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ARS Home » Plains Area » Fargo, North Dakota » Edward T. Schafer Agricultural Research Center » Sunflower and Plant Biology Research » Research » Publications at this Location » Publication #398950

Research Project: Genetic Enhancement of Sunflower Yield and Tolerance to Biotic Stress

Location: Sunflower and Plant Biology Research

Title: Registration of HA-DM9, HA-DM10, and HA-DM11 oilseed sunflower germplasms with dual resistance to sunflower downy mildew

item Qi, Lili
item MA, GUOJIA - North Dakota State University
item Seiler, Gerald

Submitted to: Journal of Plant Registrations
Publication Type: Germplasm Registration
Publication Acceptance Date: 12/2/2022
Publication Date: 3/15/2023
Citation: Qi, L., Ma, G., Seiler, G.J. 2023. Registration of HA-DM9, HA-DM10, and HA-DM11 oilseed sunflower germplasms with dual resistance to sunflower downy mildew. Journal of Plant Registrations. 17(2):426-434.

Interpretive Summary: Cultivated sunflower is an important global oilseed crop, third in oilseed production, and fourth in vegetable oil consumption. Sunflower downy mildew (DM) is one of the most severe diseases affecting sunflower production worldwide. The use of plant resistance in sunflower is the most effective and environmentally sound means of controlling DM disease. However, due to the rapid change of pathogen populations, resistance genes in sunflower lines have been overcome in the field. Current efforts focus on stacking two effective resistance genes to extend the durability of resistances. Three germplasms, HA-DM9, HA-DM10, and HA-DM11, were developed by pyramiding two different DM resistance genes into each germplasm conferring resistance to all DM races currently occurring in North America and Europe. These germplasms will provide a broad spectrum of useful sources of DM resistance genes for sunflower breeding.

Technical Abstract: Downy mildew (DM) caused by the obligate pathogen Plasmopara halstedii (Farl.) Berl. & de Toni is a worldwide yield-limiting disease of sunflower (Helianthus annuus L.). To obtain durable DM resistance in sunflower hybrids, there is a need to stack new resistance genes into the best available germplasm. The DM resistance genes, Pl8, Pl17, and Pl18 were recently fine mapped to sunflower chromosomes 13, 4, and 2, respectively. The current study pyramided these genes into a single genotype by marker-assisted selection. Three oilseed sunflower germplasms, HA-DM9 (Reg. No. ______, PI 700009), HA-DM10 (Reg. No. ______, PI 700004), and HA-DM11 (Reg. No. ______, PI 700005) are dual DM-resistant germplasm lines developed and released by the USDA-ARS, Sunflower and Plant Biology Research Unit in collaboration with the North Dakota Agricultural Experiment Station in 2021. The three lines, HA- DM9 (Pl8Pl8/Pl17Pl17), HA- DM10 (Pl8Pl8/Pl18Pl18), and HA- DM11 (Pl17Pl17/Pl18Pl18) each stacked two different DM genes, providing broad resistance to all P. halstedii races identified in North America and Europe so far and can be used in sunflower breeding programs to enhance DM resistance.