C3 and C4 Photosynthetic and Anatomical forms of Alloteropsis semialata (R.Br.) Hitchcock

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Abstract
The grass Alloteropsis semialata (R.Br.) Hitchcock is unique in that both Kranz and non-Kranz leaf anatomy has been reported in this species. The present study investigates Kranz forms of A. semialata collected from a single ecological niche. These plants exhibit morphological and anatomical differences with respect to leaf area, stomatal size and stomatal distribution. Carbon dioxide and water exchange measurements in the two forms show the expected pattern of higher photosynthetic rate and higher water utilization efficiency associated with Kranz anatomy. No intermediate physiological response or anatomical form was observed in this sample.

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