Laser-induced imaging of blue/red and blue/far-red fluorescenceratios, F440/F690 and F440/F740, as a means of early stress detection inplants

摘要

Green plants exhibit a blue (F440), green (F520), red (F690) andfar-red (F740) fluorescence emission. These laser-induced fluorescence(LIF) signatures and ratios allow an early stress diagnosis. Thefluorescence ratios blue/red (F440/F690) and blue/far-red (F440/F735)proved to be very sensitive indicators of ongoing stress events. Thishas been demonstrated by fluorescence emission spectra and the newfluorescence imaging technique. High-light, water and temperature stressas well as nitrogen deficiency, herbicide application, or attacks bymites, etc., can easily be monitored via increasing or decreasingfluorescence ratios and images