ARS | Publication request: Resistance Reactions of Daylily Cultivars to Puccinia Hemerocallidis

Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: April 1, 2005
Publication Date: June 1, 2005
Citation: Li, Y.H., Windham, M.T., Trigiano, R.N., Fare, D.C., Spiers, J.M., Copes, W.E. 2005. Resistance Reactions of Daylily Cultivars to Puccinia hemerocallidis. Phytopathology. 95:S61.

Technical Abstract: Resistance reactions of eight daylily cultivars to Puccinia hemerocallidis were investigated ten days after inoculating detached leaf segments. Leaves of highly resistant cultivars, ‘Prairie Blue Eyes’ and ‘Bertie Ferris’, were characterized as having tiny yellow spots or no symptoms at the point of penetration by the fungus. Leaves of resistant cultivars, ‘Buttered Popcorn’, ‘Chicago Apache’ and ‘Stella De Oro’, showed a hypersensitive reaction and uredia were not formed. Leaves of moderately susceptible cultivars, ‘Mary Todd’ and ‘Chorus Line’, exhibited a hypersensitive reaction, but uredia and urediniospores formed. Leaves of susceptible cultivars, ‘Pardon Me’, supported abundant spore production without a hypersensitive reaction. Rust development on abaxial and adaxial leaf surfaces of ‘Pardon Me’ were compared in combinations of the side of the leaf inoculated and the orientation of the leaf during incubation. Infection efficiency was significantly lower and latent period delayed on adaxial leaf surfaces compared to abaxial surfaces regardless incubation sides.