Molecular mapping of Asian soybean rust resistance in soybean landraces PI 594767A, PI 587905 and PI 416764. (10th April 2014)

• Record Type: Journal Article
• Authors: Hossain, M. M.; Akamatsu, H.; Morishita, M.; Mori, T.; Yamaoka, Y.; Suenaga, K.; Soares, R. M.; Bogado, A. N.; Ivancovich, A. J. G.; Yamanaka, N.
• Is Part Of: Plant pathology. Volume 64:Number 1(2015:Feb.)
• Page Start: 147
• Page End: 156
• Publication Date: 2014-04-10
• Subjects: Agricultural pests -- Periodicals; Plant diseases -- Periodicals; 632
• DOI: 10.1111/ppa.12226
• Languages: English
• ISSNs: 0032-0862

Abstract

<abstract abstract-type="main" id="ppa12226-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Asian soybean rust (ASR), caused by <italic>Phakopsora pachyrhizi</italic>, is one of the most serious diseases of soybean. The soybean landraces PI 594767A, PI 587905 and PI 416764 previously showed high levels of resistance to a wide range of ASR fungus, while the genetic basis of the resistance has yet to be understood. In this study, the ASR resistance loci were mapped using three independent mapping populations, POP‐1, POP‐2 and POP‐3 derived from crosses BRS184 × PI 594767A, BRS184 × PI 587905 and BRS184 × PI 416764, respectively. In each population, the resistance to ASR segregated as a single gene, but the resistance was dominant in PI 594767A and PI 587905 and incompletely dominant in PI 416764. The resistance genes from both PI 594767A and PI 587905 were mapped on chromosome 18 corresponding to the same location as known resistance locus <italic>Rpp1</italic>. Quantitative trait locus (QTL) analysis performed on POP‐3 identified the putative ASR resistance locus in PI 416764 on the defined region of chromosome 6 where <italic>Rpp3</italic> was located. The QTLs detected by the mapping explained about 67–72% of the phenotypic variation in POP‐3. Cluster analysis based on disease reactions to 64 ASR populations demonstrated the presence of at least two types of functional resistant <italic>Rpp1</italic> alleles: strong and weak allele(s), e.g. soybean accession PI 594767A and PI 587905 carry the strong resistant <italic>Rpp1</italic> allele(s). Introducing or pyramiding strong <italic>Rpp1</italic> allele(s) in elite soybean cultivars is expected to be useful against the South American rust population.</p> </abstract>