responses to vapour pressure deficit are regulated by high speed gene expression in angiosperms

McAdam, S. A. M., Sussmilch, F. C., and Brodribb, T. J. (2016) Stomatal responses to vapour pressure deficit are regulated by high speed gene expression in angiosperms. Plant, Cell & Environment, 39: 485–491. doi: 10.1111/pce.12633.

Plants dynamically regulate water use by the movement of stomata on the surface of leaves. Stomatal responses to changes in vapour pressure deficit (VPD) are the principal regulator of daytime transpiration and water use efficiency in land plants….

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