Influence of differences in leaf anatomy on net photosynthetic rates of some cultivars of Cassava |
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Authors: | Mabrouk A. El-Sharkawy James H. Cock Giovanna de Cadena |
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Affiliation: | (1) The Cassava Physiology Program, Centro Internacional de Agricultura Tropical (CIAT), Apartado Aereo, 6713 Cali, Colombia, SA |
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Abstract: | Gas exchange measurements and leaf anatomy of 10 cassava cultivars were conducted to study the interrelationship between the relatively high photosynthetic rates and the factors limiting internal CO2 diffusion. The internal mesophyll surface area per unit leaf surface area (Ames/A) and the intracellular components of CO2 diffusion and fixation resistance (RcellCO2) were determined. Among the group of cultivars tested net CO2 exchange rates were 26±2.5 mol CO2 m–2 s–1 in normal air and intense light and Ames/A ranged from 14 to 38. Estimated RcellCO2 ranged from 4300 to 13,000 s m–1. The combined and compensating effects of Ames/A and RcellCO2 accounted for both the high net photosynthetic rates (Pn) and the lack of large differences in Pn among cultivars. |
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Keywords: | Cassava (Manihot esculenta Crantz) photosynthetic rate anatomy mesophyll surface area |
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