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THE PLANT CELL, Vol 1, Issue 9 937-943, Copyright © 1989 by American Society of Plant Biologists
Developmentally Regulated Expression of Soybean Proline-Rich Cell Wall Protein Genes
J. C. Hong, R. T. Nagao and J. L. Key
Department of Botany, University of Georgia, Athens, Georgia 30602
Previously, we reported the characterization of a developmentally regulated
proline-rich cell wall protein (SbPRP1) gene of soybean; the encoded
protein is represented by a consensus amino acid repeat structure of
Pro-Pro-Val-Tyr-Lys [Hong, J.C., Nagao, R.T., and Key, J.L. (1987). J.
Biol. Chem. 262, 8367-8376]. Two other closely related members of this
family of proline-rich protein (PRP) genes (SbPRP2 and SbPRP3), which
differ from the extensin family of cell wall proteins, have been
characterized (J.C. Hong, R.T. Nagao, and J.L. Key, unpublished results).
Here we report studies on the regulation of expression of this gene family
during soybean development by analyzing various plant organs, including
leaves, stems, and roots of etiolated seedlings and light-grown plants, as
well as young and mature pods, seed coats, and cotyledons. These organs
were tested at different stages of development (young and fully mature
tissue). Although a high level of sequence homology is observed at the
nucleotide and amino acid sequence level among these three PRP
genes/proteins, there are marked differences in the patterns of expression
of each gene in different plant organs and organ regions. SbPRP1 is highly
expressed and is the predominant form of PRP transcript in the mature
hypocotyl, root, and immature seed coat. SbPRP2 is the major form of PRP in
the apical hypocotyl and young suspension culture cells. SbPRP3 is the
major form of PRP gene expressed in aerial parts; it is highly expressed in
leaves, although no expression is detected in the roots. These data
demonstrate that proline-rich protein genes are developmentally regulated,
showing both dramatic stage-specific and organ-specific expression.
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