Registration of HA‐R14, HA‐R15, HA‐R16, and HA‐R17 oilseed sunflower germplasm with broad resistance to rust and downy mildew

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Abstract
Rust and downy mildew (DM) are two of the most important sunflower diseases in the world. The development of sunflower hybrids with enhanced levels of genetic resistance to both diseases is a goal for sunflower breeding. Four oilseed sunflower (Helianthus annuus L.) germplasm lines, HA‐R14 (Reg. no. GP‐371, PI 698193), HA‐R15 (Reg. no. GP‐372, PI 698194), HA‐R16 (Reg. no. GP‐373, PI 698195), and HA‐R17 (Reg. no. GP‐374, PI 698196) are multiple rust‐ and DM‐resistant lines that were developed and released by the USDA‐ARS Sunflower and Plant Biology Research Unit in collaboration with the North Dakota Agricultural Experiment Station in January 2020. Three lines, HA‐R14 (R4R4/R12R12/PlArgPlArg), HA‐R15 (R5R5/R12R12/PlArgPlArg), and HA‐R16 (R13bR13b/R12R12/PlArgPlArg), stack two different rust genes with a common DM gene PlArg, and HA‐R17 (R13bR13b/R15R15) possesses two rust genes, R13b and R15. These germplasm lines will provide a broad spectrum of useful sources of resistance to all known races of rust and DM.

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