Abstract
A collection of 164 Aegilops tauschii accessions, obtained from Gatersleben, Germany, was screened for reaction to leaf rust under controlled greenhouse conditions. We have also evaluated a selection of synthetic hexaploid wheats, produced by hybridizing Ae. tauschii with tetraploid durum wheats, as well as the first and second generation of hybrids between some of these resistant synthetic hexaploid wheats and susceptible Triticum aestivum cultivars. Eighteen (11%) accessions of Ae. tauschii were resistant to leaf rust among which 1 was immune, 13 were highly resistant and 4 were moderately resistant. Six of the synthetic hexaploid wheats expressed a high level of leaf rust resistance while four exhibited either a reduced or complete susceptibility compared to their corresponding diploid parent. This suppression of resistance at the hexaploid level suggests the presence of suppressor genes in the A and/or B genomes of the T. turgidum parent. Inheritance of leaf rust resistance from the intercrosses with susceptible bread wheats revealed that resistance was dominant over susceptibility. Leaf rust resistance from the three synthetics (syn 101, syn 701 and syn 901) was effectively transmitted as a single dominant gene and one synthetic (syn 301) possessed two different dominant genes for resistance.
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Cox, T.S., W.J. Raupp, D.L. Wilson, B.S. Gill, S. Leath, W.W. Bockus & E. Browder, 1992. Resistance to foliar diseases in the collection of Triticum tauschii germ-plasm. Plant Dis. 76: 1061–1064.
Cox, T.S., W.J. Raupp & B.S. Gill, 1994. Leaf rust resistance genes Lr41, Lr42, and Lr43 transferred from Triticum tauschii to common wheat. Crop Sci. 34: 339–343.
Gill, B.S., W.J. Raupp, H.C. Sharma, L.E. Browder, J.H. Hatchett, T.L. Harvey, J.G. Moseman & J.G. Waines, 1986. Resistance in Aegilops squarossa to wheat leaf rust, wheat powdery mildew, green bug and Hessian fly. Plant Dis. 70: 553–556.
Harvey, T.L., T.J. Martin & R.W. Livers, 1980. Resistance to biotype C greenbug in synthetic hexaploid wheats derived from Triticum tauschii. J. Econ. Entomol. 73: 387–389.
Hatchett, J.E., T.J. Martin & R.W. Livers, 1980. Expression and inheritance of resistance to Hessian fly in synthetic hexaploid wheats derived from Triticum tauschii (Coss) Schmal. Crop Sci. 21: 731–734.
Kasha, K.J., 1974. Haploids from somatic cells. In: Haploids in Higher Plants, Advances and Potential, pp. 67-87. University of Guelph.
Kerber, E.R. & P.L. Dyck, 1979. Resistance of stem rust and leaf rust of wheat in Aegilops squarossa and transfer of a gene for stem rust resistance to hexaploid wheat. In: Ramanijam, S. (Ed.), Proc. 5th Intern. Wheat Genet. Symp., pp. 358-364, New Delhi, India.
Kihara, H., K. Yamashita & M. Tanaka, 1965. Morphological, physiological, genetical and cytological studies in Aegilops and Triticum collected in Pakistan, Afghanistan and Iran. Results of the Kyoto University Scientific Expedition to the Korakoram and Hindukush, 1: 1–118.
Ma, H., R.P. Singh & A. Mujeeb-Kazi, 1995. Suppression/expression of resistance to stripe rust in synthetic hexaploid wheat (Triticum turgidum ? Triticum tauschii). Euphytica 80: 87–93.
McIntosh, R.A., B. Friebe, J. Jiang, D. The & B.S. Gill, 1995. Cytogenetical studies in wheat XVI. Chromosome location of a new gene for resistance to leaf rust in a Japanese wheat-rye translocation line. Euphytica 82: 141–147.
Metz, S.G., H.C. Sharma, T.A. Armstrong & P.N. Masica, 1988. Chromosome doubling and aneuploidy in anther-derived plants from two winter wheat lines. Genome 43: 433–442.
Murashige, T. & F. Skoog, 1962. A revised medium for rapid growth and bioassays with tobacco tissue cultures. Physiol. Plant. 15: 473–497.
Roelfs, A.P., R.P. Singh & E.E. Saari, 1992. Rust Diseases of Wheat: Concepts and Methods of Disease Management. CIMMYT, Mexico, D.F.
Stakman, E.C., D.M. Stewart & W.Q. Loegering, 1962. Identification of physiological races of Puccinia graminis var tritici. US. Dept. Agric., ARS E617.
Trottet, J., J. Jahier & A.M. Tanguy, 1982. A study of an amphiploid between Aegilops squarossa Tausch. and Triticum dicoccum Schübl. Cereal Res. Commun. 10: 55–59.
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Assefa, S., Fehrmann, H. Resistance to wheat leaf rust in Aegilops tauschii Coss. and inheritance of resistance in hexaploid wheat. Genetic Resources and Crop Evolution 47, 135–140 (2000). https://doi.org/10.1023/A:1008770226330
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DOI: https://doi.org/10.1023/A:1008770226330