Tagged: vein density


Leaf anatomy

Links between leaf venation and xylem anatomy to leaf hydraulic vulnerability

The structural properties of leaf venation and xylem anatomy strongly influence leaf hydraulics, including the ability of leaves to maintain hydraulic function during drought. Blackman and colleagues examined the strength of the links between different leaf venation traits and leaf hydraulic vulnerability to drought (expressed as P50 leaf by rehydration kinetics) in a diverse group of 26 woody angiosperm species, representing a wide range of leaf vulnerabilities, from four low-nutrient sites with contrasting rainfall across eastern Australia. For each species they measured key aspects of leaf venation design, xylem anatomy and leaf morphology. They also assessed for the first time the...

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Mean stomatal size and stomatal density ± s.d. across species

Cell expansion links leaf veins and stomata

In some woody plants, adjusting leaf size (via epidermal cell size) balances water supply (veins) with transpirational demand (stomata). However, it is unclear whether this is a general pattern among plant species. Carins Murphy et al. compare relationships between vein and stomatal density, epidermal cell size and leaf size in pairs of related herb and woody species from four plant families grown under sun and shade. Correlations between modelled (assuming veins and stomata are passively diluted by epidermal cell expansion) and observed relationships indicate that fluctuations in epidermal cell size constitute a responsive mechanism, by which the plants maintain a...

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Testing models for the leaf economics spectrum with leaf and whole-plant traits in Arabidopsis thaliana

The leaf economics spectrum (LES) is a global set of patterns that describes correlations between functional traits (e.g. carbon assimilation rate, lifespan) that determine terrestrial resource fluxes. Several classes of models have been proposed to explain the LES, but none have been extensively tested against each other with fine-scale data. In a new study published in AoB PLANTS, Blonder et al. assemble a large set of genotypes of Arabidopsis thaliana that show variation in leaf functional traits. They show that no extant theory for the LES is supported, but that some leaf venation networks likely play a role in driving...

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