Computer-assisted measurement potentials and electrical feedback Arabidopsis plants of variation

FAVRE, P., O. GUINNARD, L. JOUVE, H. GREPPIN & R. DEGLI AGOSTI (1998). Computer-assisted measurement of variation potentials and electrical feedback excita­ tions in Arabidopsis plants. Saussurea 29: 65-75. In English, French and English abs­ tracts. An installation to measure extracellular potentials in plants is presented. It allows to monitor electrical properties and also to re-inject electrical (and possibly other) signals to the plant. The whole system is controlled by a computer with an acquisition hardware (A/D-D/A) card and by an object-oriented virtual instruments programming software. Besides its stability in controlled conditions the system has been tested with classical light induced potential reactions in Arabidopsis. Characteristic responses have been observed (leaf-floral stem potential differences). After dark to light transition a decrease followed by an increase in potential in the rn V range was observed, whereas, with sorne simplification the contrary holds true in the reverse light to dark transition.