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Title: Notice of release of FC723 Monogerm Sugarbeet Germplasm

Author
item Panella, Leonard
item Hanson, Linda

Submitted to: Germplasm Release
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 1/27/2006
Publication Date: 1/27/2006
Citation: Panella, L.W., Hanson, L.E. 2006. Notice of Release of FC723 monogerm sugarbeet germplasm. Crop Science Registration.

Interpretive Summary: This is a Germplasm Release, no Interpretive Summary required.

Technical Abstract: The USDA Agricultural Research Service (ARS), in cooperation with the Beet Sugar Development Foundation (BSDF), announces the release of FC723 and FC723CMS (PI 639917 and PI 639918, respectively) sugarbeet germplasm. These germplasm were developed in the breeding program of Drs. L. Panella and L. E. Hanson, USDA-ARS, Fort Collins, Colorado. FC723 has good resistance to root-rotting strains (AG-2-2) of Rhizoctonia solani Kühn and intermediate resistance to cercospora leaf spot caused by Cercospora beticola Sacc., but is not resistant to the Beet curly top virus (BCTV). FC723 is a population from which to select rhizoctonia and cercospora resistant, monogerm, O-type parents to infuse some rhizoctonia and leaf spot resistance on the female side of hybrids, and FC723CMS provides a CMS female with these characteristics. FC723 is released from seed production 951016HO and FC723CMS from 951016HO1. FC723 is an O-type germplasm with 100% pink (R_) hypocotyls (89 plants counted) and is segregating for monogerm (94% mm). FC723 has FC708 (PI 590845), a rhizoctonia- and cercospora-resistant monogerm O-type release from the Fort Collins program as one parent. The other parent, EL44 (PI 590855), is a germplasm released from the USDA-ARS sugarbeet improvement program in East Lansing, MI, which was selected for curly top resistance and characters which enhance pollen and seed production. FC723 is a product of five generations of mass selection for rhizoctonia resistance. It was strongly selected for monogerm and the smallest population size was 12 individuals. FC723CMS is the genetic-cytoplasmic male sterile (CMS) equivalent of FC723 backcrossed seven times. It has 100% pink (R_) hypocotyls (51 plants counted) and is segregating for monogerm (90% mm). The original cross was EL44CMS (PI 590856)/ FC708. It was backcrossed continually to the populations, from which FC723 was derived, and went through five generations of cyclic mass selection for rhizoctonia root rot resistance.