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Host range of Peronospora somniferi and Pe. meconopsidis within selected members of the Papaveraceae under controlled conditions

Citation

Krishnamoorthy, K and Thangavel, T and Jones, SJ and Scott, JB and Wilson, CR, Host range of Peronospora somniferi and Pe. meconopsidis within selected members of the Papaveraceae under controlled conditions, Journal of Phytopathology pp. 1-10. ISSN 0931-1785 (2020) [Refereed Article]

Copyright Statement

2020 Wiley-VCH GmbH

DOI: doi:10.1111/jph.12947

Abstract

Opium poppy, belonging to the family Papaveraceae, is grown for its alkaloid compounds of pharmaceutical value. Downy mildew caused by Peronospora somniferi and Pe. meconopsidis, substantially impacts crop production. The present study was conducted to identify the host range of Pe. somniferi and Pe. meconopsidis within selected weed and ornamental members of the Papaveraceae family. Nine Papaver spp., Meconopsis cambrica and a nonhost control (tomato, Solanum lycopersicum) were challenged with both pathogens under controlled glasshouse or laboratory conditions using infested soil or foliar applied sporangia as inocula. Peronospora somniferi and Pe. meconopsidis induced disease symptoms, including sporulation, in at least one trial for all tested species except for Pa. atlanticum and tomato. Species‐specific PCR testing of foliage of challenged plants confirmed infections by both pathogen species of symptomatic plants, identifying these as hosts. Positive PCR tests were also obtained from Pa. atlanticum plants for both pathogens. However, in the absence of pathogen sporulation structures as further evidence of infection, the host status of Pa. atlanticum remains inconclusive. Testing of seeds collected from Pe. somniferi and Pe. meconopsidis infected plants of Pa. somniferum, Pa. dubium, Pa. rhoeas and Pa. nudicaule showed presence of both pathogens, indicating likely ability for seed transmission in these species. We identified new hosts of these pathogens and discuss potential implications of these alternative hosts in pathogen survival, dissemination and epidemic initiation.

Item Details

Item Type:Refereed Article
Keywords:alternative hosts, seed infestation, soil transmission, poppy, downy mildew, host range, papaver
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Crop and pasture production
Research Field:Crop and pasture protection (incl. pests, diseases and weeds)
Objective Division:Plant Production and Plant Primary Products
Objective Group:Industrial crops
Objective Field:Plant extract crops
UTAS Author:Krishnamoorthy, K (Mrs Krithika Krishnamoorthy)
UTAS Author:Thangavel, T (Dr Tamil Thangavel)
UTAS Author:Jones, SJ (Dr Suzie Jones)
UTAS Author:Scott, JB (Dr Jason Scott)
UTAS Author:Wilson, CR (Professor Calum Wilson)
ID Code:140781
Year Published:2020
Funding Support:Australian Research Council (LP160100758)
Deposited By:TIA - Research Institute
Deposited On:2020-09-07
Last Modified:2020-10-09
Downloads:0

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