Relations between stress-induced modifications of the pathogenesis of Erysiphe graminis hordei and the membrane components of barley
1992
Oerke, E.-C. (Hannover Univ. (Germany). Inst. fuer Pflanzenkrankheiten und Pflanzenschutz) | Krone, C. | Jacobi, I. | Schoenbeck, F.
Experiments with barley (cv. 'Mammut') investigated the effect of abiotic stress (48 h chilling at 4 degrees C, 60 h water deficiency) on the pathogenesis of Erysiphe graminis f. sp. hordei and the composition of membrane bound proteins. Exposing the plants to chilling stress and water stress resulted in increased susceptibility of barley to E. graminis by 90 % and by 60 %, respectively. The early development of the pathogen on the leaf (germination, formation of appressoria) was not affected by different treatments of the plants before inoculation. There was a stimulation of E. graminis with the beginning of the biotrophic phase, which was reflected by an earlier and increased formation of primary haustoria, higher specific sporulation rate and larger colony areas. Apart from the modified predisposition, the composition of the plasma membrane proteins and lipids was altered. Chilling increased the content of polar lipids whereas water deficiency raised the level of neutral lipids. Both stress factors resulted in quantitative modifications of the protein patterns of isolated plasma membranes. When plants were allowed to recover under optimal environmental conditions, the stress induced modification of the plasma membranes and the predisposition returned to normal. The promotion of the biotrophic parasite is discussed in relation to the composition and the properties of the plasma membrane
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