Whole-genome sequencing enables molecular dissection and candidate gene identification of the rust resistance gene R12 in sunflower (Helianthus annuus L.)

J, G; Talukder, Zahirul I.; Song, Qijian; Li, X H; Qi, Lili

doi:10.1007/s00122-023-04389-9

Cited by 1 publication

(1 citation statement)

References 24 publications

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“…The confection sunflower lines HA-DM2 with the rust and DM R genes R 12 and Pl Arg and HA-DM3 with R 13a and Pl 17 genes were released in 2017 by USDA and North Dakota State University (Ma et al, 2019a). Molecular markers closely linked to R 12 in sunflower linkage group (LG)11, R 13a in LG13, Pl Arg in LG1, and Pl 17 in LG4 have been developed to facilitate marker-assisted gene pyramiding (Ma et al, 2019b(Ma et al, , 2022(Ma et al, , 2023Qi et al, 2017). The inbred line HA-R8 harbors the rust gene R 15 mapped to LG8 with tightly linked DNA markers (Ma et al, 2018;Qi & Ma, 2020).…”

Section: Introductionmentioning

confidence: 99%

Registration of HA‐R20 and HA‐R21 confection sunflower germplasms resistant to rust and downy mildew

Ma,

Li,

Seiler

et al. 2023

J of Plant Registrations

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Rust and downy mildew (DM) are 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. GP‐387, PI 702361) and HA‐R21 (Reg. no. GP‐388, 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 an 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 an 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.

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