Photosynthetic Characteristics of Portulaca grandiflora, a Succulent C4 Dicot 1: CELLULAR COMPARTMENTATION OF ENZYMES AND ACID METABOLISM

AUTOR(ES)

Ku, Sun-Ben

RESUMO

The succulent, cylindrical leaves of the C4 dicot Portulaca grandiflora possess three distinct green cell types: bundle sheath cells (BSC) in radial arrangement around the vascular bundles; mesophyll cells (MC) in an outer layer adjacent to the BSC; and water storage cells (WSC) in the leaf center. Unlike typical Kranz leaf anatomy, the MC do not surround the bundle sheath tissue but occur only in the area between the bundle sheath and the epidermis. Intercellular localization of photosynthetic enzymes was characterized using protoplasts isolated enzymatically from all three green cell types.

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