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Genetics of Adult-Plant Leaf Rust Resistance in ‘Chinese Spring’ and ‘Sturdy’ Wheats

Res. Stn., Res. Branch, Agric. Canada, 195 Dafoe Road, Winnipeg, MB R3T 2M9

^* Corresponding author.

The common wheat (Triticum aestivum L.) cultivars Chinese Spring and Sturdy have adult-plant resistance to leaf rust caused by Puccinia recondita Rob. ex Desm. To study the genetics of this resistance both cultivars were crossed and backcrossed to ‘Thatcher’, a leaf rust susceptible cultivar. The two cultivars or resistant selections from the above crosses were also crossed with backcross lines having Lrl2, Lr13, and Lr34 genes for adult-plant leaf rust resistance. The backcross F₂ families and F₂ populations were grown in a field rust nursery artificially inoculated with a mixture of P. recondita isolates. The segregation for rust reaction of adult plants indicated that both cultivars have a combination of genes Lrl2 and Lr34. To assist in the identification of Lr34 in these cultivars, adult-plant leaf rust resistance from each cultivar was transferred into Thatcher.

Received for publication May 10, 1990.

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