Publications by Gregory Jordan

Similar geometric rules govern the distribution of veins and stomata in petals, sepals and leaves

Zhang, F. , Carins Murphy, M. R., Cardoso, A. A., Jordan, G. J. and Brodribb, T. J. (2018), Similar geometric rules govern the distribution of veins and stomata in petals, sepals and leaves. New Phytol. . doi:10.1111/nph.15210

Investment in leaf veins (supplying xylem water) is balanced by stomatal abundance, such that sufficient water transport is provided for stomata to remain open when soil water is abundant. This coordination is mediated by a common dependence of…

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Ferns are less dependent on passive dilution by cell expansion to coordinate leaf vein and stomatal spacing than angiosperms

Ferns are less dependent on passive dilution by cell expansion to coordinate leaf vein and stomatal spacing than angiosperms Carins Murphy MR, Jordan GJ, Brodribb TJ (2017) Ferns are less dependent on passive dilution by cell expansion to coordinate leaf vein and stomatal spacing than angiosperms. PLOS ONE 12(9): e0185648. https://doi.org/10.1371/journal.pone.0185648

Producing leaves with closely spaced veins is a key innovation linked to high rates of photo- synthesis in angiosperms. A close geometric link between veins and stomata in angio- sperms ensures that investment in enhanced venous water transport…

Vein density is independent of epidermal cell size in Arabidopsis mutants

Carins Murphy Madeline R., Dow Graham J., Jordan Gregory J., Brodribb Timothy J. (2017) Vein density is independent of epidermal cell size in Arabidopsis mutants. Functional Plant Biology 44, 410-418.

Densities of leaf minor veins and stomata are co-ordinated within and across vascular plants. This maximises the benefit-to-cost ratio of leaf construction by ensuring stomata receive the minimum amount of water required to maintain optimal aperture. A ‘passive…

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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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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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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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Environmental adaptation in stomatal size independent of the effects of genome size

Jordan, G. J., Carpenter, R. J., Koutoulis, A., Price, A. and Brodribb, T. J. (2015), Environmental adaptation in stomatal size independent of the effects of genome size. New Phytol, 205: 608–617. doi:10.1111/nph.13076

Summary Cell sizes are linked across multiple tissues, including stomata, and this variation is closely correlated with genome size. These associations raise the question of whether generic changes in cell size cause suboptimal changes in stomata, requiring subsequent…

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Using fossil leaves as evidence for open vegetation

Gregory J. Jordan, Raymond J. Carpenter, Timothy J. Brodribb, Using fossil leaves as evidence for open vegetation, Palaeogeography, Palaeoclimatology, Palaeoecology, Volume 395, 1 February 2014, Pages 168-175, ISSN 0031-0182, http://dx.doi.org/10.1016/j.palaeo.2013.12.035.

The ability to discriminate between open vegetation and closed forest in the fossil record is constrained by a paucity of suitable proxies. Taxonomy-based proxies (especially the floristic composition of fossil pollen assemblages) provide the main tool for inferring…

Paleo-Antarctic rainforest into the modern Old World tropics: The rich past and threatened future of the “southern wet forest survivors”

ABSTRACT • Premise of study: Have Gondwanan rainforest floral associations survived? Where do they occur today? Have they survived continuously in particular locations? How significant is their living floristic signal? We revisit these classic questions in light of significant recent…

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Conifer species adapt to low-rainfall climates by following one of two divergent pathways

doi/10.1073/pnas.1407930111

Water stress is one of the primary selective forces in plant evolution. There are characters often cited as adaptations to water stress, but links between the function of these traits and adaptation to drying climates are tenuous. Here…

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