European Journal of Plant Pathology

, Volume 153, Issue 3, pp 915–929 | Cite as

Resistances to downy mildew (Hyaloperonospora brassicae) in diverse Brassicaceae offer new disease management opportunities for oilseed and vegetable crucifer industries

  • Akeel E. Mohammed
  • Ming Pei You
  • Surinder S. Banga
  • Martin J. BarbettiEmail author


Some 154 Brassicaceae genotypes (78 Brassica napus, 38 B. carinata, 25 B. juncea, three Raphanus sativus, two each of Rapistrum rugosum and B. incana and one each of Crambe abyssinica, B. fruticulosa, Hirschfeldia incana, B. insularis, B. oleracea and Sinapis arvensis), were inoculated with a mixture of seven isolates of Hyaloperonospora brassicae to identify effective host resistances. Many highly resistant genotypes were identified, particularly R. sativus Krasnodar Market B (%Disease index 6.6) and Pegletta (%DI 9.0); B. carinata Tamn Rex-sel Green (%DI 7.6), BRA926/18 (%DI 9.7) and PI360884 (%DI 9.7); and B. juncea, Ringot1 (%DI 9.7). A further 13 B. carinata, seven B. juncea and single R. sativus (Boss) and B. incana (UPM6563) genotypes were also highly resistant (%DI 11.1), as were B. oleracea CPI106844 (%DI 14.6) and Crambe abyssinica (%DI 17.4). Almost all B. carinata and B. juncea genotypes showed high resistance (%DI 7.6–22.2). In contrast, B. napus genotypes showed wide ranging responses, from high resistance in SN-8 (%DI 22.2%) to extreme susceptibility in Hyola 450TT and Thunder TT (%DI 83.7, 95.5, respectively). R. rugosum, B. fruticulosa, H. incana and B. insularis genotypes ranged from moderately to highly susceptible (%DI 55.2–78.8). This study highlights the ready availability of very high levels of pathotype-independent resistance across diverse Brassicaceae to H. brassicae, particularly R. sativus, B. carinata, B. juncea, B. oleracea and C. abyssinica. Resistances identified can be utilized as sources of resistance in oilseed and vegetable Brassicaceae breeding programs and/or directly deployed as new varieties where downy mildew is prevalent.


Hyaloperonospora brassicae Downy mildew Weedy crucifers Brassicaceae Brassica carinata B. napus B. juncea Host resistance 



The first author is grateful to the scholarship from the University of Kufa in Iraq. The authors are grateful for some additional financial support of the Grains Research and Development Corporation (GRDC) as this work is aligned with part of the GRDC UWA170 project ‘Emerging foliar diseases of canola’. We are very grateful to commercial seed companies for provision of Australian varieties of B. napus and B. juncea and to Huang Yi, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan, China, for seed of some Chinese genotypes. The exceptional technical support from Robert Creasy and Bill Piasini in the UWA Plant Growth Facilities is also gratefully acknowledged.

Compliance with ethical standards

Ethical approval

This research did not involve any animal and/or human participants.

Conflict of interest

The authors declare that they have no conflict of interests.


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Copyright information

© Koninklijke Nederlandse Planteziektenkundige Vereniging 2018

Authors and Affiliations

  • Akeel E. Mohammed
    • 1
    • 2
  • Ming Pei You
    • 1
  • Surinder S. Banga
    • 3
  • Martin J. Barbetti
    • 1
    Email author
  1. 1.UWA School of Agriculture and Environment and the UWA Institute of Agriculture, Faculty of ScienceThe University of Western AustraliaCrawleyAustralia
  2. 2.Department of Plant Protection, Faculty of AgricultureUniversity of KufaNajafIraq
  3. 3.Department of Plant Breeding and GeneticsPunjab Agricultural UniversityLudhianaIndia

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