ARS | Publication request: COMMON CRUPINA FROM THE UNITED STATES IS VARIABLE IN SUSCEPTIBILITY TO PUCCINIA CRUPINAE

Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: March 20, 2006
Publication Date: June 1, 2006
Citation: Bruckart, W.L., Eskandari, F., Berner, D.K., Lesser, K. 2006. Common crupina from the united states is variable in susceptibility to puccinia crupinae. Phytopathology. 96:S17.

Technical Abstract: Common crupina (Crupina vulgaris Cass.) occurs at five distinct locations in the United States (U.S.). Accessions were gathered from four of the locations to test susceptibility of U.S. populations to a Greek isolate of Puccinia crupinae (FDWSRU # 01-056). Common crupina is considered one species in the U.S., but distinct morphological and developmental variation is known between populations. For example, plants from Modoc Co., California (Accession ‘A’), and Lake Chelan, Washington (Accession ‘C’), have a flat rosette habit, and plants from Salmon River, Idaho (Accession ’B’), and Sonoma Co., California (Accession ‘D’), have an upright rosette habit. Similarity of ‘A’ and ‘C’ and of ‘B’ and ‘D’ has been noted for other characteristics, such as chlorophyll content, seed size, and phenological development. Comparisons of susceptibility involved inoculations of the four accessions simultaneously with 104 urediniospores of P. crupinae/ml. Inoculated plants were given dew at 18 – 20 C for 48 hr (dark, except for an 8hr light period) and then placed on a greenhouse bench at 20 C for symptom development. Inoculation of ‘A’ resulted in a few small pustules surrounded by necrotic rings. Inoculation of ‘B’ resulted in a limited number of small pustules, and infected leaves became necrotic and died. Inoculation of ‘C’ resulted in many large pustules and heavy sporulation; infected leaves senesced prematurely. Results of inoculation of ‘D’ were similar to those of ‘B’. The conclusion was that there were two basic reaction types, although ‘A’ developed much less disease than ‘C’. Reaction types coincided with other characteristics distinguishing these accessions.