Identify the Effectiveness of Some Soybean Rust Resistant Genes on Vietnam and Their Linkage Molecular Markers

Abstract

      Five genes Rpp1, Rpp2, Rpp3, Rpp4 & Rpp5 conferring resistance to Phakopsora pachyrhizi Sydow in soybean were identtified. Resistance evaluation of the soybean lines carrying resistant genes shows that genes Rpp2 and Rpp4 are highly resistant to soybean rust in Vietnam while Rpp5 is high resistant to the isolates of rust pathogen collected from Southvietnam. The selection of molecular markers linked to the above-mentioned resistance genes based on the analysis of crossing populations between resistant and susceptible cultivars shows that the markers Satt620, Satt288 and Sat_275 are closely linked to Rpp2, Rpp4 and Rpp5 with the genetic distance of 3.33cM, 2.50cM and 4.16cM, respectively. These markers may be used to identify and select resistance genes in germplasm and resistant individuals in segregating populations.