Abstract
SummaryUpon infection of a plant by a pathogen, a series of drastic metabolic changes occur within the plant. One characteristic feature of this defence response is the synthesis of the so-called pathogenesis-related (PR) proteins. We have studied the nature, structure, and subcellular localization of the different PR proteins upon salicylic acid treatment and Pseudomonas syringae infection of Nicotiana tabacum plants. In both test systems, we could demonstrate that the PR protein fraction of tobacco consists of at least 20 to 25 different proteins, including s (1–3)-glucanases, chitinases, peroxidases, thaumatin-like proteins, the PR1 class proteins and a proteinase inhibitor-like protein. Moreover, several classes of these PR proteins segregate into specific vacuolar and secreted isoforms. Here, we present a model which could explain the role of the compartimentalized PR s (1–3)-glucanases and chitinases within the regulation of the defence response.
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