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THE PLANT CELL, Vol 3, Issue 1 23-37, Copyright © 1991 by American Society of Plant Biologists
Tissue-Specific Expression of Cell Wall Proteins in Developing Soybean Tissues
Z. H. Ye and J. E. Varner
Department of Biology, Washington University, St. Louis, Missouri 63130
Cell wall hydroxyproline-rich glycoproteins (HRGPs) and glycine-rich
proteins (GRPs) were examined at the protein and at the mRNA levels in
developing soybean tissues by tissue print immunoblots and RNA blots. In
young soybean stems, HRGPs are expressed most heavily in cambium cells, in
a few layers of cortex cells surrounding primary phloem, and in some
parenchyma cells around the primary xylem, whereas GRPs are highly
expressed in the primary xylem and also in the primary phloem. In older
soybean stems, HRGP genes are expressed exclusively in cambium cells and
GRP genes are most heavily expressed in newly differentiated secondary
xylem cells. Similar expression patterns of HRGPs and of GRPs were found in
soybean petioles, seedcoats, and young hypocotyls, and also in bean
petioles and stems. HRGPs and GRPs become insolubilized in soybean stem
cell walls. Three major HRGP mRNAs and two major GRP mRNAs accumulate in
soybean stems. Soluble HRGPs are abundant in young hypocotyl apical regions
and young root apical regions, whereas in hypocotyl and root mature
regions, soluble HRGPs are found only in a few layers of cortex cells
surrounding the vascular bundles. GRPs are specifically localized in
primary xylem cell walls of young root. These results show that the gene
expression of HRGPs and GRPs is developmentally regulated in a
tissue-specific manner. In soybean tissues, HRGPs are most heavily
expressed in meristematic cells and in some of those cells that may be
under stress, whereas GRPs are expressed in all cells that are or are going
to be lignified.
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