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• W2284418622 abstract "The question of how water supply and water loss-adhibited structures integrate in leaves to perform a complex mediation among plant different necessities, and its evolutive implications, has been almost neglected so far.Hydraulic resistance in leaves accounts for 30% of the total resistance of the plant to water transport (Sack and Holbrook 2006), a dominating component of what being situated within the leaf spongy mesophyll (Cochard, Nardini, and Coll 2004). Only few recent works have identified the length of the water path from veins to evaporating sites as a limiting factor to the transpiration performances of plants (Brodribb, Feild, and Jordan 2007; Brodribb, Feild, and Sack 2010). By estimating the proximity between veins and stomata with the inverse value of vein density, an explaination for angiosperms highest photosynthetic capacity among plants has been found in their superior vein density values (Boyce et al. 2009).In this dissertation I examined how the spatial arrangements of stomata and veins coordinate in two philogenetically and morphologically diverse groups of both angiosperms and ferns. By sampling species spanning the breadth of vein architecture and phylogenetic diversity I sought to understand whether relationships among spatial traits were general or variable among plants of the same group and among groups.A method based on image editing and geoprocessing tools was developed and applied in order to spatially relate stomata and veins position on the leaf. The “elementary unit of lamina completely enclosed by veins” was identified as a loop and three new functional traits linking veins and stomata (stomata density per loop lamina, stomata density per loop contour and average minimum distance from stomata to vein walls per loop) were defined. To account for fern branching structures, the definition of loop was then extended to as “the smallest portion of lamina all enclosed by veins and leaf margin”.In Chapter 2 I present the hypothesis underling my work and I describe how GIS tools can be used on leaves microscope images in order to extract spatial data on vein and stomata arrangement.In Chapter 3 I examine a dataset on 32 philogenetically diverse angiosperm species and a gymnosperm. Specifically, I compile average values for each species for the functional traits I previously defined. Then I compare values of stomata density and loop size for different position on the leaf in order to verify or exclude the presence of a spatial gradient and I test for general relationships among the functional and geometrical leaf traits.In Chapter 4 I apply the same methodology to a dataset of 8 diverse fern species.Finally in Chapter 5 the results for the two groups of plants are jointly discussed in an attempt to unify methodology and evolutive physiology.This detailed examination of spatial coordination between stomata and veins in both angiosperm and fern species provides some key insights into the evolutive trends leading to the supremacy of a group of plants on the other" @default.
• W2284418622 created "2016-06-24" @default.
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• W2284418622 date "2013-01-30" @default.
• W2284418622 modified "2023-09-27" @default.
• W2284418622 title "Spatial coordination between veins and stomata links water supply with water loss in leaves" @default.
• W2284418622 hasPublicationYear "2013" @default.
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