Publication: Genomic analysis of a region encompassing QRfs1 and QRfs2: Genes that underlie soybean resistance to sudden death syndrome
Issued Date
2005-01-01
Resource Type
ISSN
08312796
DOI
Other identifier(s)
2-s2.0-19944406818
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Mahidol University
Rights Holder(s)
SCOPUS
Bibliographic Citation
Genome. Vol.48, No.1 (2005), 125-138
Suggested Citation
K. Triwitayakorn, V. N. Njiti, M. J. Iqbal, S. Yaegashi, C. Town, D. A. Lightfoot Genomic analysis of a region encompassing QRfs1 and QRfs2: Genes that underlie soybean resistance to sudden death syndrome. Genome. Vol.48, No.1 (2005), 125-138. doi:10.1139/g04-103 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/16248
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Title
Genomic analysis of a region encompassing QRfs1 and QRfs2: Genes that underlie soybean resistance to sudden death syndrome
Abstract
Candidate genes were identified for two loci, QRfs2 providing resistance to the leaf scorch called soybean (Glycine max (L.) Merr.) sudden death syndrome (SDS) and QRfs1 providing resistance to root infection by the causal pathogen Fusarium solani f.sp. glycines. The 7.5 ± 0.5 cM region of chromosome 18 (linkage group G) was shown to encompass a cluster of resistance loci using recombination events from 4 near-isogenic line populations and 9 DNA markers. The DNA markers anchored 9 physical map contigs (7 are shown on the soybean Gbrowse, 2 are unpublished), 45 BAC end sequences (41 in Gbrowse), and contiguous DNA sequences of 315, 127, and 110 kbp. Gene density was high at 1 gene per 7 kbp only around the already sequenced regions. Three to 4 gene-rich islands were inferred to be distributed across the entire 7.5 cM or 3.5 Mbp showing that genes are clustered in the soybean genome. Candidate resistance genes were identified and a molecular basis for interactions among the disease resistance genes in the cluster inferred. © 2005 NRC Canada.