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

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 cont...

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Veröffentlicht in:PloS one 2020-04, Vol.15 (4), p.e0230801
Hauptverfasser: Thangavel, Tamilarasan, Scott, Jason, Jones, Suzanne, Gugalothu, Ramya, Wilson, Calum
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description 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.
doi_str_mv 10.1371/journal.pone.0230801
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subjects Acidification
Airborne microorganisms
Australia
Biology and Life Sciences
Chlorine
Contaminants
Disease transmission
Downy mildew
Electrolytes - pharmacology
Experiments
Fungicides
Health services
Hypochlorous acid
Hypochlorous Acid - pharmacology
Infections
Laboratories
Medical treatment
Narcotics
Papaver
Papaver - microbiology
Papaver somniferum
Pathogens
Peronospora - drug effects
Peronospora - pathogenicity
Peronospora meconopsidis
Pesticides
Phylogeny
Physical Sciences
Physiochemistry
Plant diseases
Plant Diseases - microbiology
Plant Diseases - prevention & control
Research and Analysis Methods
Seed treatments
Seedlings
Seedlings - drug effects
Seedlings - microbiology
Seeds
Seeds - drug effects
Seeds - microbiology
Water treatment
title Effect of physio-chemical seed treatments on opium poppy downy mildews caused by Peronospora meconopsidis and P. somniferi
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