Author:
Adhikari K. N.,McIntosh R. A.,Oates J. D.
Abstract
Seedlings of 40 Australian oat cultivars and 154 elite oat lines were tested
with various pathotypes of P. graminis avenae. Fourteen
cultivars carried Pg-2 and/or
Pg-4. One cultivar carried Pg-13
and 4 carried Pg-a. Several cultivars possessed
different combinations of Pg-1,
Pg-2, Pg-3, and/or
Pg-4, but none possessed Pg-8 or
Pg-9. Since most elite lines were resistant to all
cultures collected from the pathogenicity survey in 1993 and gave similar low
infection types, it was postulated that they all carried a common gene,
Pg-a. All isolates from the 1993 survey, except one from
northern New South Wales, were avirulent for Pg-a.
Studies of the effect of temperature on reaction to stem rust showed that
resistances in lines possessing Pg-8 and
Pg-16 became ineffective at 21.5°C, but were
effective at 17°C. Similarly, resistances in lines possessing
Pg-4, Pg-12, and
Pg-a were effective at 21.5°C, but became
ineffective at or above 26°C. Resistances conferred by
Pg-1, Pg-2,
Pg-13, and Pg-Sa were not affected
by temperature. Although resistance conferred by Pg-a
was temperature-sensitive, the retardation of fungal growth with decrease in
temperature suggested that increasing day temperatures would not cause the
breakdown of this resistance provided night temperatures remain cool.
Subject
General Agricultural and Biological Sciences
Cited by
12 articles.
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