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ACCESSIONPLANT NAMETAXONOMYORIGINGENEBANKIMAGEAVAILABILITYRECEIVEDSOURCE TYPESOURCE DATECOLLECTION SITECOORDINATESELEVATIONHABITATIMPROVEMENT LEVELNARRATIVE
0PI 691507HA-DM6Helianthus annuus L. North Dakota, United StatesNC7Not Available2019DEVELOPEDBreeding materialHA-DM6 is a BC2F3-derived BC2F4 confection maintainer selection from the cross of CONFSCLB1*2/CMS CONFSCLB1/Helianthus argophyllus accession PI 494576. CONFSCLB1 is a confection BC2F3-derived BC2F4 maintainer selection from the cross of HA 441/ROM PH//HA 442/HA 441/4/CONF/5/CONF. The line was released by the USDA-ARS and the North Dakota Agricultural Experiment Station in 2006 and is susceptible to downy mildew (caused by Plasmopara halstedii). The cytoplasmic male sterile (CMS) CONFSCLB1 was developed by substituting the nuclear genome of CONFSCLB1 into the background of a wild annual species H. petiolaris (CMS PET1). The wild annual Helianthus argophyllus accession (PI 494576) was originally collected in Texas in 1984, and is resistant to new virulent races of downy mildew. HA-DM6 was developed using the backcross breeding method and DNA marker-assisted selection for the Pl35 downy mildew resistance gene introgressed from wild H. argophyllus accession PI 494576. The cross between CMS CONFSCLB1 and PI 494576 was made in 2012 and the selected resistant F1 plants were backcrossed twice to CONFSCLB1. The BC2F3-derived HA-DM6 is homozygous for the Pl35 resistance gene verified by DNA markers and greenhouse downy mildew screening. HA-DM6 is immune to the most predominant and virulent races of downy mildew currently identified in the United States and Europe. Plant height of HA-DM6 was 174 cm compared to 178 cm for CONFSCLB1, and flowers in 88 days after planting compared to 81 days for CONFSCLB1 in the field nursery at Glyndon, MN during the summer of 2017. 2096610PI 691507
1PI 687025HA-DM5Helianthus annuus L. North Dakota, United StatesNC72018DEVELOPEDBreeding materialHA-DM5 is a BC2F3-derived BC2F4 confection maintainer selection from the cross of CONFSCLB1*2/CMS CONFSCLB1/Helianthus annuus accession PI 435414. CONFSCLB1 is a confection BC1F3-derived BC1F4 maintainer selection from the cross of HA 441/ROM PH//HA 442/HA 441/4/CONF/5/CONF. The line was released by the USDA-ARS and the North Dakota Agricultural Experiment Station in 2006 and is susceptible to downy mildew. The cytoplasmic male sterile (CMS) CONFSCLB1 was developed by substituting the nuclear genome of CONFSCLB1 into the background of a wild annual species H. petiolaris (CMS PET1). The wild annual H. annuus accession (PI 435414) was originally collected from Paris, Texas in 1978 and is resistant to new virulent races of downy mildew. HA-DM5 was developed using the backcross breeding method and DNA marker-assisted selection for the downy mildew resistance Pl19 gene introgressed from wild H. annuus PI 435414. The cross between CMS CONFSCLB1 and PI 435414 was made in 2013 and the selected resistant F1 plants were backcrossed twice to CONFSCLB1. The BC2F3-derived HA-DM5 is homozygous for the Pl19 gene verified by DNA markers and downy mildew greenhouse testing. HA-DM5 is immune to the most predominant and virulent races of downy mildew currently identified in the United States. Plant height of HA-DM5 was 171 cm compared to 149 cm for CONFSCLB1, and flowers in 77 days after planting compared to 79 days for CONFSCLB1 in the field nursery at Glyndon, MN during the summer of 2016.1958038PI 687025