Abstract
This study evaluated the reactions of seven common C 4 grasses of the tallgrass prairie of the USA G reat P lains to the economically important wheat pathogens P yrenophora tritici‐repentis and G aeumannomyces graminis var. tritici ( G gt) isolated from wheat. The P . tritici‐repentis isolates (race 1) were pathogenic on all grasses tested, but symptom severity was markedly low. Three of the grass species inoculated with G gt were highly susceptible, while four species exhibited no symptoms. Because measures of connectedness can provide a proxy for population processes, connectedness was evaluated within and among the seven grass species in representative tallgrass prairie environments for all potential pathogen‐sharing patterns. A ndropogon gerardii was ubiquitous, so all plant species were well connected to it. A ndropogon scoparius (= S chizachyrium scoparium ), S orghastrum nutans and P anicum virgatum were fairly common but specialized to particular environments. B outeloua curtipendula was uncommon but occurred in all environments, while B uchloë dactyloides and B outeloua gracilis were uncommon and only occurred in upland sites. Co‐occurrence of plant species was generally not reciprocal in that, for many species pairs, species A rarely occurred without potential exposure to inoculum from species B , while species B commonly occurred without species A . The three grass species susceptible to G gt may act as sources of inoculum for each other within tallgrass prairie, with the potential to influence fitness, and tallgrass prairie and commercial wheat ecosystems in the G reat P lains also have the potential to share both pathogens.
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Claims 10
Claim · model-written summary
Race 1 isolates were pathogenic on all seven grasses, with low symptom severity.
Verbatim
e0“The P . tritici‐repentis isolates (race 1) were pathogenic on all grasses tested, but symptom severity was markedly low.”
e1“seven common C 4 grasses”
Claim · model-written summary
Three grass species were highly susceptible to G gt.
Verbatim
e0“Three of the grass species inoculated with G gt were highly susceptible”
e1“seven common C 4 grasses”
Claim · model-written summary
Four grass species inoculated with G gt showed no symptoms.
Verbatim
e0“four species exhibited no symptoms”
e1“grass species inoculated with G gt”
Claim · model-written summary
Andropogon gerardii was ubiquitous, connecting all studied species to it.
Verbatim
e0“A ndropogon gerardii was ubiquitous, so all plant species were well connected to it.”
Claim · model-written summary
Three grasses were fairly common but specialized by environment.
Verbatim
e0“A ndropogon scoparius (= S chizachyrium scoparium ), S orghastrum nutans and P anicum virgatum were fairly common but specialized to particular environments.”
Claim · model-written summary
Bouteloua curtipendula was uncommon but occurred in all environments.
Verbatim
e0“B outeloua curtipendula was uncommon but occurred in all environments”
Claim · model-written summary
Buchloë dactyloides and Bouteloua gracilis were uncommon and confined to uplands.
Verbatim
e0“B uchloë dactyloides and B outeloua gracilis were uncommon and only occurred in upland sites”
Claim · model-written summary
Pairwise co-occurrence among grasses was generally asymmetric.
Verbatim
e0“Co‐occurrence of plant species was generally not reciprocal”
Claim · model-written summary
Three G gt susceptible grasses may be mutual inoculum sources in prairie.
Verbatim
e0“The three grass species susceptible to G gt may act as sources of inoculum for each other within tallgrass prairie”
Claim · model-written summary
Prairie and wheat ecosystems may share both pathogens.
- Taxon
- wheat
Triticum aestivume0 - Outcome
- potential to share both pathogense0
- Qualifier
- tallgrass prairiee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tallgrass prairie and commercial wheat ecosystems in the G reat P lains also have the potential to share both pathogens”