Physiologic specialisation in Puccinia coronata avenae

Murphy, H.C.

Phytopathology 20(1): 143-144


ISSN/ISBN: 0031-949X
Accession: 013462444

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Single-uredospore isolations were made from 45 collections of crown rust of oats (Puccinia coronata avenue) , 32 of which were found on Avena and 13 on Rhamnus. Each of these cultures was grown on pure-line selections of 33 varieties and species of oats, eight of which acted as differential hosts. These showed that nine physiological forms were represented, which are termed forms I to IX . Their action on the differential hosts is shown in a table. The aecidial collections on five different species of Rhamnus represented the following physiologic forms: all four collections from R, cathartica gave form III; all six from R. lanceolata gave form V; one each from JR. tinctoria, R.montana, and R.infectoria gave forms VII, VIII, and IX, respectively. Forms III and V were of most frequent occurrence on Rhamnus and I, III, and V on Avena. Form V was the most widespread and virulent, sparing none of the varieties, pure-line selections, or species of oats tested. Form I predominated in the south-western States.