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Journal of Experimental Botany, Vol. 52, No. 362, pp. 1947-1948, September 1, 2001
© 2001 Oxford University Press

Gene Note

Cryptogein affects expression of {alpha}3, {alpha}6 and ß1 20S proteasome subunits encoding genes in tobacco

Joseph Dahan, Philippe Etienne, Anne-Sophie Petitot, Valérie Houot, Jean-Pierre Blein and Lydie Suty1

UMR INRA-Université de Bourgogne, Phytopharmacie et Biochimie des Interactions Cellulaires, INRA BP 86510, 21065 Dijon cedex, France

Abstract

Twelve {alpha} and ß 20S proteasome subunits cDNAs showing 70–82% identity with the corresponding genes in Arabidopsis or rice, and features of eukaryotic proteasome subunits were cloned in tobacco. Only ß1-tcI 7, {alpha}3 and {alpha}6, 20S proteasome subunits encoding genes were up-regulated by cryptogein, a proteinaceous elicitor of plant defence reactions. These results led to the hypothesis that the activation of ß1-tcI 7, {alpha}3 and {alpha}6 could induce a specific proteolysis involved in the hypersensitive response and systemic acquired resistance monitored by cryptogein.

Key words: Elicitins, 20S proteasome subunits, plant defence reactions.


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