Tomato pith necrosis (TPN) caused by P. corrugata and P. mediterranea: severity of damages and crop loss assessment
2004
Moura, M.L. | Brito, L.M. | Mourao, I.M. | Jacques, Marie Agnes | Duclos, Jean-Baptiste | Escola Superior Agraria (ESA) | Unité de recherche Pathologie végétale et phytobactériologie ; Institut National de la Recherche Agronomique (INRA) | Universidade de Lisboa = University of Lisbon = Université de Lisbonne (ULISBOA)
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Show more [+] Less [-]English. Tomato pith necrosis (TPN) is caused mainly by soil-borne Pseudomonas spp., formerly known as Pseudomonas corrugata. Considerable phenotypic diversity and evidence of genomic variability were the basis of the characterization of two species within this group: P. corrugata and P. mediterranea sp. nov. Both have been isolated in several countries, including Portugal. There is no report on the relative aggressiveness of these two TPN-causing Pseudomonas species under commercial-like greenhouse conditions. In this study, the severity and progress of pith necrosis caused by P. corrugata and P. mediterranea were compared under spring/summer greenhouse conditions in northern Portugal. In addition, a precise assessment of the yield of tomatoes (number, size and weight of fruits) was carried out to determine the relationship among bacterial species, disease severity and yield loss. Tomato plants were stem-injected with either strain A344 of P. corrugata or strain A54 of P. mediterranea, 45 and 60 days after transplantation in the greenhouse. TPN symptoms were recorded throughout the growing period. Yield of tomato fruits was assessed weekly during the last seven weeks. Both strains showed a similar level of aggressiveness and caused the same type of symptoms. Both strains were responsible for significant yield reductions, however, no correlation (Pmore than or equal to 0.05) was found between pith lesion length and fruit loss
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