Page Banner

United States Department of Agriculture

Agricultural Research Service

Research Project: IMPROVEMENT OF PEST RESISTANCE AND QUALITY TRAITS OF SOYBEAN

Location: Corn, Soybean and Wheat Quality Research Unit

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

Authors
item Jun, Tae-Hwan -
item Mian, Rouf
item Kang, Sung-Taeg -
item Michel, Andrew -

Submitted to: Journal of Theoretical and Applied Genetics
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: May 18, 2012
Publication Date: June 13, 2012
Repository URL: http://handle.nal.usda.gov/10113/56269
Citation: Jun, T., Mian, R.M., Kang, S., Michel, A.P. 2012. Genetic mapping of the powdery mildew resistance gene in soybean PI 567301B. Journal of Theoretical and Applied Genetics. DOI 10.1007/s00122-012-1902-y.

Interpretive Summary: Powdery mildew of soybean is fungal foliar disease. Severe infection of powdery mildew on susceptible varieties can result in 20-50% 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 mildew susceptible soybean cultivar Wyandot and resistant plant introduction (PI) 567301B from China were used for genetic mapping of PMD resistance gene in PI 567301B and for development of molecular markers tightly linked to the gene. The result of the mildew screening for each line in the field was in agreement with that in the greenhouse test. The genetic map containing the resistance gene was constructed in a 3.3 cM interval flanked by two simple sequence repeat (SSR) markers on soybean chromosome 16. The resistance gene was mapped at the same location with SSR marker BARCSOYSSR_16_1291. Additionally, 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 resistance gene. We validated three tightly linked markers to the resistance gene using 38 BC6F2 lines and corresponding BC6F2:3families. The three marker genotypes of the backcross lines predicted the observed mildew phenotypes of the lines with complete accuracy. We have mapped a putatively novel single dominant mildew resistance gene in PI 567301B and developed three molecular markers closely linked to the gene. Molecular markers developed from this study may be used for high-throughput marker-assisted breeding for powdery mildew resistance with the gene from PI 567301B.

Technical Abstract: Powdery mildew (PMD) of soybean [Glycine max (L.) Merr.] is caused by the fungus Microsphaera diffusa. Severe infection of PMD on susceptible varieties often cause 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 PMD susceptible soybean cultivar Wyandot and PMD resistant PI 567301B were used for genetic mapping of PMD resistance gene 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 recombinant among the 334 RILs and this marker. Additionally, 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 BC6F2:3families. 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 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.

Last Modified: 7/31/2014
Footer Content Back to Top of Page