Registration of FC305 Multigerm Sugarbeet Germplasm Selected from a Cross to a Crop Wild Relative

FC305 (Reg. No. GP‐286, PI 671963) sugarbeet (Beta vulgaris L.) germplasm was developed and released by the USDA–ARS, at Fort Collins, CO, Salinas, CA, and East Lansing, MI, in cooperation with the Beet Sugar Development Foundation, Denver, CO. This germplasm is a diploid, sugarbeet population in normal cytoplasm, segregating for self‐sterility (Sf:SsSs), multigermity (M:mm), and hypocotyl color (R:rr). FC305 has moderate resistance to cercospora leaf spot (CLS) (caused by Cercospora beticola Sacc.), aphanomyces root rot (caused by Aphanomyces cochlioides Drechsl.), and beet curly top (Beet curly top virus), as well as resistance to Fusarium yellows [caused by Fusarium oxysporum Schlecht. f. sp. betae (Stewart) Snyd. & Hans.]. This germplasm is segregating for resistance to rhizomania (Beet necrotic yellow vein virus) and contains both Rz1 and Rz2 genes for resistance. There was no resistance to root‐rotting strains (AG‐2–2) of Rhizoctonia solani Kühn. FC305 could provide an alternate source of resistance to CLS and Fusarium yellows in a diverse genetic background to enrich the cultivated sugarbeet germplasm base. FC305 provides a source from which to select disease‐resistant, multigerm pollinator parents. Because monogerm and O‐type is within its parentage, it should be possible to select monogerm, O‐type, CMS‐maintainer lines from FC305 as well.