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GERMPLASM

Breeding for Multiple Disease Resistance in Sugarbeet: Registration of FC220 and FC221

^a USDA-ARS, NPA, Crops Research Lab., 1701 Centre Ave, Fort Collins, CO 80526
^b USDA-ARS, PWA, Crop Improvement and Protection Research, 1636 East Alisal St., Salinas, CA 93905
^c current address: USDA-ARS Sugarbeet and Bean Unit, 494 Plant and Soil Sciences Bldg., Michigan State Univ., East Lansing, MI 48824-1325. Germplasm were developed in cooperation with the Beet Sugar Development Foundation, Denver, CO. Mention of trade names or commercial products in this article is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the U.S. Department of Agriculture

^* Corresponding author (Lee.Panella{at}ars.usda.gov).

ABSTRACT

FC220 (Reg. No. GP-263, PI 651015) and FC221 (Reg. No. GP-264, PI 651016) sugarbeet (Beta vulgaris L.) germplasm were released from 05-FC1030-15 (Sp) and 05-FC1030-16 (Sp) seed lots, respectively, and tested under those designations and as 03-FC1030-15 and 03-FC1030-16, respectively. They were developed by the USDA–ARS, at Fort Collins, CO, and at Salinas, CA, in cooperation with the Beet Sugar Development Foundation, Denver, CO. FC220 and FC221 are multigerm sugarbeet germplasm in fertile cytoplasm, segregating for self-fertility and hypocotyl color. Both have resistance to root-rotting strains (AG-2-2) of Rhizoctonia solani Kühn and are segregating for the Rz1 gene, which confers resistance to some strains of Beet necrotic yellow vein virus, the causal agent of rhizomania. These germplasm have moderate resistance to Aphanomyces cochlioides Drechs., which causes aphanomyces root rot (aphanomyces black root). FC221 is moderately resistant to curly top caused by Beet severe curly top virus. FC220 is resistant to the sugarbeet root aphid (Pemphigus sp.). Both germplasm are moderately susceptible to cercospora leaf spot, caused by Cercospora beticola Sacc. FC220 and FC221 have favorable yield characteristics when evaluated as lines or in experimental hybrids under rhizomania conditions at Salinas, CA. Under these conditions, FC220, as a line and in hybrid combinations, had a slight to significantly higher sucrose concentration than FC221.

Abbreviations: BNYVV, Beet necrotic yellow vein virus • BSDF, Beet Sugar Development Foundation • CLS, cercospora leaf spot • CMS, cytoplasmic male sterile • DI, disease index • HS, half-sib • MR, mother roots • MS, male sterile • PF, pollen fertile