The phenomenon of pulse alteration of bioelectric potential difference (BEPD) U_(Beta ) approximately 10 mV between the top and the base of a plant is observed when a leaf is irradiated locally by a low intensity laser beam ((lambda) equals 632.8 nm, W approximately 40 mW/cm²). This effect is absent completely if an infrared laser ((lambda) equals 828.3 nm, W approximately 40 mW/cm²) is used for irradiation. There exists a threshold value of the background illumination below which U_(Beta ) equals 0. The speed of U_(Beta ) propagation from the irradiated zone along the axes plant organs is around 8 mm/sec. We observed the effect of U_(Beta ) transmission from the irradiated two weeks plant cucumber to a nonirradiated one, if the plant roots are contacting in the soil. We observed also the complex periodic BEPD response to the periodic local laser irradiation.

Date Published: 17 June 1993
PDF: 10 pages
Proc. SPIE 1922, Laser Study of Macroscopic Biosystems, (17 June 1993); doi: 10.1117/12.146172

Published in SPIE Proceedings Vol. 1922:
Laser Study of Macroscopic Biosystems
Jouko E. Korppi-Tommola, Editor(s)