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Identification and molecular mapping of two soybean aphid resistance genes

Identification and molecular mapping of two soybean aphid resistance genes

In the April ’14 issue of Theoretical and Applied Genetics, Ki-Seung Kim and four associates  published a paper entitled, “Identification and molecular mapping of two soybean aphid resistance genes in soybean PI 587732.” In their introductory remarks they have described  Soybean [Glycine max (L.) Merr.] to be continually devastated by the soybean aphid (Aphis glycines Matsumura: SA) in North America.  In view of this menace new efforts in search of  new soybean resistance sources were embarked  upon to fight the four identified SA biotypes.  In addition,  the objectives of this study were to determine the inheritance of SA resistance in PI 587732 and to map resistance gene(s). For this study,  the authors selected 323 F2 and 214 F3 plants derived from crossing PI 587732 to two susceptible genotypes. The entire population was challenged with three SA biotypes and evaluated with genetic markers.  The assessment of the candidate  plants revealed  that resistance to SA Biotype 1 in the first F2 population was controlled by a gene in theRag1 region on chromosome 7, while resistance to SA Biotype 2 in the second population was controlled by a gene in the Rag2 region on chromosome 13. Based on the results of the study, it was concluded that the resistance gene in the Rag1 region in PI 587732 may be a different allele or gene from Rag1 from Dowling.  The two SA resistance loci and genetic marker information from this study will pave the way in increasing diversity of SA resistance sources and marker-assisted selection for soybean breeding programs.

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