Reselection for Improved Resistance of Wheat to Stripe Rust

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Abstract
Ten acceptable commercial cultivars of spring wheat [Triticum aestivum] with resistant, intermediate and susceptible reactions to stripe rust [Puccinia striiformis] were intercrossed. The most resistant seedlings (10-20%) were selected in each of 4 segregating generations, transplanted and grown to maturity. When evaluated as seedlings in controlled environment chambers, 45 spring wheat crosses showed transgressive segregation. Transgressive segregation was demonstrated in later generations in 9 spring wheat crosses that lacked resistant progeny in the F2 and F3. Ten commercial cultivars of winter wheat with acceptable agronomic performance and either intermediate or susceptible reactions to stripe rust also were intercrossed. When evaluated as seedlings in controlled environment chambers, 38 winter wheat crosses showed transgressive segregation. Transgressive segregation also was clearly shown in later generations of 17 winter wheat crosses even though the F2 and F3 of these crosses were totally susceptible. Under field conditions of natural infection, progeny of 27 winter wheat crosses were selected for increased resistance. More resistance was found in the F3 than in the F2 progeny. Many F4 plant progeny were more resistant than the parental cultivars.

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