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Metabolism and Enzymology

Localization of Ferredoxin Isoproteins in Mesophyll and Bundle Sheath Cells in Maize Leaf

Department of Agricultural Chemistry, School of Agriculture, Nagoya University, Chikusa, Nagoya 464, Japan

Four ferredoxin isoproteins were identified in the C₄ plant Zea mays L. by analysis of extracts from leaves, mesocotyls, and roots of the young seedlings. The relative amounts of the isoproteins isolated from the photosynthetic and nonphotosynthetic organs were different. All the isoproteins were present in the leaves of green and etiolated plants, whereas two out of the four isoproteins were not detected in the roots or in the mesocotyls. During the greening of etiolated seedlings, the level of the two isoproteins unique to the leaf increased markedly. Analysis of the cellular and subcellular distribution of the two major leaf isoproteins showed that one isoprotein was present in the chloroplasts of both mesophyll and bundle sheath cells, whereas the other was only found in the chloroplasts of bundle sheath cells. This is the first report of the cell-specific expression of ferredoxin isoproteins in the leaves of a C₄ plant.

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