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Gene action for inheritance of durable high temperature adult plant resistance to stripe rust in wheat triticum aestivum



Gene action for inheritance of durable high temperature adult plant resistance to stripe rust in wheat triticum aestivum



Phytopathology 76(4): 435-441



Gaines, Nugaines, and Luke winter wheat cultivars have durable, high-temperature, adult-plant resistance to Puccinia striiformis Parental, F1, F2, and backcross populations from reciprocal crosses between individual plants of resistant cultivars and with individual plants of a susceptible line were evaluated in the field. Rust intensity on each of approximately 8,000 plants was recorded three times during the season, and areas under disease progress curves were calculated from the intensity data. Resistance in the three cultivars was partially recessive (susceptibiity was partially dominant) with no maternal inheritance. Epistatic gene action for resistance was significant in Nugaines, but most gene action among loci was additive. Epistatic gene action for susceptibility was detected in Luke, but its probability was lower than the probability for epistatic gene action in Nugaines. The proportion of susceptible progeny was higher than expected in the Gaines .times. susceptible cross, and gene action among loci in Gaines was not clear. The differences between Gaines and Nugaines were not due to epistatic gene action. Resistance genes in Luke were different from resistance genes in either Gaines or Nugaines.

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