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Heterogeneity of Mitochondrial Protein Biogenesis during Primary Leaf Development in Barley1

Peter Thompson, Caroline G. Bowsher, and Alyson K. Tobin*

Plant Science Laboratory, School of Environmental and Evolutionary Biology, Sir Harold Mitchell Building, University of St. Andrews, St. Andrews, Fife KY16 9TH, Scotland (P.T., A.K.T.); and School of Biological Sciences, Stopford 3.614, University of Manchester, Manchester M13 9PT, United Kingdom (C.G.B.)

The natural developmental gradient of light-grown primary leaves of barley (Hordeum vulgare L.) was used to analyze the biogenesis of mitochondrial proteins in relation to the age and physiological changes within the leaf. The data indicate that the protein composition of mitochondria changes markedly during leaf development. Three distinct patterns of protein development were noted: group A proteins, consisting of the E1 beta -subunit of the pyruvate dehydrogenase complex, ORF156, ORF577, alternative oxidase, RPS12, cytochrome oxidase subunits II and III, malic enzyme, and the alpha - and beta -subunits of F1-ATPase; group B proteins, consisting of the E1 alpha -subunit of the pyruvate dehydrogenase complex, isocitrate dehydrogenase, HSP70A, cpn60C, and cpn60B; and group C proteins, consisting of the four subunits of the glycine decarboxylase complex (P, H, T, and L proteins), fumarase, and formate dehydrogenase. All of the proteins increased in concentration from the basal meristem to the end of the elongation zone (20.0 mm from the leaf base), whereupon group A proteins decreased, group B proteins increased to a maximum at 50 mm from the leaf base, and group C proteins increased to a maximum at the leaf tip. This study provides evidence of a marked heterogeneity of mitochondrial protein composition, reflecting a changing function as leaf cells develop photosynthetic and photorespiratory capacity.

1   This work was funded by The Royal Society (University Research Fellowship to A.K.T.; Pickering Research Fellowship to C.G.B.) and by a Biological and Biotechnological Sciences Research Council, Biochemistry of Metabolic Regulation in Plants studentship (to P.T.).
*   Corresponding author; e-mail at6{at}st-andrews.ac.uk; fax 44-1-334-463366.

Plant Physiol. (1998) 118: 1089-1099
Copyright Clearance Center:   0032-0889/98/118//11
© 1998 American Society of Plant Physiologists




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