Anomalous vascular bundle sheath structure in Alloteropsis semialata leaf blades

Anomalous vascular bundle sheath structure in Alloteropsis semialata leaf blades

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Alloteropsis semialata (R.Br.) Hitchc.of the Paniceae, would be expected to exhibit typical eupanicoid leaf anatomy with a single cassis crista bundle sheath of large parenchymatous cells with specialized chloroplasts and radially-arranged chlorenchyma.Specimens from South Africa showed the following bundle-sheath and mesophyll deviations from the generalized panicoid model: 1.

bundle sheath is double; 2.inner bundle sheath is composed of large cells with specialized chloroplasts; 3.outer sheath consists of many smaller cells with few, or without 70 x 70 tablecloth chloroplasts; 4.outline of the third- order bundles is tall and narrow; 5.chlorenchyma is not radially arranged.

Other specimens of A.semialata, however, were found to have a large-celled outer bundle sheath devoid of chloroplasts and with indistinctly radiate chlorenchyma.