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Physiological effects in case of interactions between powdery mildew erysiphe graminis f sp hordei and leaf brown rust puccinia hordei on barley



Physiological effects in case of interactions between powdery mildew erysiphe graminis f sp hordei and leaf brown rust puccinia hordei on barley



Zeitschrift fuer Pflanzenkrankheiten und Pflanzenschutz 92(4): 407-416



To elucidate effects of interactions between powdery mildew and leaf brown rust, the germination behavior of uredospores during development of powdery mildew was investigated. With rust inoculation following 4-6 days after mildew infection, the germination rate in the immediate neighborhood of mildew hyphae was reduced, only a small portion of the germination tubes reached stomatal cells; uredospores within the net of mildew hyphae formed atypical germination tubes. However, this can not explain the effects of interaction. Mutual effects of both parasites on number of uredia, size of pustules of powdery mildew, onset of fructification, sporulation time and production of spores could also be observed after inoculation on opposite leaf side. The influence of mildew infection on the development of brown rust can be largely neutralized by a mildew fungicide (tridemorph). Concentrations of soluble carbohydrates and sucrose in infected leaf parts are increased by powdery mildew up to 8 resp. 4 days after inoculation, by brown rust they are reduced 8-12 resp. 6-12 days after inoculation; contents of glucose and fructose rise. Simultaneous inoculation with both pathogens diminish reactions. An inoculation with brown rust following 4 days after mildew infection cannot change the physiological situation, for the benefit of the rust. The effects of interaction are attributed to a strong competition for assimilates among the parasites.

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