Effect of Physio-chemical Seed Treatments on Opium Poppy Downy Mildews Caused by Peronospora Meconopsidis and P. Somniferi

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2020 Apr 11

PMID 32275719

Authors

Tamilarasan Thangavel

Jason Scott

Suzanne Jones

Ramya Gugalothu

Calum Wilson

Affiliations

Soon will be listed here.

Abstract

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.

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