| Zugriffsnummer | 14569 |
| Dokumenttyp | Konferenzartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Spatial and temporal distribution of magnetic field due to injury currents in Vicia faba plants |
| Autor(in); Institution |
Jazbinsek, V.; Institute of Mathematics, Physics and Mechanics, University of Ljubljana, SLOVENIA
Thiel, G.; Pflanzenphysiologisches Institut, Universität Göttingen, GERMANY
Wübbeler, Gerd; 8.21, Bioelektrizität und -magnetismus, PTB-Berlin
Müller, Wolfgang; 8.21, Bioelektrizität und -magnetismus, PTB-Berlin
Trontelj, Z.; Institute of Mathematics, Physics and Mechanics, University of Ljubljana, SLOVENIA
|
| Quelle/Jahr | BIOMAG 2000 : Proceedings of the 12th International Conference on Biomagnetism: August 13 - 17, 2000, Helsinki University of Technology, Espoo, Finland:(2001), 999 - 1001 |
| Availability | [CD-ROM] ; file name: 0999.pdf |
| ISBN | 951-22-5401-8 |
| Verlag | Espoo: Helsinki Univ. of Technology |
| Konferenzangaben | 12th International Conference on Biomagnetism, Espoo, 13-17, August, 2000, Finland |
| Zusammenfassung | Different types of wounds on plants cause measureable changes in the biochemical and biophysical behaviour of plants. Among them are also electrophysiological changes. Studies using extracellular and intracellular electrodes have revealed that wounding of tissue causes in a variety of plants changes in the electrical membrane voltage e.g. Typically, the electrical response consists of a rapid action potential-like depolarization followed by a slower long lasting depolarization usually termed the variation potential. The elementary basis of these transient voltage changes is not yet known. It has been speculated, that the fast transient depolarization is an action potential and is therefore propagated - just as in nerve cells - as a true long distance electrical signal. The slow voltage transient on the other hand might be the consequence of chemical signals which are distributed via the xylem. Wounding induced voltage changes are transmitted from the site of wounding along the plant with a velocity of less than 1 cm/s and reach the remote tissue before the systemic molecular responses are initiated in this tissue. We can add to these statements: Electric potential difference (voltage) in conducting living tissue is connected with ionic currents, which can also be detected magnetically as follows from the Ampere's or Biot-Savart's law. As a pathway for propagation of the electrical signal, the low resistance electrical continuum of the sieve-tube element/companion cell complex, or of the entire vein including the apoplast is suggested. To further elucidate the mechanism of electrically-based signaling, biomagnetic measurements of electrical activity in bean plants Vicia faba were conducted over the entire plant. The SQUID sensor is sensitive enough to detect very low quasi-static bio-magnetic field. The currents causing the measured biomagnetic field should be closed within a large volume. This was achieved by immersing the whole plant in a suitable ionic solution. This method has been used in the past to monitor electrical activity in animal cells, which also respond to injury with electrical activity. The measurements aim to provide information on electrical propagation, injury-induced currents and source of currents in wound stimulated tissue. |
