Abstract
Many micro-organisms including pathogenic and saprophytic bacteria react with plant cells in the intercellular spaces inducing different defence responses. The local Early Induced Resistance (EIR) is a first line defence mechanism against bacteria. Here an overview will be given of this local, nonspecific, symptomless defence mechanism as a separate entity from the incompatible-specific Hypersensitive Response (HR). The EIR operates 1–6 h after inoculation (hpi) for about one day depending on temperature and leaf age. The EIR can be inhibited by a short heat shock (50°C for 15 sec) of leaves or by a plant protein synthesis inhibitor, cycloheximide (5 µg m1−1). In a compatible host-pathogen relationship (Pseudomonas syringae pv. tabaci/tobacco) the effect of EIR does not eventuate. However, the EIR develops simultaneously with the HR and sometimes is able to prevent it when the induction time of HR is longer than the time required for the development of the EIR (e.g. P. s. pv. phaseolicola does not induce HR in tobacco above 28°C). It seems that the EIR inhibits the metabolism of bacteria and the activity of hrp genes. Moreover, EIR activates the accumulation of H2O2 at the bacterial attachment site expressing new peroxidase isoenzymes in the initiated plant tissue. Further investigations, hopefully, will clarify the relationship of other complementary defence mechanisms like local late induced resistance (LIR) examined by Sequeira (1983) and Mazzucchi and co-workers (1979), Minardi (1995), Newman et al., (2001).
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Klement, Z., Bozsó, Z., Besenyei, E., Czelleng, A., Kecskés, M.L., Ott, P.G. (2003). Early Induced Resistance, a General, Symptomless Plant Response to Bacteria. In: Iacobellis, N.S., et al. Pseudomonas syringae and related pathogens. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0133-4_32
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DOI: https://doi.org/10.1007/978-94-017-0133-4_32
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