ARS | Publication request: Microscopic and Macroscopic Studies on the Development of Puccinia hemerocallidis in Resistance and Susceptible Daylily Cultivars

Submitted to: American Society of Horticulture Science Meeting
Publication Type: Abstract Only
Publication Acceptance Date: April 1, 2006
Publication Date: June 1, 2006
Citation: Li, Y.H., Windham, M.T., Trigiano, R.N., Fare, D.C., Spiers, J.M., Copes, W.E. 2006. Microscopic and Macroscopic Studies on the Development of Puccinia hemerocallidis in Resistance and Susceptible Daylily Cultivars. American Society of Horticulture Science Meeting. 95:S60.

Technical Abstract: Infection process of Puccinia hemerocallidis, the causal agent of daylily rust, and resistance responses in eight daylily cultivars were studied macroscopically and microscopically. After germination of urediniospores, appressoria formed at the tip of germ tubes and penetrated through stomatal openings. Intercellular hyphae aggregated and formed uredia under the infection sites, and released urediniospores after rupturing the epidermis. In highly resistant cultivars ‘Prairie Blue Eyes’ and ‘Bertie Ferris’, intercellular hyphal growth was restricted and uredia were not formed. No macroscopic symptoms of the disease were present on the leaf surface although a few collapsed cells were observed microscopically. Both resistant and moderately resistant reactions were characterized by necrotic lesions with many collapsed cells under infection sites. The difference between these two reactions was that uredia and urediniospores were observed on the moderately resistant cultivar ‘Chicago Apache’, but not on resistant cultivars, ‘Buttered Popcorn’ and ‘Stella De Oro’. Sporulation was observed on both moderately susceptible and susceptible cultivars, but latent periods were delayed and the amount of urediniospore production was reduced on moderately susceptible cultivars, ‘Mary Todd’ and ‘Chorus Line’, compared to susceptible cultivar ‘Pardon Me’. The results indicate that the hypersensitive cell death is one of the resistance responses to daylily rust, but necrotic lesions on leaf surfaces are associated with the amount of collapsed host cells. Delayed latent periods and reduced sporulation that resulted from restricted intercellular hyphal growth could represent another resistance mechanism in the daylily rust pathosystem.