Year: 2016

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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Uprooting an abscisic acid paradigm: Shoots are the primary source

In the past, a conventional wisdom has been that abscisic acid (ABA) is a xylem-transported hormone that is synthesized in the roots, while acting in the shoot to close stomata in response to a decrease in plant water…

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Transport efficiency through uniformity: Organization of veins and stomata in angiosperm leaves

Summary Leaves of vascular plants use specific tissues to irrigate the lamina (veins) and to regulate water loss (stomata), to approach homeostasis in leaf hydration during photosynthesis. As both tissues come with attendant costs, it would be expected…

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Significant contribution from foliage-derived ABA in regulating gas exchange in Pinus radiata

The complex regulatory system controlling stomata involves physical and chemical signals that affect guard cell turgor to bring about changes in stomatal conductance (gs). Abscisic acid (ABA) closes stomata, yet the mechanisms controlling foliar ABA status in tree…

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Abscisic acid controlled sex before transpiration in vascular plants

Sexual reproduction in animals and plants shares common elements, including sperm and egg production, but unlike animals, little is known about the regulatory pathways that determine the sex of plants. Here we use mutants and gene silencing in…

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Revealing catastrophic failure of leaf networks under stress

The intricate patterns of veins that adorn the leaves of land plants are among the most important networks in biology. Water flows in these leaf irrigation networks under tension and is vulnerable to embolism- forming cavitations, which cut…

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Cell expansion not cell differentiation predominantly co-ordinates veins and stomata within and among herbs and woody angiosperms grown under sun and shade

Carins Murphy, MR, Jordan, GJ, Brodribb TJ (2016) Cell expansion not cell differentiation predominantly co-ordinates veins and stomata within and among herbs and woody angiosperms grown under sun and shade. Annals of Botany doi:10.1093/aob/mcw167

Background and aims: It has been proposed that modification of leaf size, driven by epidermal cell size, balances leaf water supply (determined by veins) with transpirational demand (generated by stomata) during acclimation to local irradiance. We aimed to…

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

Md. HasanuzzamanA,C, Lana ShabalaA, Tim J. BrodribbB, Meixue ZhouA and Sergey Shabala (2016) Assessing the suitability of various screening methods as a proxy for drought tolerance in barley. Functional Plant Biology http://dx.doi.org/10.1071/FP16263

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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Towards understanding the fossil record better: Insights from recently deposited plant macrofossils in a sclerophyll-dominated subalpine environment

Towards understanding the fossil record better: Insights from recently deposited plant macrofossils in a sclerophyll-dominated subalpine environment GA Astorga, GJ Jordan, T Brodribb - Review of Palaeobotany and Palynology, 2016

Accumulations of plant macrofossils in lake sediments and other sedimentary deposits are increasingly being used to refine our understanding of past vegetation history, ecological processes and related climate conditions. However, past vegetation studies based on the use of…

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