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Molecular characterization of maize extensin expression

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Abstract

This study concerned the developmental regulation of wall-localized, hydroxyproline-containing proteins in maize tissues and organs. Silk and pericarp cell walls contained more peptidyl hydroxyproline than did walls of any vegetative tissue, although all tissues and organs accumulated these proteins as they matured. In many tissues, hydroxyproline-rich proteins are first associated with the wall in a soluble form before being insolubilized through covalent attachment to the matrix. Because hydroxyproline was more soluble earlier than later in development, it appears that insolubilization was occurring in maize tissues and organs as well. Tissue prints reacted with an anti-extensin antibody gave positive results, indicating the presence of a soluble form of this common hydroxyproline-rich glycoprotein (HRGP). Silk and pericarp cells actively synthesized this extensin from abundant transcripts. In vegetative tissues, extensin transcripts were somewhat more abundant in seedlings than in pre-anthesis or mature plants, but levels were much lower than in silk and pericarp. Southern blots of maize genomic DNA indicated that these extensin transcripts are encoded by a small multigene family. Potential roles for extensin in reproductive/protective tissues versus the embryo or vegetative tissues are suggested.

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  1. Department of Biology, Utah State University, 84322-5305, Logan, UT, USA

    Elizabeth E. Hood, Jenifer M. Murphy & Robert C. Pendleton

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  1. Elizabeth E. Hood
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  2. Jenifer M. Murphy
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  3. Robert C. Pendleton
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Hood, E.E., Murphy, J.M. & Pendleton, R.C. Molecular characterization of maize extensin expression. Plant Mol Biol 23, 685–695 (1993). https://doi.org/10.1007/BF00021524

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  • DOI: https://doi.org/10.1007/BF00021524

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