Please use this identifier to cite or link to this item: https://doi.org/10.1007/s11099-010-0007-6
Title: The photosynthetic pathway of the roots of twelve epiphytic orchids with CAM leaves
Authors: Martin, C.E.
Mas, E.J.
Lu, C.
Ong, B.L. 
Keywords: δ13C/12C
Chlorophyll
CO2 exchange
Velamen
Issue Date: Mar-2010
Citation: Martin, C.E., Mas, E.J., Lu, C., Ong, B.L. (2010-03). The photosynthetic pathway of the roots of twelve epiphytic orchids with CAM leaves. Photosynthetica 48 (1) : 42-50. ScholarBank@NUS Repository. https://doi.org/10.1007/s11099-010-0007-6
Abstract: The photosynthetic pathway of the roots (both the white velamentous main portions and the green, nonvelamentous tips) was investigated in twelve taxa (natural species and intergeneric hybrid cultivars) of epiphytic orchids having CAM leaves. All organs contained chlorophyll, and the a/b ratios indicate that the organs, especially the roots, are likely shade-adapted. Stable carbon isotope ratios of the tissues were near -15‰ for all organs, a value typical of obligate (constitutive) CAM plants. Values for root tissues were slightly lower (more negative) than those of the leaves. The presence of CAM in the leaves of these orchids did not ensure that their roots performed CAM photosynthesis. Further work is needed to address the questions raised in this study and to determine if the photosynthetic roots of these taxa are capable of assimilating atmospheric CO2. © 2010 Springer Science+Business Media B.V.
Source Title: Photosynthetica
URI: http://scholarbank.nus.edu.sg/handle/10635/101981
ISSN: 03003604
DOI: 10.1007/s11099-010-0007-6
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