139328 - Effect of physio-chemical seed treatments on opium poppy downy mildews caused by Peronospora meconopsidis and P. somniferi.pdf (638.55 kB)
Effect of physio-chemical seed treatments on opium poppy downy mildews caused by Peronospora meconopsidis and P. somniferi
journal contribution
posted on 2023-05-20, 14:56 authored by Thangavel, T, Jason ScottJason Scott, Suzanne JonesSuzanne Jones, Gugalothu, R, Calum WilsonCalum WilsonDowny 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.
Funding
Australian Research Council
Department of Natural Resources and Environment Tasmania
Poppy Growers Tasmania Inc
SunPharma Australia
Tasmanian Alkaloids Pty Ltd
History
Publication title
PLoS ONEVolume
15Issue
4Article number
0230801Number
0230801Pagination
1-18ISSN
1932-6203Department/School
Tasmanian Institute of Agriculture (TIA)Publisher
Public Library of SciencePlace of publication
United StatesRights statement
Copyright © 2020 Thangavel et al. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/Repository Status
- Open