Root-specific expression of a Zea mays gene encoding a novel glycine-rich protein, zmGRP3

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The isolation and characterization of a cDNA clone from Zea mays coding for a novel glycine-rich protein (GRP) is described. The corresponding 1.4 kb mRNA accumulates exclusively in roots (primary, lateral seminal and crown roots) of young maize seedlings, following developmentally specific patterns. In agreement with previously described GRPs from other plant species the derived protein sequence exhibits a hydrophobic domain at the N-terminal region followed by repeated glycine-rich motifs. Genomic Southern analysis indicates that the zmGRP3 gene is present in the maize genome as one or two copies or at a low copy number.

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