Summary
Resistance to several Australian strains of Puccinia graminis f. sp. tritici in four entries of the 1963 International Spring Wheat Rust Nursery, viz 25 (W3300), 318 (W3301), 386 (W3302) and 409 (W3303), was shown to have in each case a complex basis. In W3300 seedling resistance was controlled by Sr5, Sr9b, and a third, dominant gene, designated SrN, which conditioned resistance to all Australian strains. W3301 possessed the recessive gene sr17, and a new gene, srK1, which was effective against 16 of the 18 strains used. A third gene, SrK2, operated in adult plants only.
W3302 was shown to carry Sr11, and two genes, SrM1 and srM2, both apparently derived from Marquillo. Five already known genes, viz Sr5, Sr6 Sr8, Sr9b and sr17, and an undescribed dominant gene SrR were isolated from W3303. SrR appeared to be allelic with SrN.
The present studies suggest that worldwide resistance shown by the four entries was due in each instance to a combined effect of genes already catalogued by Sr numbers and new genes. In each entry the new genes, either singly or in combination, provided resistance to Australian strains which have genes for virulence on the designated genes.
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References
Athwal, D. S. & Watson, I. A., 1955. Inheritance of reaction to wheat stem rust in crosses involving Marquillo, Thatcher and Hochzucht. Proc. Linn. Soc. N.S.W. 80: 113–129.
Hayes, H. K., Ausemus, E. R., Stakman, E. C., Bailey, C. H., Wilson, H. K., Bamberg, R. H., Markely, M. C., Crim, R. F. & Levine, M. N., 1936. Thatcher wheat. Univ. Minn. Bull. 325.
Knott, D. R., 1957. The inheritance of rust resistance. III. The inheritance of stem rust resistance in nine Kenya varieties of common wheat. Can. J. Pl. Sci. 37: 366–384.
Knott, D. R. & Anderson, R. G., 1956. The inheritance of rust resistance. I. The inheritance of stem rust resistance in ten varieties of common wheat. Can. J. agric. Sci. 36: 174–195.
Knott, D. R. & Shen, I-Sun, 1961. The inheritance of rust resistance. VII. The inheritance of resistance to races 15B and 56 of stem rust in eleven common wheat varieties of diverse origin. Can. J. Pl. Sci. 41: 587–601.
Koo, K. S. & Ausemus, E. R., 1951. The inheritance of reaction to stem rust in crosses of Timstein with Thatcher, Newthatch and Mida. Agron. J. 43: 194–201.
Luig, N. H., 1967. A high reversion rate for yellow urediospore colour in Puccinia graminis f. sp. tritici. Phytopathology 57: 1091–1093.
Luig, N. H. & Watson, I. A., 1965. Studies on the genetic nature of resistance to Puccinia graminis var. tritici in six varieties of common wheat. Proc. Linn. Soc. N.S.W. 90: 299–327.
McIntosh, R. A., Luig, N. H. & Baker, E. P. 1967. Genetic and cytogenetic studies of stem rust, leaf rust and powdery mildew resistances in Hope and related wheat cultivars. Aust. J. biol. Sci. 20: 1181–1192.
Rajaram, S., 1971. Genetics of rust reaction in Triticum aestivum ssp. vulgare ‘W3299’. Ind. J. Genet. Pl. Breed. (in press).
Rajaram, S., Luig, N. H. & Watson, I. A., 1971a. The inheritance of leaf rust resistance in four varieties of common wheat. Euphytica 20: 574–585.
Rajaram, S., Luig, N. H. & Watson, I. A., 1971b. Genetic analysis of stem rust resistance in three cultivars of wheat. Euphytica 20: 441–452.
Sheen, S. J. & Snyder, L. A., 1964. Studies on the inheritance of resistance to six stem rust cultures using chromosome substitution lines of a Marquis wheat selection. Can. J. Genet. Cytol. 6: 74–82.
Villanueva Novoa, R., 1955. Herencia de la reación a ‘Oidium’, roya de la hoja, roya del tallo y de otros caracteres, en el cruce de los trigos ‘Maria Escobar’ e ‘Industrial Argentino’. (Inheritance of reaction to mildew, leaf rust, stem rust and other characters in the cross of the wheats Maria Escobar and Industrial Argentino). Bol. Estac. exp. agric. La Molina 59, pp. 30 (mimeo). Cited P.B.A. 26, No 1185.
Watson, I. A. & Luig, N. H., 1963. The classification of Puccinia graminis var. tritici in relation to breeding resistant wheats. Proc. Linn. Soc. N.S.W. 88: 235–258.
Watson, I. A. & Luig, N. H., 1966. Sr 15-a new gene for use in the classification of Puccinia graminis var. tritici. Euphytica 15: 239–250.
Watson, I. A. & Luig, N. H., 1968. Progressive increase in virulence in Puccinia graminis f. sp. tritici, Phytopathology 58: 70–73.
Watson, I. A. & Stewart, D. M., 1956. A comparison of the rust reaction of wheat varieties Gabo, Timstein, and Lee. Agron. J. 48: 514–516.
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Rajaram, S., Luig, N.H. The genetic basis for low coefficient of infection to stem rust in common wheat. Euphytica 21, 363–376 (1972). https://doi.org/10.1007/BF00036777
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DOI: https://doi.org/10.1007/BF00036777