Registration of an Oilseed Sunflower Germplasm HA-DM1 Resistant to Sunflower Downy Mildew
JOURNAL OF PLANT REGISTRATIONS(2016)
摘要
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 Pl(18).Pl(18) 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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