Abstract
The activity of elicitors found in intercellular washing fluids (IWF) from infected wheat leaves and in extracts from germinating spores of both leaf rust ( Puccinia recondita f.sp. tritici) and stem rust ( Puccinia graminis f.sp. tritici) fungi was examined in a range of wheat cultivars drawn from Australian and German seed collections. Not all cultivars responded to these preparations. A comparison of the activity of each of the elicitor fractions from both rusts revealed that, regardless of source, the elicitors were active in the same group of cultivars. The ability of germ tube extracts to elicit both visible leaf responses and the induction of the enzyme phenylalanine ammonia-lyase was tested in two chromosome substitution lines. These experiments suggested that responsiveness to the elicitors in each case was controlled by a gene(s) in chromosome 5A of the host.
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