CHANGES IN GENE EXPRESION OF STRAWBERRY (Fragaria ananassa) DEFENSE RESPONSE AGAINST TWO Colletotrichum SPECIES

GRELLET, CARLOS; CASTAGNARO, ATILIO P.; DIAZ RICCI, JUAN C

Tafí del Valle. Tucumán

Jornada; 25º Jornadas Científicas de la Asociación de Biología de Tucumán; 2008

Asociación de Biología de Tucumán

The plants defense response usually involve early events, and late signals such as certain molecules that are associated exclusively with a specific signaling path, i.e. salicylic acid (SA), ethylene (ET), jasmonic acid (JA) and some phytoalexins, that lead to changes in the expression of many genes, including certain genes closely associated to these signal molecules. In this work, we evaluate the expression of genes closely associated to SA (e.g. FaPAL, PR-1) and ET (e.g. FaEtr1, FaACO, ApxSC) signaling pathways. As a model of plant-pathogen interaction we have used the cv. ´Pájaro´ of Fragaria ananassa, the avirulent pathogen Colletotrichum fragariae (isolated M23) and the virulent pathogen Colletotrichum acutatum (isolated M11). Results show an increase of gene expression associated to SA in the incompatible interaction and a lower expression of genes associated to ET pathway in the compatible interaction as compared to water-treated plants. These results confim the participation of SA in the defense response induced by the isolate M23 and the inhibition of the ET pathway exerted by the isolate M11, enabling by this mean the development of  the anthracnose disease.