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Protocols in ecological and environmental plant physiology

 

Article << Previous     |     Next >>   Contents Vol 37(5)

Monitoring of cold and light stress impact on photosynthesis by using the laser induced fluorescence transient (LIFT) approach

Roland Pieruschka A B E, Denis Klimov C, Zbigniew S. Kolber D, Joseph A. Berry B

A Forschungszentrum Jülich, Phytosphäre ICG III, 52425 Jülich, Germany.
B Carnegie Institution of Washington, Department of Global Ecology, 260 Panama Street, Stanford, CA 94305, USA.
C Monterey Bay Aquarium Research Institute, 7700 Sandholdt Road, Moss Landing, CA 95039, USA.
D Institute of Marine Sciences, 1156 High Street, Santa Cruz, CA 95064, USA.
E Corresponding author. Email: r.pieruschka@fz-juelich.de
 
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Abstract

Chlorophyll fluorescence measurements have been widely applied to quantify the photosynthetic efficiency of plants non-destructively. The most commonly used pulse amplitude modulated (PAM) technique provides a saturating light pulse, which is not practical at the canopy scale. We report here on a recently developed technique, laser induced fluorescence transient (LIFT), which is capable of remotely measuring the photosynthetic efficiency of selected leaves at a distance of up to 50 m. The LIFT approach correlated well with gas exchange measurements under laboratory conditions and was tested in a field experiment monitoring the combined effect of low temperatures and high light intensity on a variety of plants during the early winter in California. We observed a reduction in maximum and effective quantum yield in electron transport for Capsicum annuum L., Lycopersicon esculentum L. and Persea americana Mill. as the temperatures fell, while a grass community was not affected by combined low temperature and high light stress. The ability to make continuous, automatic and remote measurements of the photosynthetic efficiency of leaves with the LIFT system provides a new approach for studying and monitoring of stress effects on the canopy scale.

Keywords: avocado, chilling stress, chlorophyll fluorescence, electron transport rate, evergreen plant, pepper, PSII efficiency, remote sensing, tomato.


   
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