Abstract
HA‐DM1 (Reg. No. GP‐335, PI 674793) sunflower (Helianthus annuus L.) germplasm was developed and released cooperatively by the USDA‐ARS, Sunflower and Plant Biology Research Unit and the North Dakota Agricultural Experiment Station in 2015. HA‐DM1 is a BC2F4–derived oilseed maintainer line from the cross HA 89*2/NMS HA 89/Helianthus argophyllus PI 494573, selected for resistance to downy mildew (DM) [caused by Plasmopara halstedii (Farl.) Berl. et de Toni], a destructive disease in sunflower. The DM resistance in HA‐DM1 originated from wild H. argophyllus accession PI 494573 and is conditioned by a single dominant gene designated Pl18. Pl18 has been mapped to linkage group 2 of the sunflower genome and is independent of all known identified DM resistance genes in sunflower. HA‐DM1 has resistance to all P. halstedii races identified in the United States to date, providing a potential new source for resistance to emerging virulent races of P. halstedii in sunflower in North America and around the world.
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