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Journal of Experimental Botany, Vol. 53, No. 379, pp. 2455-2457, December 1, 2002
© 2002 Oxford University Press

Isolation and characterization of a potato cDNA corresponding to a 1-aminocyclopropane-1-carboxylate (ACC) oxidase gene differentially activated by stress

Received 22 July 2002; Accepted 27 August 2002

María Eugenia Zanetti1, María Cecilia Terrile1, Débora Arce1, Andrea Verónica Godoy1, Blanca San Segundo2 and Claudia Casalongué3,1

1 Instituto de Investigaciones Biológicas-Departamento de Biología, Universidad Nacional de Mar del Plata, Funes 3250, CC 1245, 7600 Mar del Plata, Argentina
2 Instituto de Biología Molecular de Barcelona, Centro de Investigación y Desarrollo (CSIC), Jordi Girona 18-24, 08034 Barcelona, España

3 To whom correspondence should be addressed: Fax: +54 223 4753150. E-mail: casalong{at}bart.mdp.edu.ar

1-Aminocyclopropane-1-carboxylate (ACC) oxidase enzyme catalyses the final step in ethylene biosynthesis, converting 1-aminocyclopropane-1-carboxylic acid to ethylene. A cDNA clone encoding an ACC oxidase, ST-ACO3, was isolated from potato (Solanum tuberosum L.) by differential screening of a Fusarium eumartii infected-tuber cDNA library. The deduced amino acid sequence exhibited similarity to other ACC oxidase proteins from several plants species. Northern blot analysis revealed that the ST-ACO3 mRNA level increased in potato tubers upon inoculation with F. eumartii, as well as after treatment with salicylic acid and indole-3-acetic acid, suggesting a cross-talk between different signalling pathways involved in the defence response of potato tubers against F. eumartii attack.

Key words: ACC oxidase, ethylene, Fusarium eumartii, indole-3-acetic acid, Solanum tuberosum, stress response, wounding.


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