Germplasm: AKER_8487

AKER_8487

PI 655308

https://doi.org/10.15454/OS3NYX

Wild

EL-X4 (4PS1929) is from the cross between a single WB879 plant and the same 6869 plant used for EL-X3. Seed from this cross was planted in the 1998 observation nursery in Saginaw, MI, and seven roots were selected on plant vigor, and selfed seed was produced in the 1999 greenhouse. That seed was provided for the Shakopee Aphanomyces nursery, and seed was produced from selections within the nursery that had low disease incidence and improved root shape (e.g. lack of sprangled roots).

WB879, a wild Beta vulgaris spp. maritima accession (PI 540625) collected in 1989 on the coast of Brittany, France, was used as the wild beet donor germplasm in EL-X4. WB879 was used because its potential resistance to Aphanomyces diseases caused by Aphanomyces cochlioides by having a disease score of 1 (resistant) (rating system of 0-9 scale with 0 showing no symptoms and 9 being dead) in the 1994 Beta germplasm evaluation nursery. EL-X4 is not currently suitable for variety development since it still has many characteristics of wild materials, however it has some improvement in taproot characteristics relative to the wild accession. In 2003, EL-X4 was tested in the Shakopee Aphanomyces nursery and rated on a 1 (resistant) to 9 (susceptible) scale. The average rating of two Aphanomyces tolerant and two susceptible standards was 2.0 and 7.0, respectively (LSD(0.05)=1.83, average of two late readings), the sugar beet parent 6869 had score 5.5, and EL-X4 scored 3.8.

United States of America