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Title: NOTICE OF RELEASE OF FC724 MONOGERM, O-TYPE SUGARBEET GERMPLASM

Author
item Panella, Leonard
item Hanson, Linda

Submitted to: Germplasm Release
Publication Type: Germplasm Release
Publication Acceptance Date: 4/15/2003
Publication Date: 4/15/2003
Citation: PANELLA, L.W., HANSON, L.E. NOTICE OF RELEASE OF FC724 MONOGERM, O-TYPE SUGARBEET GERMPLASM. GERMPLASM RELEASE. 2003.

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

Technical Abstract: FC274 has high resistance to root-rotting strains (AG-2-2) of Rhizoctonia solani Kuhn and good to moderate resistance to cercospora leaf spot caused by Cercospora beticola Sacc., but is curly top susceptible. FC724 is an attempt to develop a population from which to select Rhizoctonia resistant monogerm O-type parents to infuse some rhizoctonia resistance on the female side of hybrids. There is no CMS equivalent. FC724 is released from seed production 961014. FC724 is an O-type germplasm with 12% green hypocotyls (116 plants counted) and is segregating for monogerm (mm). It is a product of 9 generations of cyclic mass selection for resistance to rhizoctonia root rot and 2 cycles of recurrent selection for high general combining ability. It originated from a cross of FC702 by selfed progeny lines from FC601/2 and selfed progeny lines from several leaf spot and the beet curly top virus (BCTV) resistant lines combined in 611100-0 (SLC122-0, US22/3, US201, US22/4[SL92], SL202 [F2 of US35/2 x US22/4]). FC6012/2 consists of selected progeny lines from SL202 x SLC122-0. The original cross was approximatley 20% 611100-0, 17% FC 601/2 and 63% FC702. Because the original crosses were made to male sterile plants (genetic male sterility - aa), it is possible that FC724 is segregating for genetic male sterility, but no male sterile plants were observed in the last seed production (961014).