Genetic analysis of powdery mildew resistance in wheat triticum aestivum cultivar diplomat

Chae Y A.; Fischbeck, G.W.

Zeitschrift fuer Pflanzenzuechtung 83(3): 272-280


Accession: 005511300

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Two monosomic sets from 'Chinese Spring' and 'Caribo' were used to study the genetic system controlling powdery mildew (Erysiphe graminis) resistance in the cultivar Diplomat. Fourteen chromosomes were involved in the expression of resistance to mildew attack on the upper leaves from heading to milky ripe stages. These chromosomes were divided into 3 groups. Group 1 included homoeologous group 5 which were of major importance due to their constant resistant effect (except the translocated 5B/7B), regardless of the counterpart genotypes or time span, and chromosomes 7A and 4D which increased resistance in both backgrounds, but were less effective than the group 5 chromosomes. Group 2 included chromosomes 1A, 2A, 3B, 4B and 3D which interacted positively (increased resistance) only in crosses with the more susceptible parent ('Caribo'). Chromosomes 6B and 7D increased resistance in one genotype, but increased susceptibility in the other. Group 3 of chromosomes 2D and 6D introduced significantly more intensive mildew attack in both background genotypes. Many of the group 2 or 3 chromosomes were less effective in increasing resistance, or more effective in increasing susceptibility at later growing stages.