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    The architecture of New Zealand's divaricate shrubs in relation to light adaptation (2006)

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    12600908_50_Christian NZJBot Div.pdf (434.3Kb)
    Type of Content
    Journal Article
    UC Permalink
    http://hdl.handle.net/10092/5548
    
    Publisher
    University of Canterbury. Biological Sciences
    ISSN
    0028-825X
    Related resource(s)
    http://www.rsnz.org/publish/nzjb/2006/016.php
    Collections
    • Science: Journal Articles [1117]
    Authors
    Christian, R.A.
    Kelly, D.
    Turnbull, M.H.
    show all
    Abstract

    The divaricating shoot habit is typified by a suite of architectural traits, quantified here using phylogenetic independent comparisons of three pairs of congeners, with or without the habit. We consider the hypothesis that the habit evolved as a structural photoprotection mechanism that maximises potential carbon fixation by minimising photoinhibition. Plants were grown in pots in full sun, or behind vertical screens transmitting c. 25, 52, or 73% sunlight. When shaded, all species shifted partitioning of biomass from stem thickening to leaf area expansion and occupied a larger crown volume for a given shoot biomass. Leaf numbers per stem length of divaricates and non-divaricates were greater in the lower and upper canopies, respectively, consistent with the view that in divaricates outer branches protect inner leaves. However, leaf numbers per stem length showed no response to variation in high light receipt. Divaricates showed some traits typical of plants adapted to sunny habitats: smaller effective leaf size, lesser fractional partitioning of biomass to leaves, and greater foliage densities. Other traits of divaricates were typical of plants adapted to shaded habitats: lesser stem diameters, stem biomass per unit stem length, leader dominance, leaf area index, and heights relative to crown diameters; and more horizontal twig orientations. Compensation for high costs of support of photosynthetic area in divaricates (leaf area per unit shoot biomass c. 1.3 m2 kg-1) compared with non-divaricates (c. 5.5 m2 kg-1) would require a larger enhancement of net canopy photosynthesis than is likely to arise from avoidance of photoinhibition.

    Citation
    Christian, R.A., Kelly, D., Turnbull, M.H. (2006) The architecture of New Zealand's divaricate shrubs in relation to light adaptation. New Zealand Journal of Botany, 44, pp. 171-186.
    This citation is automatically generated and may be unreliable. Use as a guide only.
    Keywords
    divaricate; morphological plasticity; penumbra; photoprotection; support costs
    ANZSRC Fields of Research
    07 - Agricultural and Veterinary Sciences::0706 - Horticultural Production::070601 - Horticultural Crop Growth and Development
    06 - Biological Sciences::0607 - Plant Biology::060703 - Plant Developmental and Reproductive Biology
    Rights
    https://hdl.handle.net/10092/17651

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