Expression patterns in time and space during P.sojae infection of soybean cultivars differing in quantitative resistance

Four selected soybean genotypes with varying degrees of quantitative resistance that were well-characterized were selected for this study. These included two resistant genotypes (V71-370, Conrad), and two susceptible genotypes (Sloan, and VP-RIL9). A P. sojae isolate, PT2004C2.S1 , which is virulent to the soybean genotypes carrying Rps1a, Rps1b, Rps1k, Rps2, Rps3a, Rps3c, Rps4, Rps5, Rps6, or Rps7, was used in this study. Keywords: Genotypic variation on quantitative resistance The experiment was repeated four times. Factors assayed included: Genotype: 4 genotypes (V71-370, Conrad, Sloan, and VP-RIL9) Treatment: pathogen-inoculated vs. mock-inoculated Sampling time: 1, 2, 3 and 5dpi Sampling sites: Upper section and Lower section (for 3dpi and 5dpi pathogen-inoculated samples only) vs whole section (for all the mock-inoculated samples at all time points, and the inoculated samples at 1and 2dpi).