Effects of defense reactions on plant growth and yield in incompatible host-parasite-systems
1987
Schoenbeck, F. (Technische Univ. Hannover (Germany, F.R.). Inst. fuer Pflanzenkrankheiten und Pflanzenschutz) | Grunewaldt-Stoecker, G. | Wilde, T.
allemand. Investigations in incompatible host-parasite-systems (barley - Erysiphe graminis and lettuce - Bremia lactucae) were carried out to prove, whether the induction of defense reactions leads to measurable effects on the yield performance of plants. Permanent or frequent inoculations with avirulent races decreased yield of barley and lettuce remarkably, expressed in reduced fresh weight and dry matter. Less grains were produced and their contents of carbohydrates and amino acids were diminished significantly. In young plants a reduction in sugar content was evident already after a single inoculation. In barley as in lettuce was shown not only for inoculated, but also for plant parts not present at the time of inoculation. There, in addition especially aromatic amino acids maintenance of postinfectional resistance mechanisms either of a hypersensitive or non-hypersensitive reaction type for growth and yield performance are discussed with regard to an increased consumption of energy and carbohydrates
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