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Plant Physiology 58:345-349 (1976)
© 1976 American Society of Plant Biologists

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Articles

Comparative Studies of the Thylakoid Proteins of Mesophyll and Bundle Sheath Plastids of Zea mays1

Stefan J. Kirchanski2 and Roderic B. Park

a Department of Botany, University of California, Berkeley, Berkeley, California 94720

The proteins from both grana and stroma lamellae of maize (Zea mays) mesophyll plastids and from maize bundle sheath plastid membranes have been compared by electrophoresis in sodium dodecyl sulfate-polyacrylamide gels using a discontinuous buffer system. Peptide differences between grana and stroma lamellae were essentially quantitative and not qualitative. Bundle sheath plastid membrane peptides more closely resembled those of the ultrastructurally similar stroma lamellae. However, bundle sheath membranes contained several peptides not apparent in the stroma lamellae.

The unappressed membranes (stroma lamellae and bundle sheath plastid membranes) were enriched in heavy (60-40 kilodaltons) peptides and depleted in light (31-20 kilodaltons) peptides as compared to stacked grana membranes. The heavier peptides were tentatively identified as subunits of chloroplast coupling factor. These peptides in unappressed membranes were much more resistant to removal by washing with ethylenediaminetetraacetate (under conditions of low ionic strength) than they were in granal membranes.

Ribulose-1,5-diphosphate carboxylase was identified on the gels and was localized exclusively in the bundle sheath cells. It is suggested that sodium dodecyl sulfate electrophoresis is a simple method to test for the localization of carboxylase in various C4 plastid fractions.

2 Present address: Department of Botany, The University of Texas, Austin, Texas 78712.

1 This research was supported by a Chancellor's Patent Grant from the University of California. Supported in part by a National Science Foundation graduate fellowship to S. J. K.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1976 by the American Society of Plant Biologists