Research Area: Water Stress Impacts

Xylem cavitation isolates leaky flowers during water stress in pyrethrum

Flowers underpin plant evolution, genetic legacy and global food supply. They are exposed to similar evaporative conditions as leaves, yet floral physiology is a product of different selective forces. We used Tanacetum cinerariifolium, a perennial daisy, to examine the…

Advanced vascular function discovered in a widespread moss

The evolution of terrestrial plants capable of growing upwards into the dry atmosphere profoundly transformed the Earth. A transition from small, ‘non-vascular’ bryophytes to arborescent vascular plants during the Devonian period is partially attributed to the evolutionary innovation…

Declining root water transport drives stomatal closure in olive under moderate water stress

Efficient water transport from soil to leaves sustains stomatal opening and steady‐state photosynthesis. The aboveground portion of this pathway is well‐described, yet the roots and their connection with the soil are still poorly understood due to technical limitations….

Hanging by a thread? Forests and drought

Trees are the living foundations on which most terrestrial biodiversity is built. Central to the success of trees are their woody bodies, which connect their elevated photosynthetic canopies with the essential belowground activities of water and nutrient acquisition….

Neither xylem collapse, cavitation, or changing leaf conductance drive stomatal closure in wheat

Identifying the drivers of stomatal closure and leaf damage during stress in grasses is a critical prerequisite for understanding crop resilience. Here, we investigated whether changes in stomatal conductance (gs) during dehydration were associated with changes in leaf…

Factors determining stomatal and non-stomatal (residual) transpiration and their contribution towards salinity tolerance in contrasting barley genotypes

Eighty barley (Hordeum vulgare L.) genotypes of different geographical origin and contrasting in salinity stress tolerance were grown under glasshouse conditions and exposed to high salinity stress (300 mM NaCl) for four weeks to investigate the relationship between leaf gas…

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Residual transpiration as a component of salinity stress tolerance mechanism: a case study for barley

Residual transpiration as a component of salinity stress tolerance mechanism: a case study for barley Md. Hasanuzzaman, Noel W. Davies, Lana Shabala, Meixue Zhou, Tim J. Brodribb and Sergey Shabala https://doi.org/10.1186/s12870-017-1054-y

Background: While most water loss from leaf surfaces occurs via stomata, part of this loss also occurs through the leaf cuticle, even when the stomata are fully closed. This component, termed residual transpiration, dominates during the night and…

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Assessing the suitability of various screening methods as a proxy for drought tolerance in barley

Hasanuzzaman. Md, Shabala. L, Brodribb. TJ, Zhou. M, Shabala. S (2017) Assessing the suitability of various screening methods as a proxy for drought tolerance in barley. Functional Plant Biology 44:253-266

Plant breeders are in the need for a convenient, reproducible, reliable and rapid screening methods to be used as a proxy for drought tolerance for a large number of genotypes. Addressing this need, we compared different physiological measures…

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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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Are flowers vulnerable to xylem cavitation during drought?

Zhang F-P, Brodribb TJ (2017) Are flowers vulnerable to xylem cavitation during drought? Proc. R. Soc. B 284:20162642. http://dx.doi.org/10.1098/rspb.2016.2642

Water stress is known to cause xylem cavitation in the leaves, roots and stems of plants, but little is known about the vulnerability of flowers to xylem damage during drought. This is an important gap in our understanding…

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