Summary
The genetics of resistance to stem rust in 3 cultivars of common wheat, namely Gamut, Timgalen and W 3198 was studied. The variety Gamut was found to possess the genes Sr6, Sr9b, Sr 11 and one previously undescribed gene designated Sr Gt. The latter gene conditions a ‘2=2−’ infection type to all Australian strains including those designated ‘1, 2, 3’.
Timgalen was found to carry 5 genes, namely Sr5, Sr6, Sr8, SrTt and srT. The presence of the gene SrTt (identical to the resistance of C.I. 12632, a derivative of Triticum timopheevi) in Timgalen is puzzling as no variety with this gene figured significantly in its pedigree. W3198 carried the genes Sr11, Sr13, and sr17 derived from Gabo, Khapstein and Hofed 1200 respectively. The study suggested that as a general principle, plant breeders should aim at a broad genetic base in resistant cultivars.
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Rajaram, S., Luig, N.H. & Watson, I.A. Genetic analysis of stem rust resistance in three cultivars of wheat. Euphytica 20, 441–452 (1971). https://doi.org/10.1007/BF00035672
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DOI: https://doi.org/10.1007/BF00035672