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Tomato Phosphate Transporter Genes Are Differentially Regulated in Plant Tissues by Phosphorus1

Chunming Liu2, Umesh S. Muchhal2, Mukatira Uthappa, Andrzej K. Kononowicz, and Kaschandra G. Raghothama*

Department of Horticulture, Purdue University, West Lafayette, Indiana 47907-1165 (C.L., U.S.M., M.U., K.G.R.); and Department of Plant Cytochemistry and Cytogenetics, University of Lodz, 90-237 Lodz, Poland (A.K.K.)

Phosphorus is a major nutrient acquired by roots via high-affinity inorganic phosphate (Pi) transporters. In this paper, we describe the tissue-specific regulation of tomato (Lycopersicon esculentum L.) Pi-transporter genes by Pi. The encoded peptides of the LePT1 and LePT2 genes belong to a family of 12 membrane-spanning domain proteins and show a high degree of sequence identity to known high-affinity Pi transporters. Both genes are highly expressed in roots, although there is some expression of LePT1 in leaves. Their expression is markedly induced by Pi starvation but not by starvation of nitrogen, potassium, or iron. The transcripts are primarily localized in root epidermis under Pi starvation. Accumulation of LePT1 message was also observed in palisade parenchyma cells of Pi-starved leaves. Our data suggest that the epidermally localized Pi transporters may play a significant role in acquiring the nutrient under natural conditions. Divided root-system studies support the hypothesis that signal(s) for the Pi-starvation response may arise internally because of the changes in cellular concentration of phosphorus.

1   This research was funded in part by U.S. Department of Agriculture-National Research Initiative Competitive Grants Program grant no. 94-37100-0834. This is journal paper no. 15,551 of the Purdue University Agricultural Research Program.
2   The first two authors have contributed equally to this paper and their names are listed alphabetically.
*   Corresponding author; e-mail ragu{at}hort.purdue.edu; fax 1-765-494-0391.

Plant Physiol. (1998) 116: 91-99
Copyright Clearance Center:   0032-0889/98/116/0091/09
© 1998 American Society of Plant Physiologists




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