1a.Objectives (from AD-416):
Identify sources of resistance to frogeye leaf spot and septoria brown spot disease of soybean in early maturity groups (MG II-IV). Develop soybean breeding lines with resistance to frogeye leaf spot and brown spot.
1b.Approach (from AD-416):
The objective will be achieved identifying soybean germplasm line with resistance to frogeye leaf spot and brown spot using field screening and marker assisted selection. The resistant lines will then be crossed with high yielding MG II-IV soybean cultivars.
Twenty advanced breeding lines homozygous for the Rcs3 gene for frogeye leaf spot developed from a cross of Dennison x LN97-15076 were grown in replicated yield plots in Wooster, Ohio in 2012. Five best yielding lines were selected and the presence of homozygous Rcs3 gene in these lines was confirmed by molecular markers. Selected five lines have been planted in replicated plots at two locations in Ohio and at one location in Jackson, TN in 2013. The best yielding line based on the yield data from 2012 and 2013 will be selected for regional yield trials in 2014. This project expands on the parent project’s germplasm development objectives (2A and. 4)by identifying new yield genes of soybean.