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GrainGenes Reference Report: AIC-70-41

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Characterization of wheat rusts ( Puccinia spp.) and powdery mildew ( Erysiphe graminis f. sp. tritici ) populations during 1994-2001 at A.R.D.S. Turda, and implications in breeding for resistance
Analele Institutului de Cercetari pentru Cereale si Plante Tehnice, Fundulea
Moldovan M
Moldovan V
Kadar R
Since 1974, the dynamics of virulence in a local population of wheat rusts and powdery mildew has been supervised, at the A.R.D.S. Turda, Romania by the means of special national and international disease nurseries. The resistant genes and the trap cultivars from these nurseries have been monitored in the field, during the adult plant stage under natural or artificial infections with a mixture of local virulences of the studied pathogens. The results obtained during 1994-2001 are presented, with a highlight of the resistance genes and the sources that are still effective. The results should be processed both from the viewpoint of pathogen-population structure and of climatic conditions specific to every year, which could influence differently the manifestation of the attack during the analysed period. The genes that maintained their efficiency for powdery mildew ( Erysiphe graminis f. sp. tritici ) resistance, are Pm2 + Pm6, Pm5 + Pm (MK 983), Pm17 (Amigo), beside a series of adult plant resistance sources (such as cvs. Transilvania, Turda 95, Flamura 85, Fundulea 4, Ardeal). The effective genes for yellow rust ( Puccinia striiformis f. sp. tritici ) are Yr1 (Chinese 166), Yr3, Yr3c, Yr5 ( T. spelta ), Yr11, Yr14, Yr12, 3a, 4a, Yr13, 1, 3a, 4a, Yr17, So, Sd, Sp, Almus, Norda Remus. The genes that are still effective against leaf rust ( Puccinia recondita f.sp. tritici ) are Lr9, Lr19, Lr21 (WGCR 15), Lr22, Lr22a, Lr24, Lr29, Lr32, Lr36, Lr38, Lr39, Lr40, Lr41, Lr42, Lr43, Lr44 I, as well as certain adult plant resistance sources: Turda 195, Transilvania, Turda 81, Ardeal, Flamura 85, Gabriela. The obtained results have greatly contributed to wheat breeding for rusts and powdery mildew resistance. They allowed the identification of new resistance sources, the control of their efficiency over time and their inclusion in the breeding material
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