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Proceedings Paper

Chlorophyll fluorescence induction kinetics as a tool to determine the herbicide effect on algae and leaves
Author(s): Bernhard Ruth
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Paper Abstract

The initial phase of the chlorophyll fluorescence induction kinetics provides information about the action of herbicides. Measurements on algae and on wheat show a change in the curve shape in the first 60 ms when the herbicides DCMU, atrazine, and terbuthylazine are applied with concentrations between 0.5-200 (mu) g/l. As the measurements are non-destructive, repeated measurements at one site of the wheat leaf can monitor the increasing herbicide concentration after the application to the roots. An empirical parameter Br derived from the fit of the initial phase with two exponential functions estimates the degree of the inhibition induced by the herbicide. The measured curves can also be analyzed in terms of the usual PS-model. This yields the parameter Bb which estimates the relative contribution of the blocked PS-centers to the fluorescence. As both parameters, Bb and Br, exhibit an equivalent course in their dependence on the herbicide concentration, they scale the relative portion of the blocked PS-centers for a given herbicide concentration.

Paper Details

Date Published: 23 May 1997
PDF: 12 pages
Proc. SPIE 3107, Remote Sensing of Vegetation and Water, and Standardization of Remote Sensing Methods, (23 May 1997); doi: 10.1117/12.274740
Show Author Affiliations
Bernhard Ruth, GSF--National Research Ctr. for Environment and Health (Germany)

Published in SPIE Proceedings Vol. 3107:
Remote Sensing of Vegetation and Water, and Standardization of Remote Sensing Methods
Giovanna Cecchi; Torsten Lamp; Rainer Reuter; Konradin Weber, Editor(s)

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