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The root epidermis-specific pea gene RH2 is homologous to a pathogenesis-related gene

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Abstract

Two-dimensional gel electrophoresis of pea root and root hair proteins revealed the existence of at least 10 proteins present at elevated levels in root hairs. One of these, named RH2, was isolated and a partial amino acid sequence was determined from two tryptic peptides. Using this sequence information oligonucleotides were designed to isolate by PCR an RH2 cDNA clone. In situ hybridization studies with this cDNA clone showed that rh2 is not only expressed in root hairs, but also in root epidermal cells lacking these tubular outgrowths. During post-embryonic development the gene is switched on after the transition of protoderm into epidermis and since rh2 is already expressed in a globular pea embryo in the protoderm at the side attached to the suspensor, we conclude that the expression of rh2 is developmentally regulated. At the amino acid level RH2 is 95% homologous to the pea PR protein I49a. These gene encoding I49a is induced in pea pods upon inoculation with the pathogen Fusarium solani [12]. We postulate that rh2 contributes to a constitutive defence barrier in the root epidermis. A similar role has been proposed for chalcone synthase (CHS) and chitinase, pathogenesis-related protein that are also constitutively present in certain epidermal tissues.

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  1. Ton Gloudemans

    Present address: Laboratorium voor Fysiologische Chemie, Rijksuniversiteit, Utrecht, Netherlands

Authors and Affiliations

  1. Department of Molecular Biology, Agricultural University, Dreijenlaan 3, 6703 HA, Wageningen, Netherlands

    Panagiota Mylona, Marja Moerman, Wei-Cai Yang, Ton Gloudemans, Ab van Kammen, Ton Bisseling & Henk J. Franssen

  2. Laboratorium voor Genetika, Rijksuniversiteit Gent, B-9000, Gent, Belgium

    Joel Van De Kerckhove

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  1. Panagiota Mylona
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  2. Marja Moerman
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  7. Ton Bisseling
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  8. Henk J. Franssen
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Mylona, P., Moerman, M., Yang, WC. et al. The root epidermis-specific pea gene RH2 is homologous to a pathogenesis-related gene. Plant Mol Biol 26, 39–50 (1994). https://doi.org/10.1007/BF00039518

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  • DOI: https://doi.org/10.1007/BF00039518

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