|MCGRATH, J MITCHELL|
|Hogaboam, George - RETIRED ARS SCIENTIST|
Submitted to: Germplasm Release
Publication Type: Germplasm Release
Publication Acceptance Date: December 22, 2000
Publication Date: N/A
Interpretive Summary: This is a germplasm release. No Interpretive Summary is needed.
Technical Abstract: EL52 is a monogerm sugarbeet line combining moderate resistance to Rhizoctonia crown and root rot with excellent resistances to Cercospora leaf spot and Aphanomyces blackroot diseases. EL52 is enriched for the frequency of the recessive x and z alleles which, in the joint homozygous condition, maintain male sterility in plants possessing the sterile (S) cytoplasm. EL52 segregates for red and green hypocotyl plants, and is predominantly self-sterile: six percent of plants sampled were highly self- fertile. EL52 is a bulk of predominantly half-sib seed from 13 of 51 interpollinated plants that had been selected for freedom from disease and for root conformation in the 1997 East Lansing Rhizoctonia crown and root rot nursery. The 51 plants were selected from the six most resistant of 20 half-sib families evaluated in that 1997 nursery. Those 20 half-sib families originated on twenty plants of the half-sib family 85B1-R26, which hhad a selection background for cytoplasmic male sterility maintaining as well as resistances to Rhizoctonia crown and root rot and Cercospora leafspot diseases. EL52 would be useful in developing mongerm parental lines for hybrids resistant to several diseases of economic importance in the Great Lakes and Upper Midwest sugarbeet growing regions of the US.