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Reaction of triticale wheat and rye to the powdery mildew fungi erysiphe graminis f sp tritici and erysiphe graminis f sp secalis



Reaction of triticale wheat and rye to the powdery mildew fungi erysiphe graminis f sp tritici and erysiphe graminis f sp secalis



Zeitschrift fuer Pflanzenzuechtung 79(2): 110-121



Twenty-one 6x Triticale and 253 8x Triticale lines, a set of wheat-rye chromosome addition lines, and 10 varieties, 236 inbred lines and 8063 plants of rye were tested as seedlings for reaction to 1 or more cultures of E. graminis f. sp. tritici. All the 6x and 90% of the 8x Triticale lines were resistant or moderately resistant; 10% of the 8x Triticale lines were moderately susceptible or susceptible. Race-specific reactions were not found. The frequency of susceptible lines was influenced by the particular combination of rye and wheat parents. The reaction of the addition lines showed that rye resistance was localized to chromosomes III and V with III having the major effect. Rye was generally resistant; 0.04% of the rye seedlings (gametic frequency 2%) were moderately susceptible or susceptible to E. graminis tritici. The same Triticale and addition line materials, 14 varieties and 267 inbred lines of rye, 72 wheat varieties and 858 plants of 'Wheat Composite Cross I' were tested for reaction to E. graminis f. sp. secalis. All the 6x and 97% of the 8x Triticale lines, all addition lines and the wheat material were resistant; 3% of the 8x Triticale lines were moderately resistant. The rye varieties and 97% of the inbred rye lines were moderately susceptible or susceptible; 3% were moderately resistant. No 6x and only 1% of the 8x Triticale lines were powdery mildew susceptible in the field. Adult plant resistance is present in the material. It is unlikely that resistance to E. graminis tritici derived from rye will be permanent when incorporated in Triticale or wheat.

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Reaction of Triticale, wheat and rye to the powdery mildew fungi, Erysiphe graminis f.sp. tritici and E. graminis f.sp. secalis. Zeitschrift fur Pflanzenzuchtung 79(2): ?-121, 1977

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