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Adult plant resistance of wheat triticum sp cultivar thatcher to stem rust puccinia graminis f sp tritici



Adult plant resistance of wheat triticum sp cultivar thatcher to stem rust puccinia graminis f sp tritici



Phytopathology 71(2): 181-185



No relationship was found between the independent Sr genes for seedling resistance and the adult plant resistance of 'Thatcher' wheat, as measured by rust severity. Pyramids of seedling resistance genes Sr5, Sr12, Sr16 and SrTc did not improve resistance to stem rust. The performance of some progeny lines with both Sr12 and SrTc was similar to 'Thatcher's', and this suggests that the factor(s) involved in the adult plant resistance of 'Thatcher' might be related to this Sr gene combination. The adult plant resistance of 'Thatcher' was sensitive to inoculum density. Although this character was selected successfully under heavy inoculum density at the end of the season, the resistance was most apparent at stage 24 (early milk). Under light inoculum density, however, the greatest difference existed in the terminal disease severities.

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Accession: 004682618

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