Abstract
Host resistance to “yellow dwarf” or “moonlight” disease cause by any population (Hg type) of Heterodera glycines I., the soybean cyst nematode (SCN), requires a functional allele at rhg1. The host resistance encoded appears to mimic an apoptotic response in the giant cells formed at the nematode feeding site about 24–48 h after nematode feeding commences. Little is known about how the host response to infection is mediated but a linked set of 3 genes has been identified within the rhg1 locus. This study aimed to identify the role of the genes within the locus that includes a receptor-like kinase (RLK), a laccase and an ion antiporter. Used were near isogeneic lines (NILs) that contrasted at their rhg1 alleles, gene-based markers, and a new Hg type 0 and new recombination events. A syntenic gene cluster on Lg B1 was found. The effectiveness of SNP probes from the RLK for distinguishing homolog sequence variants on LgB1 from alleles at the rhg1 locus on LgG was shown. The resistant allele of the rhg1 locus was shown to be dominant in NILs. None of the recombination events were within the cluster of the three candidate genes. Finally, rhg1 was shown to reduce the plant root development. A model for rhg1 as a dominant multi-gene resistance locus based on the developmental control was inferred.
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Acknowledgments
The physical map was based upon work supported by the National Science Foundation under Grant No. 9872635. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. The continued support of SIUC, College of Agriculture and Office of the Vice Chancellor for Research to DAL is appreciated. The authors thank Dr. Q. Tao and Dr, H.B. Zhang for assistance with fingerprinting. We thank Dr. C. Town and Dr. C. Foo at TIGR for the BES. We thank the DOE CJSP for release of the WGS reads and scaffolds. We thank the Government of India for support of the Fellowship for NS.
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Communicated by I. Rajcan.
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Afzal, A.J., Srour, A., Saini, N. et al. Recombination suppression at the dominant Rhg1/Rfs2 locus underlying soybean resistance to the cyst nematode. Theor Appl Genet 124, 1027–1039 (2012). https://doi.org/10.1007/s00122-011-1766-6
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DOI: https://doi.org/10.1007/s00122-011-1766-6