Abstract
A comparative study of some stomatal characteristics and transpirational rates of several C4 and C3 dicotyledonous plants was made. Among the plants studied, C4 species had higher stomatal frequency in upper leaf surfaces (relative to their lower leaf surfaces) than the C3 ones. The maximal stomatal opening was at 12 noon in C4 plants but at 10 AM in C3 plants. C4 plants had lower stomatal conductance and and higher water-use efficiency than C3 plants.
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