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Volume 58, Issue 3 p. 1306-1317
Research

Sclerotinia Blight Resistance in the US Peanut Mini-Core Collection

Rebecca S. Bennett

Corresponding Author

Rebecca S. Bennett

Wheat, Peanuts and Other Field Crops Research Unit, USDA-ARS, 1301 N. Western Rd., Stillwater, OK, 74075-2714

Corresponding author ([email protected]).Search for more papers by this author
Kelly D. Chamberlin

Kelly D. Chamberlin

Wheat, Peanuts and Other Field Crops Research Unit, USDA-ARS, 1301 N. Western Rd., Stillwater, OK, 74075-2714

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John P. Damicone

John P. Damicone

Dep. of Entomology and Plant Pathology, Oklahoma State Univ., 127 Noble Research Center, Stillwater, OK, 74078-3033

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First published: 01 May 2018
Citations: 11

Abstract

Germplasm collections are valuable sources of desirable traits such as disease resistance, but many accessions have yet to be characterized. Seventy-one accessions of the US peanut (Arachis hypogaea L.) mini-core were evaluated from 2013 to 2015 for yield, seed quality characteristics, Sclerotinia blight (caused by Sclerotinia minor Jagger) resistance in the field, and for a Sclerotinia resistance marker. Twenty-one accessions with <10% and six accessions with <5% disease incidence were identified from the 2 yr most favorable for disease. Resistant accessions were more likely to have a simple sequence repeat marker for Sclerotinia blight resistance, and a negative correlation between disease incidence and the presence of the resistance marker was observed. One resistant mini-core accession, CC650 (PI 478819), was similar to commercial cultivars in yield (3617 kg ha−1 over 3 yr). CC650 also had the highest seed grade among entries at 73%, large kernels (73 g 100 seed−1), and a large proportion of extra-large kernels. In growth chamber inoculation tests, CC650 was similar to the resistant cultivar ‘Georgia-03L’. These results may be useful to peanut breeders seeking additional sources of resistance to Sclerotinia minor.