Puccinia coronata

Puccinia coronata

''Puccinia coronata'' is a plant pathogen and causal agent of oat and barley crown rust. The pathogen occurs worldwide, infecting both wild and cultivated oats. Crown rust poses a threat to barley production, because the first infections in barley occur early in the season from local inoculum. Crown rusts have evolved many different physiological races within different species in response to host resistance. Each pathogenic race can attack a specific line of plants within the species typical host. For example, there are over 290 races of ''P. coronata''. Crops with resistant phenotypes are often released, but within a few years virulent races have arisen and ''P. coronata'' can infect them.
Rust Fungus - Puccinia coronata Host plant: Frangula sp. Frangula,Geotagged,Puccinia,Puccinia coronata,Spring,United States,rust fungus

Evolution

Research into ''P. coronata'' on ''A. sativa''/oat crown rust has been foundational to the understanding and definition of "tolerance" in phytopathology. In 1958 Caldwell et al. defined tolerance as that which "enables a susceptible plant to endure severe attack by a rust fungus without sustaining severe losses in yield or quality." Although they noted that most interest was in breeding for hypersensitive responses, they located, differentiated, quantified, and defined "tolerance" for the first time in cultivars prevalent in the United States.

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Taxonomy
KingdomFungi
DivisionBasidiomycota
ClassPucciniomycetes
OrderPucciniales
FamilyPucciniaceae
GenusPuccinia
SpeciesP. coronata
Photographed in
United States of America