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Systemin transiently depolarizes the tomato mesophyll cell membrane and antagonizes fusicoccin‐induced extracellular acidification of mesophyll tissue
Author(s) -
MOYEN C.,
JOHANNES E.
Publication year - 1996
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1996.tb00338.x
Subject(s) - fusicoccin , depolarization , extracellular , efflux , biophysics , cell , biology , microbiology and biotechnology , membrane potential , biochemistry , signal transduction , membrane , chemistry , enzyme , atpase
The plant polypeptide signal systemin induces proteinase inhibitor synthesis in tomato leaves. We show here that systemin elicits a transient depolarization of the tomato mesophyll cell membrane. Furthermore it triggers a transient decrease in the external pH of the mesophyll tissue which is followed by a sustained pH increase. In the presence of fusicoccin (which has been shown to antagonize the synthesis of proteinase inhibitors) the depolarization and transient H + efflux are attenuated whereas the slower phase of the sustained electroneutral H + influx persists. These results suggest that systemin‐induced changes in ion transport play a role in the early phases of systemin signal transduction.