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Plant Cell. Sep 1989; 1(9): 881–887.
PMCID: PMC159824

Pathogenesis-related proteins are developmentally regulated in tobacco flowers.


The accumulation of pathogenesis-related proteins (PR) in tobacco leaves has been casually related to pathogen and specific physiological stresses. The known enzymatic function of some of these proteins is potentially antimicrobial. By using antibodies specific to three classes of pathogenesis-related proteins, we examined tobacco plants during their normal growth. The pathogenesis-related proteins accumulated during the normal development of the tobacco flower. The PR-1 class of proteins (biological function unknown) is located in sepal tissue. PR-P, Q polypeptides are endochitinases and are present in pedicels, sepals, anthers, and ovaries. A glycoprotein serologically related to the PR-2,N,O class is a (1,3)-beta-glucanase and is present in pistils. Differential appearance during flower development, in situ localization, and post-translational processing of floral pathogenesis-related proteins point to a hitherto unsuspected function these classes of pathogenesis-related proteins play in the normal process of flowering and reproductive physiology.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Cornelissen BJ, Horowitz J, van Kan JA, Goldberg RB, Bol JF. Structure of tobacco genes encoding pathogenesis-related proteins from the PR-1 group. Nucleic Acids Res. 1987 Sep 11;15(17):6799–6811. [PMC free article] [PubMed]
  • Kombrink E, Schröder M, Hahlbrock K. Several "pathogenesis-related" proteins in potato are 1,3-beta-glucanases and chitinases. Proc Natl Acad Sci U S A. 1988 Feb;85(3):782–786. [PMC free article] [PubMed]
  • Laemmli UK. Cleavage of structural proteins during the assembly of the head of bacteriophage T4. Nature. 1970 Aug 15;227(5259):680–685. [PubMed]
  • Memelink J, Hoge JH, Schilperoort RA. Cytokinin stress changes the developmental regulation of several defence-related genes in tobacco. EMBO J. 1987 Dec 1;6(12):3579–3583. [PMC free article] [PubMed]
  • Thotakura NR, Bahl OP. Enzymatic deglycosylation of glycoproteins. Methods Enzymol. 1987;138:350–359. [PubMed]
  • Pfitzner UM, Goodman HM. Isolation and characterization of cDNA clones encoding pathogenesis-related proteins from tobacco mosaic virus infected tobacco plants. Nucleic Acids Res. 1987 Jun 11;15(11):4449–4465. [PMC free article] [PubMed]
  • Rigden J, Coutts R. Pathogenesis-related proteins in plants. Trends Genet. 1988 Apr;4(4):87–89. [PubMed]
  • Shinshi H, Mohnen D, Meins F. Regulation of a plant pathogenesis-related enzyme: Inhibition of chitinase and chitinase mRNA accumulation in cultured tobacco tissues by auxin and cytokinin. Proc Natl Acad Sci U S A. 1987 Jan;84(1):89–93. [PMC free article] [PubMed]
  • Towbin H, Staehelin T, Gordon J. Electrophoretic transfer of proteins from polyacrylamide gels to nitrocellulose sheets: procedure and some applications. Proc Natl Acad Sci U S A. 1979 Sep;76(9):4350–4354. [PMC free article] [PubMed]

Articles from The Plant Cell are provided here courtesy of American Society of Plant Biologists


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