Elicitor-Induced Changes in Ca2+ Influx,K+ Efflux,and 4-Hydroxybenzoic Acid Synthesis in Protoplasts of Daucus carota L |
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| Authors: | Bach M. Schnitzler J. P. Seitz H. U. |
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| Affiliation: | Botanical Institute, University of Tubingen, Auf der Morgenstelle 1, D-72076 Tubingen, Germany. |
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| Abstract: | Suspension-cultured carrot cells (Daucus carota) and their protoplasts respond to a fungal elicitor prepared from the culture medium of Pythium aphanidermatum by accumulating 4-hydroxybenzoic acid (4-HBA). Protoplasts release the compound into the culture medium. Using 45CaCl2 as a tracer, we were able to demonstrate that the secretion of 4-HBA is preceded by a rapid increase in the Ca2+ influx and a concomitant K+ efflux. If the increased Ca2+ influx was prevented by ethyleneglycol-bis([beta]-aminoethylether)-N,N[prime]-tetraacetic acid, 4-HBA synthesis was inhibited by 70%. These results are discussed with regard to signal transduction from the plasma membrane to the nucleus of carrot protoplasts. |
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