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Abstract

Damaged spruce needles show a smaller rise from ground level fluorescence (Fo) to maximum fluorescence (Fm) of the fast component of the Kautsky effect, and a corresponding smaller decline (Fd) to the steady state fluorescence (Fs) of the slow component of the Kautsky effect, relative to healthy needles. Fm/Fo and (Fm - Fs)/Fs or RFd derived photosynthesis indices are also correspondingly lower for metal-stressed versus non-stressed needles, and indicate a disfunctioning of the photosynthetic apparatus in the damaged needles and a consequent decrease in their photosynthetic capacity. A strong linear relationship occurs between the Fm/Fo indices of the fast component of the Kautsky effect and needle chlorophyll a content, although less strong relationships occur with respect to chlorophyll b and a+b contents, as well as between the RFd indices of the slow component of the Kautsky effect and needle chlorophyll a, b, and a+b contents. It is possible to utilise chlorophyll fluorescence induction kinetics as a fast and reliable means to predict the chlorophyll content of plant foliage, in addition to providing an indicator of plant vitality.

Additional information

Authors: BANNINGER C, Institute for Image Processing and Computer Graphics, Joanneum Research, Graz (AT);SCHMUCK G, JRC Ispra (IT)
Bibliographic Reference: Paper presented: International Symposium on Environmental Sensing, Berlin (DE), June 22-26, 1992
Availability: Available from (1) as Paper EN 36879 ORA
Record Number: 199210829 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en