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To assess the host range?which plants are susceptible to infection?the research
team conducted extensive greenhouse trials. Over 1,800 samples of cereal crop
species like wheat, oats, barley, and rye; 110 grass species; and 16 species in the
ornamental shrub and buckthorn families were evaluated for their response to Pcc.
The researchers found:
● No cereal crops or turfgrasses were found to be susceptible to Pcc.
● In addition to reed canarygrass, 12 other grass species were found susceptible
to Pcc? some native to Minnesota or North America, some highly weedy.
● Three native North American buckthorn species were also susceptible to the
pathogen.
"It is highly valuable to predict what plants might be affected by a new pathogen and
to understand the host ranges of rust fungi more broadly," said Nick Greatens, a
recent U of M doctoral graduate. "Fortunately, no important crops or turfgrasses are
affected by Pcc. Locally, the pathogen has apparently positive effects, knocking back
some highly weedy plant species. The benefit to an ecosystem will depend on the
local plant community."
Future work will quantify the effects on invasive reed canarygrass and glossy
buckthorn in greenhouse experiments. Efforts are ongoing to document the
occurrence of various crown rust fungi on buckthorns and wild grasses across
Minnesota.
More information: Nicholas Greatens et al, Aecial and Telial Host Specificity of
Puccinia coronata var. coronata, a Eurasian Crown Rust Fungus of Two Highly
Invasive Wetland Species in North America, Plant Disease (2023). DOI:
10.1094/PDIS-04-23-0776-RE
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team conducted extensive greenhouse trials. Over 1,800 samples of cereal crop
species like wheat, oats, barley, and rye; 110 grass species; and 16 species in the
ornamental shrub and buckthorn families were evaluated for their response to Pcc.
The researchers found:
● No cereal crops or turfgrasses were found to be susceptible to Pcc.
● In addition to reed canarygrass, 12 other grass species were found susceptible
to Pcc? some native to Minnesota or North America, some highly weedy.
● Three native North American buckthorn species were also susceptible to the
pathogen.
"It is highly valuable to predict what plants might be affected by a new pathogen and
to understand the host ranges of rust fungi more broadly," said Nick Greatens, a
recent U of M doctoral graduate. "Fortunately, no important crops or turfgrasses are
affected by Pcc. Locally, the pathogen has apparently positive effects, knocking back
some highly weedy plant species. The benefit to an ecosystem will depend on the
local plant community."
Future work will quantify the effects on invasive reed canarygrass and glossy
buckthorn in greenhouse experiments. Efforts are ongoing to document the
occurrence of various crown rust fungi on buckthorns and wild grasses across
Minnesota.
More information: Nicholas Greatens et al, Aecial and Telial Host Specificity of
Puccinia coronata var. coronata, a Eurasian Crown Rust Fungus of Two Highly
Invasive Wetland Species in North America, Plant Disease (2023). DOI:
10.1094/PDIS-04-23-0776-RE
- 363 -
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