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    Unusual Water Relations in the CAM Atmospheric Epiphyte Tillandsia Usneoides L. (Bromeliaceae)

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    Martin_BotGaz_150_1-8.pdf (20.53Mb)
    Issue Date
    1989
    Author
    Martin, Craig E.
    Schmitt, Andreas K.
    Publisher
    The University of Chicago
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Published Version
    http://www.jstor.org/stable/2995179
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    Abstract
    Past studies have reported two unusual aspects of the water relations of the atmospheric CAM epiphyte Tillandsia usneoides L. (Bromeliaceae): a drought stimulation of nocturnal C02 uptake, and nocturnal absorption of water vapor. Contrary to past reports, a 10-d drought did not stimulate nocturnal C02 uptake in this species. On the other hand, previous reports of nocturnal water vapor absorption were confirmed in situ throughout a year, although tissue hydration from this source was insufficient to offset daytime water loss. Deposition of dew on the plants was never observed in the field. It is hypothesized that the unusual nature of the water relations of T. usneoides is attributable to the interactions between two "pools" of water and the external atmosphere. The dense indumentum of trichomes obscuring the surface of this epiphyte comprises one pool and is most likely responsible for rapid hydration early in the night and dehydration early in the day. In addition, stomata control water loss from the living mesophyll cells, the second pool, for the remainder of the night. The high rates of water loss observed throughout the day when stomata are closed probably result from leakage through the trichomes.
    Description
    This is the publisher's version, also available electronically from: http://www.jstor.org/stable/2995179.
    URI
    http://hdl.handle.net/1808/9894
    Collections
    • Ecology & Evolutionary Biology Scholarly Works [1516]
    Citation
    Martin, C.E. and A.K. Schmitt. 1989. Unusual water relations in the CAM atmospheric epiphyte Tillandsia usneoides L. (Bromeliaceae). Bot. Gaz. 150: 1-8.

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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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