Disease response pattern of 127 T1B1RS translocation and substitution wheat cultivars, possessing powdery mildew resistance gene Pm8 and leaf rust resistance gene Lr26 located on rye chromosome arm iRS, revealed that sixteen of these cultivars express Lr26, but not concomitant Pm8 resistance. The mode of inheritance studied in the F1, F2 and F3 generations, and involving hybrids of cultivars Agra, Florida, Olymp, Sabina and Tjelvar not expressing Pm8 resistance indicated inhibition of resistance gene Pm8 by a dominant suppressor.
In former Czechoslovakia virulence of rusts attacking wheat was studied since the sixties. Since the same time genes for resistance in the registered cultivars were identified. The role of Berberis and Thalictrum as alternate hosts for stem rust and leaf rust, respectively, was investigated as well. Determined changes of virulence in rust populations could only partially be ascribed to changes of resistance genes in the grown cultivars. Unnecessary genes for virulence had no negative effect on the fitness of the pathogen. All tested samples of aeciospores from barberries attacked rye, not wheat. None of Thalictrum species occurring in the Czech and Slovak Republics was found to host wheat leaf rust. However, the sexual stage of wheat stem rust and wheat leaf rust could be induced on Berberis vulgaris and Thaiicmtm speciosissimum, respectively. General epidemiological conclusions are drawn from the results and experience of the-last 35 years.
An Aegilops L. collection with 857 accessions represents a large part of the collection of wild Triticeae species in the Gene Bank Praha‐Ruzyne. A considerable part (672) was received from the Gene Bank, IGK, Gatersleben, and 123 accessions were collected during expeditions to the USSR, Bulgaria, Yugoslavia, and Czechoslovakia. All accessions are being evaluated for resistance to a mixture of the most common races of stem, leaf and stripe rusts and powdery mildew. Considerable variablility was found among and within species in response to rusts, and a high resistance to powdery mildew. Investigation of quality features in 26 accessions showed a very high protein eontent (19 to 34%). Microsedimentation SDS test of grouts showed a considerable variation. All passport and evaluation data have been included in the genetic resources information system
An Aegilops L. collection with 857 accessions represents a large part of the collection of wild Triticeae species in the Gene Bank Prdha-Ruzynt. A considerable part (672) was received from the Gene Bank, IGK, Gatersleben, and 123 accessions were collected during expeditions to the USSR, Bulgaria, Yugoslavia, and Czechoslovakia. All accessions are being evaluated for resistance to a mixture of the most common races of stem, leaf and stripe rusts and powdery mildew. Considerable variablility was found among and within species in response to rusts, and a high resistance to powdery mildew. Investigation of quality features in 26 accessions showed a very high protein eontent (19 to 34 %). Microsedimentation SDS test of grouts showed a considerable variation. All passport and evaluation data have been included in the genetic resources information system
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