Germplasm: AKER_12193

AKER_12193

PI 664914

https://doi.org/10.15454/FWGHQZ

Breeding/research material

EL59 is a broad genetic base diploid selected for tolerance to sugar beet cyst nematode (SBCN) from a series of selections out of breeding material from USDA-ARS Salinas, CA and advanced breeding materials from USDA-ARS East Lansing, MI, developed under the same pedigree as the released germplasm EL58. The seed parent of EL59 is an unreleased legacy breeding line labeled as possessing tolerance to Sclerotium rolfsii (EL-A010307).

Development of EL59 parallels that of EL58 with the exception that seed was harvested from 43 mother roots of an unreleased Sclerotium rolfsii tolerant legacy East Lansing, MI germplasm in the 2007 greenhouse polycross. Briefly, EL59 was selected in Michigan from 15 breeding populations initially selected under severe sugar beet cyst nematode (SBCN) pressure in Brawley, CA and then under three cycles moderate SCBN pressure in Michigan, with inter-mating of selected mother roots. In 2007, five East Lansing breeding germplasms were also included in a large random mated population, with seed harvested from the maternal donors (e.g. from the 43 mother roots leading to EL59) and tested separately. EL59, tested as EL-A022784 in 2009, was susceptible to Rhizoctonia (Ft. Collins, CO 5.5 vs. 6.2 for the commercial susceptible check), resistant to Aphanomyces (Shakopee, MN 4.0 vs. 4.5 for the resistant check), and susceptible to Cercospora leaf spot (Frankenmuth, MI 4.5 vs. 5.5 for the susceptible check). EL-A022784 yielded 26.4 tons/ acre with 16.7% sucrose content in a Michigan agronomic trial in 2009. In a 2010 Michigan nematode nursery selection plot, EL-A022784 yielded well as measured by plot weight. Seed of EL-A022784 was increased without selection and designated EL-A029768, which is being released as EL59.

United States of America