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Specific resistance factors to yellow rust in seedlings of some french wheat varieties and races of puccinia striiformis westend in france



Specific resistance factors to yellow rust in seedlings of some french wheat varieties and races of puccinia striiformis westend in france



Agronomie (Paris) 10(2): 103-114



Infection types in Triticum aestivum L seedlings induced by 9 French races of Puccinia striiformis Westend were used to assess the hypothetical content of specific genes for resistance to yellow rust in 21 wheat varieties widely grown in France. Resistance to the race 0E0 showed that none of the varieties lacked resistance factors. Most of the varieties possessed by only 1 to 3 known Yr genes. The postulated genes were Yr1, Yr2, (Yr3a + Yr4a), Yr6 and Yr7. The varieties Festival, Fidel, Beauchamp, Gala, Castan, Scipion, Caton, Darius, Top, Soissons, and Thesee may carry one or more resistance factors belonging to the set of SD (Strubes Didkkopf), Yr2, and (Yr3a + Yr4a). Further hypotheses were developed with the use of British races. Top was postulated to possess (Yr3a + Yr4a) and Darius to have Yr2. Yr7 was postulated in Prinqual, Talent, and Tango. Corin probably possesses Yr1 and might also carry Yr2 and/or (Yr3a + Yr4a). Garant and Hardi may possess Yr7 and Yr2 or (Yr3a + Yr4a). Recital and Austerlitz and reactions consistent with the presence of Yr6, and the latter may have an extra gene. Camp Remy and Arminda were resistant to all races tested. Surveys of P. strilformis showed the importance of races whose virulence spectra were able to match most of these resistance genes. Two races (45E140 and 45E172) were mostly responsible for the 1987 and 1988 epidemics; 3 others (41E136, 109E141, and 109E173) were also important.

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