Photosynthetic characteristics of Cashew trees
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1991
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Net photosynthetic rate (PN) and related characters were measured in field grown Anacardium occidentale L. trees. PN could be measured after eight days of ontogeny and reached maximum levels after completion of leaf expansion. There was no significant difference in PN at various leaf positions of a single flush. PN was much lower in the shaded leaves than in the sunlit ones. PN was linearly related with stomatal conductance and transpiration rate. These results and the high saturation irradiance (1200-1400 μmol m-2 s-1) indicated that competition for radiant energy was more important that any other single environmental variable for the cashew photosynthetic capacity. The CO2 compensation concentration was between 80 and 100 cm3 m-3, and the ratio of internal and external CO2 concentrations, Ci/Ca of 0.80-0.86 indicated the C3 nature of cashew trees.
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Photosynthetica 25(3); 419-423, 1991