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Effect of physio-chemical seed treatments on opium poppy downy mildews caused by Peronospora meconopsidis and P. somniferi


Thangavel, T and Scott, J and Jones, S and Gugalothu, R and Wilson, C, Effect of physio-chemical seed treatments on opium poppy downy mildews caused by Peronospora meconopsidis and P. somniferi, PLoS ONE, 15, (4) Article 0230801. ISSN 1932-6203 (2020) [Refereed Article]


Copyright Statement

Copyright 2020 Thangavel et al. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

DOI: doi:10.1371/journal.pone.0230801


Downy mildew of opium poppy is the single biggest disease constraint afflicting the Australian poppy industry. Within the pathosystem, the transmission of infections via infested seed is of major concern. Both downy mildew pathogens of poppy; Peronospora meconopsidis and P. somniferi, are known contaminants of commercial seed stocks. Using seed naturally infested with these pathogens, the effect of physio-chemical seed treatments on seedling health and disease transmission were evaluated. Individual seed treatments were tested to determine optimal treatment parameters for each; including incubation time, temperature and treatment concentration. Optimised physiochemical treatments were then compared. The most effective treatment methods were seed washes in acidified electrolytic water (400 ppm hypochlorous acid for 5 min) and hypochlorite solution (2% NaOCI for 5 min). In seed to seedling transmission assays, these two treatments reduced transmission of P. somniferi by 88.8% and 74.61%, and P. meconopsidis by 93.3% and 100%, respectively. These methods are recommended for seed treatment of commercial opium poppy seed to assist in the control of the downy mildew diseases.

Item Details

Item Type:Refereed Article
Keywords:poppy downy mildew, Peronspora
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant pathology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Industrial crops
Objective Field:Plant extract crops
UTAS Author:Thangavel, T (Dr Tamil Thangavel)
UTAS Author:Scott, J (Dr Jason Scott)
UTAS Author:Jones, S (Dr Suzie Jones)
UTAS Author:Gugalothu, R (Ms Ramya Gugulothu)
UTAS Author:Wilson, C (Professor Calum Wilson)
ID Code:139328
Year Published:2020
Funding Support:Australian Research Council (LP160100758)
Web of Science® Times Cited:1
Deposited By:TIA - Research Institute
Deposited On:2020-06-09
Last Modified:2022-12-06
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