Partial resistance of oats [cultivars] to P. [Puccinia] coronata f sp. avenae [leaf rust].
1992
Brake V.M. | Irwin J.A.G.
Several oat cultivars were inoculated on the 1st, 2nd and 4th leaves with race 264 of P. coronata f. sp. avenae to characterize and determine components of partial resistance (slow rusting). Panfive was the only cultivar to exhibit partial resistance. In the field this cultivar has consistently shown partial resistance. Garry, a cultivar reported to be slow rusting but highly susceptible in the field in Queensland, expressed a significantly lower infection efficiency and uredium density than Algerian and Sual. Results suggested that uredium density gave the best indication of partial resistance across the three leaf ages tested for Panfive. A significant difference was present between uredium densities on upper and lower surfaces of the 4th leaf only for the susceptible and partially resistant cultivars. In general, the resistance of all cultivars tended to increase with an increase in leaf age.
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