Do pathways of water movement and leaf anatomical dimensions allow development of gradients in H218O between veins and the sites of evaporation within leaves

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Leaf hydraulics. (2006, background): “A complete understanding of water flow pathways will illuminate several important aspects of leaf function, including the enrichment of oxygen isotopes (6), and the response of stomata to leaf water status.”
Indirect effects of insect herbivory on leaf gas exchange in soybean (2005, background): “Lateral water transport outside vascular tissue can occur simultaneously through unsuberized cell wall spaces (apoplast ) and through the cytosol of nearby cells (symplast; Barbour & Farquhar 2003).”
Stable oxygen isotope composition of plant tissue: a review. (2007, background): “L is not simply related to the physical distance between veins and stomata, but rather is scaled by a tortuousity factor that increases the effective length by at least two orders of magnitude (Barbour and Farquhar 2004).”