Resistance in barley against the powdery mildew fungus (Erysiphe graminis f.sp.hordei) is not associated with enhanced levels of endogenous jasmonates

1995 ◽  
Vol 101 (3) ◽  
pp. 319-332 ◽  
Author(s):  
Karl-Heinz Kogel ◽  
Birgit Ortel ◽  
Birgit Jarosch ◽  
Rainer Atzorn ◽  
Ruth Schiffer ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Erysiphe Graminis ◽  
Powdery Mildew Fungus ◽  
Erysiphe Graminis F.Sp.Hordei

Heat-induced resistance in barley to the powdery mildew fungus Erysiphe graminis f.sp. hordei

1995 ◽  
Vol 47 (1) ◽  
pp. 51-66 ◽  
Author(s):  
Patrick Schweizer ◽  
Laurence Vallélian-Bindschedler ◽  
Egon Mösinger
Keyword(s):  
Powdery Mildew ◽  
Induced Resistance ◽  
Erysiphe Graminis ◽  
Powdery Mildew Fungus

scholarly journals Experiments to examine the significance of ammonia evolution from barley seedlings infected with the powdery mildew fungus, Erysiphe graminis f.sp. hordei

1984 ◽  
Vol 102 (3) ◽  
pp. 679-685 ◽  
Author(s):  
J. F. Jenkyn ◽  
M. E. Finney
Keyword(s):  
Powdery Mildew ◽  
Significant Proportion ◽  
Ammonium Nitrogen ◽  
Erysiphe Graminis ◽  
Powdery Mildew Fungus ◽  
Subsequent Evolution ◽  
Ammonia Gas ◽  
Soil Systems ◽  
Detached Leaves ◽  
Barley Leaves

SummaryExperiments using intact seedlings and detached leaves failed to confirm previous reports that ammonia gas is evolved from barley leaves during the establishment of infection by the powdery mildew fungus Erysiphe graminis f.sp. hordei.In the experiments using intact seedlings infection did, however, lead to greater concentrations of ammonium nitrogen in the senescing leaves and, in one experiment, the subsequent evolution of ammonia gas from these seedlings. Losses of nitrogen as ammonia gas from crops are probably small, but it is possible that under some circumstances they may represent a significant proportion of the otherwise unexplained nitrogen losses and hence be important in experiments which aim to study the nitrogen balance of crop-soil systems.

Genetic analysis of the avirulence of wheatgrass powdery mildew fungus on common wheat

Genome ◽  
1989 ◽  
Vol 32 (5) ◽  
pp. 913-917 ◽  
Author(s):  
Y. Tosa
Keyword(s):  
Triticum Aestivum ◽  
Powdery Mildew ◽  
Genetic Analysis ◽  
Common Wheat ◽  
Erysiphe Graminis ◽  
Wheat Cultivars ◽  
Avirulence Genes ◽  
Powdery Mildew Fungus ◽  
Major Genes ◽  
Formae Speciales

F1 hybrid cultures between Erysiphe graminis f.sp. agropyri (wheatgrass mildew fungus) and E. graminis f.sp. tritici (wheat mildew fungus) were produced by using a common host of the two formae spéciales. When three common wheat cultivars, Triticum aestivum cv. Norin 4, T. aestivum cv. Norin 10, and T. compactum cv. No. 44, were inoculated with a population of F1 cultures, avirulent and virulent cultures segregated in a 3:1 ratio. This indicated that two major genes are involved in the avirulence of E. graminis f.sp. agropyri, Ak-1, on each of the three cultivars. Further analyses revealed that the three pairs of avirulence genes have one gene in common. On T. aestivum cv. Shin-chunaga, T. aestivum cv. Norin 26, and a strain of T. macha, the F1 population segregated in the same pattern as on T. aestivum cv. Norin 4, indicating that the same pair of avirulence genes is operating on these four cultivars. On T. aestivum cv. Red Egyptian the distribution of F1 phenotypes was continuous, suggesting that no major genes are involved in the avirulence of Ak-1 on this cultivar.Key words: powdery mildew, Erysiphe graminis, avirulence, wheat, wheatgrass.

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