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ADP-Glucose Pyrophosphorylase Is Localized to Both the Cytoplasm and Plastids in Developing Pericarp of Tomato Fruit1

Bing-Yuan Chen, Yi Wang, and Harry W. Janes*

Department of Plant Science, Rutgers University, New Brunswick, New Jersey 08903 (B.-Y.C., H.W.J.); and Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing, China (Y.W.)

The intracellular location of ADP-glucose pyrophosphorylase (AGP) in developing pericarp of tomato (Lycopersicon esculentum Mill) has been investigated by immunolocalization. With the use of a highly specific anti-tomato fruit AGP antibody, the enzyme was localized in cytoplasm as well as plastids at both the light and electron microscope levels. The immunogold particles in plastids were localized in the stroma and at the surface of the starch granule, whereas those in the cytoplasm occurred in cluster-like patterns. Contrary to the fruit, the labeling in tomato leaf cells occurred exclusively in the chloroplasts. These data demonstrate that AGP is localized to both the cytoplasm and plastids in developing pericarp cells of tomato.

1   This work was supported by the National Aeronautics and Space Administration.
*   Corresponding author; e-mail janes{at}aesop.rutgers.edu; fax 1-908-932-9441.

Plant Physiol. (1998) 116: 101-106
Copyright Clearance Center:   0032-0889/98/116/0101/06
© 1998 American Society of Plant Physiologists




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