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Plant Physiol, January 2002, Vol. 128, pp. 140-149

Differential Regulation of Transcripts Encoding Cytosolic NADP-Malic Enzyme in C3 and C4 Flaveria Species1

Lien B. Lai,2 S. Lorraine Tausta, and Timothy M. Nelson*

Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, Connecticut 06520-8104

A cytosolic NADP-malic enzyme (CYTME) has been described previously in several plants, all C3 species. CYTME is distinct from the chloroplastic NADP-malic enzyme (CHLME) that is highly active in C4 species. We show that at least one CytMe gene is present in all Flaveria spp., including C3, C4, and C3-C4 intermediate types. Based on the CytMe expression patterns in Flaveria pringlei (C3) and Flaveria trinervia (C4), we suggest CYTME has several distinct roles, including the supplying of NADPH for cytosolic metabolism, the supporting of wound response or repair, and the balancing of cellular pH in illuminated leaves. These three roles are likely correlated with CytMe mRNAs of apparent sizes 2.0, 2.2, and 2.4 kb, respectively, which differ in the length of the 5' untranslated regions. Various regulatory mechanisms involving RNA processing and translational efficiency are discussed.

1 This work was supported by the Department of Energy (grant no. DE-FG02-91ER20038 to T.M.N.).

2 Present address: Department of Plant Biology, The Ohio State University, Columbus, OH 43210-1293.

* Corresponding author; e-mail timothy.nelson{at}yale.edu; fax 203-432-5632.

© 2002 American Society of Plant Physiologists


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