Assessment of Resistance Status of Tomato Progenies to Ralstonia pseudosolanacearum and Ralstonia solanacearum Using Analysis of GGE Biplot and REML/BLUP

Abstract

The bacterial wilt, caused by Ralstonia pseudosolanacerum and Ralstonia solanacerum, is among the bacterial diseases responsible for tomato fruit yield reduction in Brazil. The aim of this work was to assess the resistance status of tomato progenies to Ralstonia pseudosolanacearum and Ralstonia solanacearum using analysis of GGE biplot and REML/BLUP. In 2016, forty-three progenies derived from the cross between Yoshimatsu and IPA-7 were assessed in the Recife city, Pernambuco (PE), Brazil. It was used a randomized block design with four replications, applying the CCRMRS-74 and CCRMRS-185 isolates. The assessments were performed considering the data on the tenth and the twentieth days after inoculation as different environments. The incidence and severity of the disease were evaluated using a descriptive grading scale. The analysis of variance proved there are different performances between the genotypes and between the bacteria besides the interaction genotypes x bacteria. The selection of genotypes adapted to Ralstonia solanacearum and Ralstonia pseudosolanacearum are necessary to give continuity to the resistant tomato breeding program. There was agreement between the GGE biplot and REML/BLUP methods on the identification of genotypes resistant to both bacterial species evaluated. Genotypes 6, 7, 17, 18, 25, 27, and 31 showed resistance to Ralstonia pseudosolanacearum, and progenies 1, 2, 15, 16, and 35 demonstrated greater resistance to Ralstonia solanacearum. The individuals selected may continue the breeding program and be used as a source of variation of those bacterial species.