Registration of high-oleic peanut germplasm line ARSOK-S1 (TX996784) with enhanced resistance to Sclerotinia blight and pod rot

The high-oleic spanish peanut (Arachis hypogaea L. subsp. fastigiata var. vulgaris) germplasm line ARSOK-S1 (Reg. No. GP-237, PI 670132) was developed cooperatively by the USDA–ARS, Texas A&M AgriLife Research, and Oklahoma State University and was released in 2013. ARSOK-S1 (tested early as TX996784) is the product of a fourth backcross between the recurrent parent 'Tamspan 90' and F435-1-1, the donor of the high-oleic trait. Field performance testing in Oklahoma and Texas indicates that ARSOK-S1 has significantly enhanced resistance to Sclerotinia blight (caused by Sclerotinia minor Jagger) and pod rot (caused by Rhizoctonia solani Kühn, Pythium myriotylum Dresch.), two diseases prominent in the southwestern United States but also prevalent across many U.S. peanut-growing regions. The purpose for releasing ARSOK-S1 is to provide breeding programs with a source of a high-oleic spanish-type peanut that has acceptable yield and grade along with enhanced disease resistance.