Genetic mapping revealed two loci for soybean aphid resistance in PI 567301B |
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Authors: | Tae-Hwan?Jun Email author" target="_blank">M?A?Rouf MianEmail author Andrew?P?Michel |
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Institution: | (1) Department of Entomology, The Ohio State University/OARDC, 1680 Madison Avenue, Wooster, OH 44691, USA;(2) USDA-ARS and Department of Horticulture and Crop Science, The Ohio State University, 1680 Madison Avenue, Wooster, OH 44691, USA; |
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Abstract: | The soybean aphid (Aphis glycines Matsumura) is the most damaging insect pest of soybean Glycine max (L.) Merr.] in North America. New soybean aphid biotypes have been evolving quickly and at least three confirmed biotypes
have been reported in USA. These biotypes are capable of defeating most known aphid resistant soybean genes indicating the
need for identification of new genes. Plant Introduction (PI) 567301B was earlier identified to have antixenosis resistance
against biotype 1 and 2 of the soybean aphid. Two hundred and three F7:9 recombinant inbred lines (RILs) developed from a cross of soybean aphid susceptible cultivar Wyandot and resistant PI 567301B
were used for mapping aphid resistance genes using the quantitative trait loci (QTL) mapping approach. A subset of 94 RILs
and 516 polymorphic SNP makers were used to construct a genome-wide molecular linkage map. Two candidate QTL regions for aphid
resistance were identified on this linkage map. Fine mapping of the QTL regions was conducted with SSR markers using all 203
RILs. A major gene on chromosome 13 was mapped near the previously identified Rag2 gene. However, an earlier study revealed that the detached leaves of PI 567301B had no resistance against the soybean aphids
while the detached leaves of PI 243540 (source of Rag2) maintained aphid resistance. These results and the earlier finding that PI 243540 showed antibiosis resistance and PI 567301B
showed antixenosis type resistance, indicating that the aphid resistances in the two PIs are not controlled by the same gene.
Thus, we have mapped a new gene near the Rag2 locus for soybean aphid resistance that should be useful in breeding for new aphid-resistant soybean cultivars. Molecular
markers closely linked to this gene are available for marker-assisted breeding. Also, the minor locus found on chromosome
8 represents the first reported soybean aphid-resistant locus on this chromosome. |
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