Genetic mapping of the powdery mildew resistance gene in soybean PI 567301B

Jun, T-W. and Mian, M. A. R. and Kang, S-T. and Michel, A. P. (2012) Genetic mapping of the powdery mildew resistance gene in soybean PI 567301B. TAG Theoretical and Applied Genetics, 125. pp. 1159-1168.

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often causes premature defoliation and chlorosis of the leaves, which can result in considerable yield losses under favorable environmental conditions for disease development in the field. A total of 334 F7-derived recombinant inbred lines (RILs) from a cross of a PMD susceptible soybean cultivar Wyandot and PMD-resistant PI 567301B were used for genetic mapping of PMD resistance in PI 567301B and for development of molecular markers tightly linked to the gene. The result of the PMD screening for each line in the field was in agreement with that in the greenhouse test. The genetic map containing the PMD resistance gene was constructed in a 3.3 cM interval flanked by two simple sequence repeat (SSR) markers on chromosome 16. The PMD resistance gene was mapped at the same location with SSR marker BARCSOYSSR_16_1291, indicating that there was no recombination between the 334 RILs and this marker. In addition, a single nucleotide polymorphism (SNP) marker developed by high-resolution melting curve analysis and a cleaved amplified polymorphic sequence (CAPS) marker with Rsa1 recognition site were used for the genetic mapping. These two markers were also mapped to the same genomic location with the PMD resistance gene. We validated three tightly linked markers to the PMD resistance gene using 38 BC6F2 lines and corresponding BC6F2:3 families. The three marker genotypes of the backcross lines predicted the observed PMD phenotypes of the lines with complete accuracy. We have mapped a putatively novel single dominant PMD resistance gene in PI 567301B and developed three new molecular markers closely linked to the gene. Molecular markers developed from this study may be used for high-throughput marker-assisted breeding for PMD resistance with the gene from PI 567301B.

Item Type: Article
Author Affiliation: Department of Entomology, The Ohio State Univ/OARDC, 1680 Madison Avenue, Wooster, OH 44691, USA
Subjects: Crop Improvement > Genetics/Genomics
Divisions: Soyabean
Depositing User: Mr Siva Shankar
Date Deposited: 18 Sep 2012 05:49
Last Modified: 18 Sep 2012 05:50
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