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Afternoon Ascospore Release in Claviceps purpurea Optimizes Perennial Ryegrass Infection Public Deposited

https://ir.library.oregonstate.edu/concern/articles/5712m8276

This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 2015. The published article can be found at:  http://apsjournals.apsnet.org/loi/pdis

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  • In Kentucky bluegrass (Poa pratensis), Claviceps purpurea, the causal agent of ergot, typically releases ascospores during the early-morning hours, between about midnight and 10:00 A.M., corresponding to time of flowering, when the unfertilized ovaries are most susceptible to infection. During aeromycology studies of C. purpurea in perennial ryegrass (Lolium perenne) in northeastern Oregon during 2008 to 2010 and 2013, a strain of C. purpurea was found that released ascospores in the afternoon, coinciding with flowering in perernrial ryegrass. Under controlled environmental conditions, sclerotia from perennial ryegrass and Kentucky bluegrass released spores in the afternoon and morning, respectively, consistent with tirning of spore release under field conditions. Internal transcribed spacer (ITS) sequences of single sclerotial isolates from Kentucky bluegrass and perennial ryegrass were consistent with C. putpurea, although minor variations in ITS sequences among isolates were noted. Differences between Kentucky bluegrass and perennial ryegrass isolates were observed in random amplified polymorphic DNA. Evidence is provided for adaptation of C. purpurea to perennial ryegrass by means of delayed spore release that coincides with afternoon flowering in perennial ryegrass.
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  • Alderman, S., Walenta, D. L., Hamm, P. B., Martin, R. C., Dung, J. K., & Kosman, E. G. (2015). Afternoon ascospore release in Claviceps purpurea optimizes perennial ryegrass infection. Plant Disease, 99(10), 1410-1415. doi:10.1094/PDIS-09-14-0978-RE
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