Submitted to: American Peanut Research and Education Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 5/1/2015
Publication Date: 11/1/2015
Citation: Bennett, R.S., Chamberlin, K.D., Damicone, J.P. 2015. Resistance to Sclerotinia blight in the U.S. Peanut Mini-Core Collection [abstract]. In: Proceedings of the American Peanut Research and Education Society Meeting, July 14-16, 2015, Charleston, SC. 47:65.
Technical Abstract: Seventy-one of the 112 accessions comprising the U.S. Peanut Mini-Core Collection were evaluated in 2013 and 2014 for resistance to Sclerotinia blight, caused by Sclerotinia minor. Susceptible cultivar Okrun, and resistant cultivars Southwest Runner, Tamnut OL06, and Tamspan 90, were included for reference. Entries were grown in two-row plots, each 1.8-m wide and 4.6-m long, using a randomized complete block design with three replications. Moderate to low levels of Sclerotinia blight were observed in 2013, with 12% disease incidence in Okrun, and 1% or less in Southwest Runner, Tamnut OL06, and Tamspan 90. More disease was observed in 2014, with 69% disease incidence in Okrun, and 6-7% in Southwest Runner, Tamnut OL06, and Tamspan 90. Five mini-core accessions (Core Collection/PI nos.: 227/290566; 233/290536; 246/343398; 287/355271; 342/298854) were highly susceptible to Sclerotinia blight and exhibited 41-64% disease incidence in 2013, and 68-96% in 2014. Significant resistance to Sclerotinia blight (<10% disease incidence) was observed in 13 accessions in 2014. This information will be useful to peanut breeders seeking sources of Sclerotinia blight resistance to introgress into elite lines.