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Studies of tolerance induction in wheat infested with powdery mildew or aphids


Zeitschrift fuer Pflanzenkrankheiten und Pflanzenschutz 103(3): 300-309
Studies of tolerance induction in wheat infested with powdery mildew or aphids
The aim of this study was to investigate and to compare the possibilities and modes of action of tolerance induction with one single inducer towards different parasites. With an inducer produced by a Bacillus subtilis strain (B 50), tolerance could be induced in wheat infested by Erysiphe graminis as well as by Rhopalosiphum padi. By similar infestation density on treated and untreated plants, tolerance was shown through increased yield. Tolerance induction was connected with changes in the sinksource-relations of infested plants: the attractive activity of the 'pathological' sink was weakened in favour of the natural sink, resulting in a higher biomass production. Hence the relation between infestation severity and detrimental effect was uncoupled. These effects applied for both the fungus as well as for the aphid. With regard to the tolerance induction with our inducer, no taxonomically defined parasite-related specificity exists. Partial causes of those effects may be considerable changes in the plant's hormone balance. Especially the positive influence on endosperm cells after aphid infestation can be related to an increased auxin content.


Accession: 003283119



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