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Leaf Anatomy and CO2 Recycling During Crassulacean Acid Metabolism in Twelve Epiphytic Species of Tillandsia (Bromeliaceae)
Loeschen, Valerie S. Martin, Craig E. Smith, Marian Eder, Suzanne L.
Loeschen, Valerie S.
Martin, Craig E.
Smith, Marian
Eder, Suzanne L.
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Abstract
The relationship between leaf anatomy, specifically the percent of leaf volume occupied by waterstorage
parenchyma (hydrenchyma), and the contribution of respiratory C02 during Crassulacean acid
metabolism (CAM) was investigated in 12 epiphytic species of Tillandsia. It has been postulated that the
hydrenchyma, which contributes to C 0 2 exchange through respiration only, may be causally related to
the recently observed phenomenon of C 0 2 recycling during CAM. Among the 12 species of Tillandsia,
leaves of T. usneoides and T. bergeri exhibited 0% hydrenchyma, while the hydrenchyma in the other
species ranged from 2.9% to 53% of leaf cross-sectional area. Diurnal malate fluctuation and nighttime
atmospheric C 0 2 uptake were measured in at least four individuals of each species. A significant excess
of diurnal malate fluctuation as compared with atmospheric C 0 2 absorbed overnight was observed only
in T. schiedeana. This species had an intermediate proportion (30%) of hydrenchyma in its leaves. Results
of this study do not support the hypothesis that C02 recycling during CAM may reflect respiratory
contributions of C 0 2 from the tissue hydrenchyma.
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This is the publisher's official version. It is also available electronically from: http://www.jstor.org/stable/2995609.
Date
1993
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The University of Chicago Press
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Martin_1993_154.pdf
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Loeschen, V.S., C.E. Martin, M. Smith, and S.L. Eder. 1993. Leaf anatomy and CO2 recycling during Crassulacean acid metabolism in twelve species of Tillandsia (Bromeliaceae). Internat. J. Plant Sci. 154: 100-106.