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The phytotoxin syringomycin elicits Ca 2+ ‐dependent callose synthesis in suspension‐cultured cells of Catharanthus roseus
Author(s) -
Kauss Heinrich,
Waldmann Thomas,
Jeblick Wolfgang,
Takemoto Jon Y.
Publication year - 1991
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1991.tb01725.x
Subject(s) - callose , catharanthus roseus , phytotoxin , elicitor , biology , biochemistry , cell wall , botany , chemistry , microbiology and biotechnology , toxin , enzyme
Deposition of the 1,3‐β‐glucan callose onto the cell wall represents one of the defence reactions of plants against pathogens. This process can be induced in suspension cells of Catharanthus roseus by subtoxic concentrations of the bacterial phytotoxin syringomycin and is associated with a slight increase in Ca 2+ uptake and some K + release. Under these conditions callose formation can be prevented by complexing external Ca 2+ , indicating that some Ca 2+ uptake is essential as a signal. However, higher syringomycin concentrations elicit increased Ca 2+ uptake without increasing callose formation, although the potential for callose synthesis is not exhausted – as shown using digitonin as an additional elicitor. These results suggest that, superimposed on Ca 2+ , another, yet unknown signal is also involved in the regulation of callose synthesis.