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Effects of Irradiance on Crassulacean Acid Metabolism in the Epiphyte Tillandsia usneoides L. (Bromeliaceae)
Martin, Craig E. Eades, Carol A. Pitner, Renee A.
Martin, Craig E.
Eades, Carol A.
Pitner, Renee A.
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Abstract
Spanish moss (Tillandsia usneoides L.) was collected in South Carolina,
maintained in a greenhouse, then exposed to five levels of photosynthetic
photon flux density (PPFD) for 3 weeks. Following this treatment,
plants were sampled for chlorophyll concentrations, nocturnal acid accumulations,
and photosynthetic responses to subsequent exposure at a
range of PPFD. No acclimation to PPFD was observed; all plants
exhibited similar patterns of nocturnal C02 uptake and acid accumulation
regardless of initial PPFD treatment. These patterns revealed that at a
PPFD level of approximately 200 micromoles per square meter per
second (daytime integrated PPFD of 10 moles per square meter per day),
CAM saturated or, in low-PPFD plants, was optimal. The results of this
study indicate that adaptation to high PPFD is not necessarily a requirement
of CAM.
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This is the publisher's version, also electronically available from: http://www.plantphysiol.org/content/80/1/23.full.pdf+html.
Date
1986
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American Society of Plant Biologists
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Martin, C.E., C.A. Eades, and R.A. Pitner. 1986. Effects of irradiance on Crassulacean acid metabolism in the epiphyte Tillandsia usneoides L. (Bromeliaceae). Plant Physiol. 80: 23-26.