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Registration of Sugar Beet Germplasm Lines CN921-515 and CN921-516 with Sugar Beet Cyst Nematode Resistance from Beta vulgaris subsp maritima

Registration of Sugar Beet Germplasm Lines CN921-515 and CN921-516 with Sugar Beet Cyst Nematode Resistance from Beta vulgaris subsp maritima

Journal of Plant Registrations 12(2): 264-269

CN921-515 (Reg. No. GP-295, PI 669447) and CN921-516 (Reg. No. GP-296, PI 669448) sugar beet (Beta vulgaris L.) germplasm lines, with sugar beet cyst nematode (SBCN) resistance derived from Beta vulgaris subsp. maritima L. (Bvm), were developed and released by the USDA-ARS at Salinas, CA, in cooperation with the Beet Sugar Development Foundation in Denver, CO. CN921-515 and CN921-516 are multigerm, green hypocotyl, self-fertile, partially inbred lines extracted from genetic-male-sterile facilitated, random-mated lines. Greenhouse SBCN screening of individual plants and progeny tests indicate each is likely homozygous resistant. CN921-306 is the progenitor population and was developed from multiple composite crosses involving >40 Bvm accessions. Therefore, the original wild beet accession that contributed sugar beet cyst nematode resistance to these lines is not known, nor are the allelic relationships with recently released CN12-446, CN12-770, and CN72-652. CN921-515 and CN921-516 have a higher frequency of SBCN resistance (higher number of resistant individuals per line) than CN921-306. CN921-515 and CN921-516 also have an increased number of rhizomania-resistant individuals compared with CN921-306.

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