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

journal contribution
posted on 2023-05-19, 18:34 authored by Zhang, F-P, Madeline Carins-Murphy, Cardoso, AA, Gregory JordanGregory Jordan, Timothy BrodribbTimothy Brodribb
  • 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 vein and stomatal densities on cell size. Flowers may not conform to this same developmental pattern if they depend on water supplied by the phloem or have high rates of nonstomatal transpiration.
  • We examined the relationships between veins, stomata and epidermal cells in leaves, sepals and petals of 27 angiosperms to determine whether common spacing rules applied to all tissues.
  • Regression analysis found no evidence for different relationships within organ types. Both vein and stomatal densities were strongly associated with epidermal cell size within organs, but, for a given epidermal cell size, petals had fewer veins and stomata than sepals, which had fewer than leaves.
  • Although our data support the concept of common scaling between veins and stomata in leaves and flowers, the large diversity in petal vein density suggests that, in some species, petal veins may be engaged in additional functions, such as the supply of water for high cuticular transpiration or for phloem delivery of water or carbohydrates.
  • Funding

    Australian Research Council

    History

    Publication title

    New Phytologist

    Volume

    219

    Issue

    4

    Pagination

    1224-1234

    ISSN

    1469-8137

    Department/School

    School of Natural Sciences

    Publisher

    Wiley-Blackwell Publishing Ltd.

    Place of publication

    United Kingdom

    Rights statement

    Copyright 2018 The Authors.

    Repository Status

    • Restricted

    Socio-economic Objectives

    Expanding knowledge in the environmental sciences

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      University Of Tasmania

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