The sunflower downy mildew pathogen <i><scp>P</scp>lasmopara halstedii</i>

Gascuel, Quentin; Martinez, Yves; Boniface, Marie‐Claude; Vear, Félicity; Pichon, Magalie; Godiard, Laurence

doi:10.1111/mpp.12164

Cited by 79 publications

(107 citation statements)

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“…Races of Plasmopara halstedii isolates collected in June 2014 were specified according to a proposed nomenclature based on the virulence profile of a given isolate on 15 sunflower differential lines selected according to their resistance/susceptibility patterns (Tourvieille de Labrouhe et al 2012;Gascuel et al 2015). This differential set of sunflowers is specified in Table 1.…”

Section: Resultsmentioning

confidence: 99%

“…where: P -total degree of infection; n -number of seedlings in each infection degree; v -infection degree (0-3 for seedlings); x -scale range = 3; n -total number of assessed seedlings Subsequently the susceptibility/resistance of an isolate was recognised (degree of infection ≥ 50% → susceptibility; ≤ 10 → resistance; 10-50% → repetition of the experiment) and corresponding race of each isolate determined according to virulence phenotype under the rules of the proposed five-digit coding system (Gascuel et al 2015).…”

Section: Methodsmentioning

confidence: 99%

“…To determine the race of P. halstedii, isolate seedlings were inoculated according to the soil drenching method (Goosen & Sackston 1968) using a set of 15 differential lines of sunflower (Gascuel et al 2015). An overview of the differential set together with the present resistance genes is given in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…Currently, ca. 20 downy mildew resistance genes (Pl 1 -Pl 17 , Pl 21 , and Pl aRG ) have been characterised from cultivated and wild species of sunflowers (Gascuel et al 2015;Qi et al 2015). Their utilisation in resistance breeding accelerates microevolution of the oomycete as new races with complex virulence formulas emerge.…”

mentioning

confidence: 99%

“…Permanent changes in pathogen virulence have been reflected by modifications in the sunflower differential set (Tourvieille de Labrouhe et al 2000. The tentatively adopted set consists of fifteen sunflower differential lines gathered in five triplets and P. halstedii races are designated by a five-digit code (Gascuel et al 2015). Despite a long lasting discussion the six additional lines proposed by French researchers have yet to be internationally endorsed, hopefully during the upcoming International Sunflower Association meeting in Turkey (2016).…”

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confidence: 99%

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First Report of Plasmopara halstedii New Races 705 and 715 on sunflower from the Czech Republic - Short Communication

Sedlářová¹,

Pospíchalová²,

Trojanová³

et al. 2016

Plant Prot. Sci.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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First Report of Plasmopara halstedii New Races 705 and 715 on sunflower from the Czech Republic - Short Communication

Sedlářová¹,

Pospíchalová²,

Trojanová³

et al. 2016

Plant Prot. Sci.

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Registration of two confection sunflower germplasms, HA‐DM5 and HA‐DM6, resistant to sunflower downy mildew

Seiler

2020

J of Plant Registrations

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Downy mildew (DM) is a primary biotic threat to sunflower (Helianthus annuus L.) production worldwide, negatively impacting yield. Germplasms HA‐DM5 (Reg. no. GP‐367, PI 687025) and HA‐DM6 (Reg. no. GP‐368, PI 691507) were developed and released through the collaboration of the USDA‐ARS and the North Dakota State University as new sources of resistance to downy mildew for confection sunflower. The backcross breeding method and DNA marker‐assisted selection were used to develop HA‐DM5 and HA‐DM6. HA‐DM5 is a BC2F3‐derived BC2F4 maintainer selection from the cross of CONFSCLB1*2//CMS CONFSCLB1/ PI 435414 with the DM resistance transferred from a wild H. annuus PI 435414. Phenotypic/molecular characterizations confirmed the presence of the DM resistance gene Pl19 located on sunflower chromosome 4 derived from PI 435414 in HA‐DM5. HA‐DM6 is a composite of seed from individual BC2F4 plants from the cross of CONFSCLB1*2//CMS CONFSCLB1/ PI 494576. The DM resistance in HA‐DM6 is controlled by a single dominant gene Pl35 located on chromosome 1 derived from wild H. argophyllus PI 494576. Both HA‐DM5 and HA‐DM6 confer resistance to several modern P. halstedii races currently identified in the United States and Europe. They provide new genetic diversity in addition to the few currently used DM‐resistant inbred lines in confection sunflower ensuring protection from yield loss.

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Registration of two oilseed sunflower germplasms HA‐DM7 and HA‐DM8 resistant to sunflower downy mildew

Seiler

2022

J of Plant Registrations

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Downy mildew (DM) is one of the most destructive diseases in sunflower (Helianthus annuus L.) production worldwide that limits yield and reduces seed quality. The oilseed sunflower germplasms HA-DM7 (Reg. no. GP-375, PI 691508) and HA-DM8 (Reg. no. GP-376, PI 698192) were developed using backcrossing, pedigree breeding, and DNA marker-assisted selection for DM resistance. They were released by the USDA-ARS, Sunflower and Plant Biology Research Unit in collaboration with the North Dakota Agricultural Experiment Station in July 2019 and March 2020, respectively. HA-DM7 is a BC 2 F 3 -derived BC 2 F 4 oilseed maintainer selection from the cross of HA 89*2//NMS HA 89/PI 494578, and HA-DM8 is a BC 2 F 5 -derived BC 2 F 6 oilseed maintainer selection from the cross of HA 89*2//NMS HA 89/PI 494576. HA-DM7 harbors the DM R gene Pl 20 mapped to sunflower chromosome 8, while HA-DM8 harbors the DM R gene Pl 35 on sunflower chromosome 1. Both genes were derived from wild sunflower species Helianthus argophyllus accessions, PI 494578 and PI 494576, respectively, both having broadspectrum resistance to the most predominant and virulent Plasmopara halstedii races identified in North America and Europe. Phenotypic and molecular testing confirmed that HA-DM7 and HA-DM8 germplasms are homozygous for the DM gene.These DM-resistant oilseed sunflower germplasms will expand the genetic pool for sunflower breeding projects globally, protecting sunflower production from yield losses.

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The sunflower downy mildew pathogen Plasmopara halstedii

Abstract: http://www.heliagene.org/HP, http://lipm-helianthus.toulouse.inra.fr/dokuwiki/doku.php?id=start, https://www.heliagene.org/PlasmoparaSpecies (soon available).

Cited by 79 publications

References 70 publications

First Report of Plasmopara halstedii New Races 705 and 715 on sunflower from the Czech Republic - Short Communication

First Report of Plasmopara halstedii New Races 705 and 715 on sunflower from the Czech Republic - Short Communication

Registration of two confection sunflower germplasms, HA‐DM5 and HA‐DM6, resistant to sunflower downy mildew

Registration of two oilseed sunflower germplasms HA‐DM7 and HA‐DM8 resistant to sunflower downy mildew

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