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Tomato extensin and extensin-like cDNAs: structure and expression in response to wounding

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Abstract

Two tomato cDNA libraries were synthesized from poly(A)+ RNAs isolated from unwounded and wounded tomato stems. These cDNA libraries were packaged in λgt10 and screened by in situ plaque hybridization with a tomato extensin gene clone (pTom 5.10). Several cDNA clones were identified and isolated from both libraries in this manner and subjected to restriction enzyme digestion, Southern gel blot hybridization, RNA gel blot hybridization, and DNA sequence analyses. From these analyses, the various cDNA clones were found to fall into one of five distinct classes (classes I–V). Class I clones hybridized to a 4.0 kb mRNA which accumulated markedly after wounding and encoded an extensin characterized largely by Ser-(Pro)4-Ser-Pro-Ser-(Pro)4-(Tyr)3-Lys repeats. Class II clones hybridized to a 2.6 kb mRNA which showed no accumulation following wounding and encoded an extensin containing Ser-(Pro)4-Ser-Pro-Ser-(Pro)4-Thr-(Tyr)1–3-Ser repeats. Class III clones hybridized to a 0.6 kb mRNA which greatly accumulated in response to wounding and encoded a glycine-rich protein (GRP) with (Gly)2–6-Tyr-Pro and(Gly)2–6-Arg repeats. Class IV clones contained both class I and class III DNA sequences and consequently hybridized to both the 4.0 kb and the 0.6 kb wound-accumulating mRNAs; these clones encoded a portion of a GRP sequence on one DNA strand and encoded a portion of an extensin sequence on the other DNA strand. Class V clones hybridized to a 2.3 kb mRNA which decreased following wounding and encoded a GRP sequence characterized by (Gly)2–5-Arg repeats.

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Author notes

  1. Dominique Rumeau

    Present address: Centre Physiologie Végétale, Université Paul Sabatier, 118, route de Narbonne, 31062, Toulouse Cedex, France

Authors and Affiliations

  1. Department of Botany, Molecular and Cellular Biology Program, Ohio University, 45701, Athens, OH, USA

    Allan M. Showalter, Jin Zhou & Dominique Rumeau

  2. Department of Biology, Washington University, 63130, St. Louis, MO, USA

    Susan G. Worst & Joseph E. Varner

Authors
  1. Allan M. Showalter
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  2. Jin Zhou
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  3. Dominique Rumeau
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  4. Susan G. Worst
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  5. Joseph E. Varner
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Showalter, A.M., Zhou, J., Rumeau, D. et al. Tomato extensin and extensin-like cDNAs: structure and expression in response to wounding. Plant Mol Biol 16, 547–565 (1991). https://doi.org/10.1007/BF00023421

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  • DOI: https://doi.org/10.1007/BF00023421

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