Abstract
Nine Mexican spring bread wheat (Triticum aestivum L.) cultivars derived from CIMMYT germplasm and the U.S. spring wheat cultivar Wheaton were susceptible to the Mexican Puccinia striiformis pathotype 14E14 in seedling growth stage, but displayed different levels of adult plant resistances to the same pathotype when tested in the field. One hundred and eighteen random F2 plant derived F3 and F5 lines from the crosses of these ten adult plant resistant wheats and susceptible cultivar Jupateco 73S were evaluated in the field. The moderate adult plant resistance of Penjamo 62, Lerma Rojo 64, Nacozari 76, Tesia 79, and Wheaton was under monogenic genetic control and was attributed to the adult plant stripe rust resistance gene Yr18. The moderate resistances of Cleopatra 74, Zaragoza 75, and Apache 81 were also monogenic, but gene Yr18 was absent. Pavon 76 carried two partially effective additive genes; and the adult plant resistance of Tonichi 81 was based on additive interaction involving Yr18 and two additional partially effective genes. Tonichi 81 does not carry any seedling resistance gene, however, the adult plant resistance is highly effective worldwide. This resistance, designated as the Yr18 complex, is of a durable nature. The partial adult plant resistance of Pavon 76 has also remained durable in Mexico and other countries where it is grown.
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Singh, R.P., Rajaram, S. Genetics of adult plant resistance to stripe rust in ten spring bread wheats. Euphytica 72, 1–7 (1993). https://doi.org/10.1007/BF00023766
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DOI: https://doi.org/10.1007/BF00023766