Comparison of disease severity caused by four soil-borne pathogens in winter cereal seedlings
Ahmed Saad
A , Bethany Macdonald B , Anke Martin A , Noel L. Knight A C and Cassandra Percy A D
+ Author Affiliations
- Author Affiliations
A Centre for Crop Health, University of Southern Queensland, Toowoomba, Qld 4350, Australia.
B Leslie Research Facility, Queensland Department of Agriculture and Fisheries, Toowoomba, Qld 4350, Australia.
C Current address: Centre for Crop and Disease Management, School of Molecular and Life Sciences, Curtin University, Bentley, WA 6102, Australia.
D Corresponding author. Email: cassy.percy@usq.edu.au
Crop and Pasture Science 72(5) 325-334 https://doi.org/10.1071/CP20245
Submitted: 12 July 2020 Accepted: 15 March 2021 Published: 20 May 2021
Journal Compilation © CSIRO 2021 Open Access CC BY
Abstract
In Australia, crown rot of cereals is predominantly caused by Fusarium pseudograminearum and Fusarium culmorum, and common root rot by Bipolaris sorokiniana. Fusarium graminearum is an important pathogen causing Fusarium head blight worldwide and has also been reported to cause crown rot of wheat. The comparative ability of F. pseudograminearum, F. culmorum, F. graminearum and B. sorokiniana to cause crown rot and common root rot across a range of winter cereal species requires investigation. In glasshouse trials, we inoculated one cultivar each of barley, bread wheat, durum wheat, oat and triticale with two strains of each of the four pathogens. At 21 days after inoculation, the sub-crown internode and leaf sheaths of each plant were visually rated for brown discoloration. Shoot length and dry weight of inoculated plants were compared with those of non-inoculated controls. Barley and bread wheat had the highest disease severity ratings on leaf sheaths and sub-crown internode (64.7–99.6%), whereas oat had the lowest disease severity ratings across all pathogens (<5%). The shoot length of all cultivars was significantly reduced (by 12.2–55%, P < 0.05) when exposed to F. pseudograminearum. This study provides a comparison of pathogenicity of crown rot and common root rot pathogens and demonstrates significant variation in visual discoloration and host response across a range of winter cereals.
Keywords: barley, Bipolaris, crown rot, Fusarium, oat, triticale, wheat.
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