Diversity for virulence in a sexually reproducing population of Puccinia coronata

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Abstract
Diversity for virulence in a sexually reproducing population of Puccinia coronata Cda. was studied among isolates collected at three distances from a buckthorn hedge [Rhamnus cathartica L.], at six sampling periods during the summer. Among 360 isolates, 155 distinct phenotypes were identified on 28 differential oat cultivars. About 60% of the phenotypes were represented by a single isolate. The number of phenotypes found decreased with time and distance from the hedge. Host responses were classified into low (0 and 0), intermediate (1 and 2), and high (3 and 4) infection type classes. The Shannon-Wiener index of diversity decreased with distance from the buckthorn hedge from 2.58 at the 1-m site to 1.35 at the 10-m site and decreased with time from 3.42 in the second to 2.71 in the sixth sampling period. The mean number of virulence differences among phenotypes in each collection ranged from 4 to 12 with 28 hosts. Both distance and time contributed significantly to the decrease in Shannon-Wiener index and number of phenotypes in multiple regression analyses.

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