TAILIEUCHUNG - Báo cáo khoa học: Salicylic acid and the hypersensitive response initiate distinct signal transduction pathways in tobacco that converge on the as-1-like element of the PR-1a promoter

Tobacco pathogenesis-related protein 1a (PR-1a) is induced in plants during the hypersensitive response (HR) after exposure of plants to salicylic acid (SA) and by develop-mental activation by these diverse stimuli is mediated via anas-1-like element in the PR-1aupstream further analyze the significance of thiscis-acting sequence, an authentic as-1element from the cauliflower mosaic virus 35S RNA promoter was inserted into the PR-1apromoter in place of theas-1-like motif. | Eur. J. Biochem. 270 4876-4886 2003 FEBS 2003 doi Salicylic acid and the hypersensitive response initiate distinct signal transduction pathways in tobacco that converge on the as-1-like element of the PR-1a promoter Rose Gruner Georg Strompent Artur J. P. Pfitzner and Ursula M. Pfitzner Universitat Hohenheim Institut fur Genetik FG Allgemeine Virologie Stuttgart Germany Tobacco pathogenesis-related protein 1a PR-1a is induced in plants during the hypersensitive response HR after exposure of plants to salicylic acid SA and by developmental cues. lene ccliaalinn by thshe divrsse stimuli is mediated via an as-1-like element in the PR-1a upstream region. To n ith r analyse the significance ol thís cis-acting sequence an authentic as-1 element from the cauliflower mosaic virus 35S RNA promoter was inserted into the PR-1a promoter in place of the as-1-like gene analysis in transgenic tobacco plants demonstrated that as-1 can functionally replace the as-1-like element in the PR-1a promoter in response to all stimuli. However. reporter gene induction from the as-1 carrying promoter was enhanced in response to SA compared to the wild-type promoter and the ratio of reporter gene activities in SA treated leaf tissue to tissue exhibiting the HR increased with the as-1 promoter construct. Our íìndíngs u-ppoott a modhll where PR-1a gene expression relies on at least two distinct signal transduction pathways initiated by SA and by a yet unknown signal produced during the HR that promote different albeit related transcription complexes on the PR-1a as-1-like element. A a ía of PR-1 proVeins in plains expressing salicylate hydroxylase yielded additional evidence that an HR dependent pathway leads to high level PR-1 gene induction in tobacco. Keywords GUS reporter gene expression PR-1 protein induction salicylate hydroxylase transgenic tobacco plants. Infection of plants with pathogens usually results in a distinct host response .

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