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Title: Relation of respiration to CO2 fixation by Aranda orchid roots
Authors: Hew, C.S. 
Ye, Q.S.
Pan, R.C.
Issue Date: Jul-1991
Source: Hew, C.S.,Ye, Q.S.,Pan, R.C. (1991-07). Relation of respiration to CO2 fixation by Aranda orchid roots. Environmental and Experimental Botany 31 (3) : 327-331. ScholarBank@NUS Repository.
Abstract: Net CO2 fixation in the light was observed only in freshly harvested Aranda root sections 20 cm or more from the tip at 15°C. No net CO2 fixation was observed at higher temperatures. The rate of CO2 fixation at 350 ppm (15°C) increased with light intensity and became saturated at about 300 μE·m-1·sec-1. The roots evolved CO2 in the light and in the dark when placed in CO2-free air. CO2 evolution in the light did not increase with increasing O2 concentration, and glycolate oxidase activity was not detected in roots. The contribution of photorespiration to CO2 effux in the light was negligible. The absence of net CO2 fixation in the light and in the dark by Aranda orchid roots is attributed to a relatively high rate of dark respiration. The rate of CO2 fixation by the orchid roots can be estimated from the CO2 gas exchange in ambient air vs that in CO2-free air. © 1991.
Source Title: Environmental and Experimental Botany
ISSN: 00988472
Appears in Collections:Staff Publications

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