Inheritance of rust (Phakopsora pachyrhizi) resistance in soybean

Use of rust resistant or tolerant soybean varieties is the most economical and safe strategy for management of rust. Soybean genotypes differ in their reactions to different rust isolates. Recently, six dominant genes resistant to soybean rust were described: Rpp1, Rpp2, Rpp3, Rpp4, Rpp5 and Rpp6. Research on soybean rust reveals inheritance of rust resistance is controlled by single dominant gene in most of the cases, two dominant and single recessive genes, two and three recessive gene in few cases only. Information reviewed on soybean rust disease development, different isolates, the inheritance of rust and mapping of rust resistance genes will help in enhancing and stabilizing the yields through the development of resistant cultivars. However, limited literature is available about the molecular interaction among soybean plant and soybean rust and on the molecular pathway triggered by pathogen recognition. Since Rpp genes provides resistance against specific isolates of P. pachyrhizi, pyramiding of different rust resistance Rpp genes can help breeders to create broader or more durable resistance.