Germplasm: AKER_12171

AKER_12171

PI 663212

https://doi.org/10.15454/VLBRAK

Breeding/research material

EL57 is a very broad genetic base diploid with the unique feature that 98% of the 133 parental lines are self-fertile due to a dominant gene (Sf) introgressed from C869 (PI 628754) or its C869 CMS (PI 628755). 21% of the parents were derived from C869 CMS and have the S-cytoplasm. Male sterility, both nuclear male sterility from C869 and CMS, was used to capture pollen from open-pollinated increases of a wide variety of pollinators from 1997 to 2007.

EL57 is a unique synthetic population combining mostly Eastern US germplasm traits in a self-fertile genetic background. EL57 is being released as a source population from which to extract inbreds for use in making hybrids and as a vehicle for deducing the genetic basis of traits by selfing selected mother roots and examining segregation among their progeny. Traits expected to be segregating in the population include Aphanomyces seedling disease and Cercospora leaf spot resistances contributed by sugarbeet germplasms SP7622 (aka SP6822, 20% of original pollinators), USH20 (8% of original pollinators), and SP85303 (PI 590770, 6% of original pollinators), Rhizoctonia resistance derived from EL51 (PI 598074, 13% of original pollinators), curly top and rhizomania resistance selections from C931 (PI 636340) and EL0204 (PI 655951) (5% of original pollinators), a series of Aphanomyces resistant or salt-tolerant germination breeding lines and selections (derived from PI 165485, PI 271439, PI 518160, PI 546409, PI 562591, PI 562599, and PI 562601) (20% of original pollinators in total), a series of 17 nematode resistant breeding lines from the Salinas, CA USDA-ARS breeding program (13% of original pollinators), and a mixture of released and unreleased breeding lines derived from high sucrose, smooth-root selections (23% of original pollinators). Seed from hybrids of these materials crossed with male sterile, self-fertile C869 and derivative breeding lines was sown in the 2006 Rhizoctonia seedling and crown and root rot nursery, Cercospora leaf spot nursery, or the Michigan State University campus evaluation nursery, and 660 mother roots (four to six roots per entry) were harvested and selected on the basis of size, shape, freedom from disease, vernalized at 4o C for eight months, transplanted to a field seed increase plot, and allowed to randomly inter-pollinate. Seed was harvested in bulk from this group, and forms EL57.

United States of America