ISSN:
1573-4994
Keywords:
Forest decline
;
chlorophyll fluorescence
;
light stress
;
time-resolved spectroscopy
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Different branches of a declined spruce were exposed to full sunlight, reduced sunlight (using a fine wire mesh), and natural shadow. Subnanosecond decay kinetics and time-gated fluorescence spectra of individual needles were measured and compared with their chlorophyll concentration. Sunlight-exposed needles showed lower chlorophyll concentrations and higher intensitiesI 3 of a long-lived fluorescent component (decay time about 3 ns) than shadow needles. This seems to be due to a reduced energy transfer from the chlorophyll antenna molecules to the reaction centres of Photosystem II. After light reduction to 15–20% during one summer season the chlorophyll concentration increased, whereasI 3 decreased, thus proving some recovery of the photosynthetic apparatus.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00727532
