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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 #404032
Research Project: Genetic Enhancement of Sunflower Yield and Tolerance to Biotic Stress

Location: Sunflower and Plant Biology Research

Title: Registration of HA-R20 and HA-R21 confection sunflower germplasms resistant to rust and downy mildew

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

Submitted to: Journal of Plant Registrations
Publication Type: Germplasm Registration
Publication Acceptance Date: 6/16/2023
Publication Date: 9/14/2023
Citation: Guojia, M., Xuehui, L., Seiler, G.J., Qi, L. 2023. Registration of HA-R20 and HA-R21 confection sunflower germplasms resistant to rust and downy mildew. Journal of Plant Registrations. https://doi.org/10.1002/plr2.20324.
DOI: https://doi.org/10.1002/plr2.20324

Interpretive Summary:

Technical Abstract: Rust and downy mildew (DM) are two detrimental diseases in global sunflower (Helianthus annuus L.) production. Disease often results in yield loss and reduced seed quality. Host resistance to DM and rust is mediated by single dominant genes in sunflower. To better utilize genetic resistance, gene pyramiding is a common practice in crop breeding to extend the durability and longevity of resistance. Two confection sunflower germplasm lines HA-R20 (Reg. No. xxxxx, PI 702361) and HA-R21 (Reg. No. XXXXX, PI 702362) were developed using the pedigree breeding method and DNA marker-assisted selection and released by the USDA-ARS Sunflower and Plant Biology Research Unit in collaboration with the North Dakota Agricultural Experiment Station in September 2022. HA-R20 is a F3-derived F4 confection restorer selection from the cross of HA-DM2 and HA-R8, carrying rust resistance genes R12 and R15, and DM resistance gene PlArg. HA-R21 is a F3-derived F4 confection maintainer selection from the cross of HA-DM3 and HA-R8, carrying rust resistance genes R13a and R15, and DM resistance gene Pl17. Disease reaction and marker testing for DM and rust confirmed that both germplasms harbor DM and rust R genes in the homozygous condition and are resistant to all DM and rust races identified in North America to date. These multiple disease-resistant lines will provide the sunflower industry with durable disease resistant sources for the continued improvement of the crop.