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    The Influence of Epidermal Windows on the Light Environment Within the Leaves of Six Succulents

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    Issue Date
    2008
    Author
    Egbert, Kathryn J.
    Martin, Craig E.
    Vogelmann, Thomas C.
    Publisher
    Oxford University Press
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
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    Abstract
    An omni-directional fibre optic microprobe was used to measure the quantity and quality of light within the leaves of six succulents having epidermal windows, three species having a subterranean growth habit (Haworthia truncata, Lithops olivacea, and Opthalmophyllum longum) and three growing above ground (Peperomia dolabriformis, P. graveolens, and the sprawling vine Senecio rowleyanus). Although light levels at most locations inside the leaves of all species were high, near those incident on the window surfaces, light levels inside the leaves of the two species of Peperomia often greatly exceeded incident light levels, indicating considerable light scattering and focusing by the leaf tissue. The spectral quality of light inside the leaves of all taxa reflected the absorption properties of chlorophyll, with most of the photons in the green wavelengths. Light quality and quantity inside the leaves did not correlate with the growth habit of the plants, the size of the window (as a proportion of the total leaf area), or location inside the leaf, although light levels generally declined and wavelengths increased deeper in the leaves. Application of reflective tape to the windows reduced internal light levels in L. olivacea and S. rowleyanus, although reductions were not always statistically significant. Although light levels throughout the leaves of P. graveolens were substantially and significantly reduced as a result of the application of reflective tape to its windows, the light levels even at the basal chlorenchyma on the abaxial side of the leaf remained high. In all species investigated, the levels of near-infrared radiation inside the leaves were surprisingly high, yet also declined deeper inside the succulent leaves. This nearinfrared radiation may add to the heat load of these * To whom correspondence should be addressed. E-mail: ecophys@ku.edu plants. Furthermore, application of reflective tape to the windows also reduced the amount of near-infrared radiation inside the leaves of the three succulents examined. These results led to a novel, testable hypothesis that may help to explain previous findings that application of reflective tape to the windows of the leaves of these succulents did not effect a reduction in photosynthetic activity.
    Description
    This is the publisher's official version. It is also available electronically from: http://dx.doi.org/10.1093/jxb/ern105.
    URI
    http://hdl.handle.net/1808/9902
    DOI
    https://doi.org/10.1093/jxb/ern105
    Collections
    • Ecology & Evolutionary Biology Scholarly Works [1516]
    Citation
    Egbert, K.J., C. E. Martin, and T.C. Vogelmann. 2008. The influence of epidermal windows on the light environment within the leaves of six succulents. J. Exp. Bot. 59:1863-1873. http://dx.doi.org/10.1093/jxb/ern105

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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