Non-linear mixed-effects modeling for photosynhetic response of Rosa hybrida L. under elevated CO2 in greenhouses - short communication

I. Ozturk, C.O. Ottosen, Christian Ritz, Jens Carl Streibig

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    Abstract

    Photosynthetic response to light was measured on the leaves of two cultivars of Rosa hybrida L. (Escimo and Mercedes)
    in the greenhouse to obtain light-response curves and their parameters. Th e aim was to use a model to simulate leaf
    photosynthetic carbon gain with respect to environmental conditions. Leaf gas exchanges were measured at 11 light
    intensities from 0 to 1,400 µmol/m2s, at 800 ppm CO2, 25°C, and 65 ± 5% relative humidity. In order to describe the data
    corresponding to diff erent measurement dates, the non-linear mixed-eff ects regression analysis was used. Th e model
    successfully described the photosynthetic responses. Th e analysis indicated signifi cant diff erences in light saturated
    photosynthetic rates and in light compensation points. Th e cultivar with the lower light compensation points (Escimo)
    maintained a higher carbon gain despite its lower (but not-signifi cant) quantum effi ciency. Th e results suggested acclimation
    response, as carbon assimilation rates and stomatal conductance at each measurement date were higher for
    Escimo than Mercedes. Diff erences in photosynthesis rates were attributed to the adaptive capacity of the cultivars to
    light conditions at a specifi c day when the experiments were undertaken.
    Original languageEnglish
    JournalHorticultural Science
    Volume38
    Issue number1
    Pages (from-to)43-47
    Number of pages5
    ISSN0862-867X
    Publication statusPublished - 2011

    Keywords

    • BRIC
    • miniature rose
    • irradiance
    • response curve
    • carbon assimilation

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