宮城県で採集したオニウシノケグサのいもち病菌の特徴

抄録

The pathogenicity and mycological aspects of blast fungi isolated from Festuca arundinacea in Miyagi Prefecture, northern Japan, were studied. They typically formed elliptical lesions with pointed ends, a whitish-grey center and reddish-brown margin on their host and on Italian ryegrass, but they did not form lesions on rice or crabgrass. They produced the dihydropyriculol, but not the pyrichalasin H which is characteristic toxin of crabgrass blast fungi. The RFLP band patterns of the β-tubulin gene from the isolates corresponded to those of Pyricularia oryzae; no products were amplified by Digitaria-specific primers. Thus, isolates from F. arundinacea were assessed to be P. oryzae.