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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 #399369

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

Location: Sunflower and Plant Biology Research

Title: Registration of HA-DM12, HA-DM13 and HA-DM14 oilseed sunflower germplasms with resistance to sunflower downy mildew and rust

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: 3/7/2023
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Downy mildew (DM) and rust are two major global sunflower diseases causing significant yield losses and reducing seed quality. Host plant resistance mediated by dominant race-specific genes has been extensively used in sunflower production to control these diseases. However, the considerable variability of the DM and rust pathogens caused by mutation or recombination, has changed the dynamics of the diseases, significantly increasing their incidence in recent years. This necessitates the development and release of sunflower germplasm with enhanced levels of disease resistance. Germplasm lines, HA-DM12 (Reg. No. ______, PI), HA-DM13 (Reg. No. ______, PI), and HA-DM14 (Reg. No. ______, PI) with multiple DM- and rust-resistance were developed using phenotypic evaluation and marker-assisted selection. The three lines share a common DM gene PlArg and a rust gene R12, and a combination of different DM genes, Pl8, Pl17, and Pl18, respectively. The triple-gene pyramids, HA-DM12 (Pl8Pl8/PlArgPlArg/R12R12), HA-DM13 (Pl17Pl17/PlArgPlArg/R12R12), and HA-DM14 (Pl18Pl18/PlArgPlArg/R12R12) confer comprehensive resistance to all known races of the DM and rust identified so far and can be used in sunflower breeding programs to develop hybrids with durable resistance to DM and rust.