Evaluation of seedling and adult plant resistance in European wheat cultivars to Australian isolates of <Emphasis Type="Italic">Puccinia striiformis</Emphasis> f. sp. <Emphasis Type="Italic">tritici</Emphasis> |
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Authors: | Amin K Pathan Colin R Wellings Harbans S Bariana Robert F Park |
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Institution: | (1) The University of Sydney, Plant Breeding Institute, PMB 11, Camden, NSW, 2570, Australia;(2) Present address: Plant Protection Chemistry New Zealand, Private Bag 6282, Rotorua, New Zealand |
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Abstract: | A set of 105 European wheat cultivars was assessed for seedling resistance and adult plant resistance (APR) to stripe (yellow)
rust in greenhouse and field tests with selected Australian isolates of Puccinia striiformis f. sp. tritici (Pst). Twelve cultivars were susceptible to all pathotypes, and among the remainder, 11 designated seedling genes (Yr1, Yr3, Yr4, Yr6, Yr7, Yr9, Yr17, Yr27, Yr32, YrHVII and YrSP) and a range of unidentified seedling resistances were detected either singly or in combination. The identity of seedling
resistance in 43 cultivars could not be determined with the available Pst pathotypes, and it is considered possible that at least some of these may carry uncharacterised seedling resistance genes.
The gene Yr9 occurred with the highest frequency, present in 19 cultivars (18%), followed by Yr17, present in 10 cultivars (10%). Twenty four cultivars lacked seedling resistance that was effective against the pathotype
used in field nurseries, and all but two of these displayed very high levels of APR. While the genetic identity of this APR
is currently unknown, it is potentially a very useful source of resistance to Pst. Genetic studies are now needed to characterise this resistance to expedite its use in efforts to breed for resistance to
stripe rust.
Colin R. Wellings seconded from NSW Department of Primary Industries. |
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Keywords: | Gene postulation Puccinia striiformis Triticum aestivum Phenotype Stripe rust Yellow rust |
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