SCREENING OF Lycopersicon sp. ACCESSIONS FOR RESISTANCE TO Pepper yellow mosaic virus

ABSTRACT: The tomato is a crop of great economical importance, however it is susceptible to a large number of pests and diseases, including viral disease for which the best control strategy is genetic resistance. The disease, caused by Pepper yellow mosaic virus (PepYMV) has become a recent problem. Consequently, the idea of this work was to screen 376 accessions of Lycopersicon sp. to find possible sources of resistance to PepYMV. Out of 355 accessions of L. esculentum inoculated with PepYMV, 52 did not express symptoms. However, the virus reached high concentration in the tissues as measured by indirect ELISA, and therefore they were not considered as safe sources of resistance. Among 21 accessions of wild Lycopersicon species, one of L. hirsutum was shown to be resistant, with no observed symptoms. A low concentration of the virus was detected as measured by indirect ELISA. This accession seems to be suitable for breeding programs aiming at incorporating resistance for this disease into commercial tomato cultivars. Key words: Lycopersicon hirsutum, genetic resources, viruses, potyvirus IDENTIFICAÇÃO DE FONTES DE RESISTÊNCIA DE ACESSOS DE Lycopersicon sp. AO Pepper yellow mosaic virus RESUMO: O tomateiro é uma olerícola de grande importância econômica, porém suscetível a u