Characterization of differentiating lines of phytophthora in soybean

This is the authors' abstract. We don't add key points for this paper.

The objective of this study was the characterization of commercial cultivars, differentiating lines/cultivars of Phytophthora sojae carrying Rps (resistance Phytophthora Sojae ) genes, inoculated with different pathotypes. Thirty‐one differentiating soybeans ( Glycine max (L.) Merrill) lines/cultivars carrying Rps genes and six commercial cultivars were evaluated for virulence pattern to PS2.4, PS14.4, PS36.1, PS34.1, and CMES1608 pathotypes. Inoculations were performed using the toothpick technique, with reaction evaluation about 15 days after infection, where the number of healthy, infected, and dead seedlings was quantified. There was a difference in resistance for the pathotypes, and the most virulent were PS34.1 and PS36.1. The Rps1k , Rps11 , and Rp12 genes deserve to be highlighted by resistance to the PS34.1 pathotype and the Rps1k , Rps11 , Rp12 , and Rps8 genes to the PS36.1 pathotype. The line L77‐1863 ( Rps1b ) showed resistance to the PS2.4 and PS14.4 pathotypes. The characterization of the genotypes allowed the updating of information about them and the identification of new possibilities of resistance sources.