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Conference Paper

Fluorescence Measurements as Indicator of Adaptation Strategies in an Abundant Tree Species from Central Amazonian Floodplain Forests

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons56985

Waldhoff,  Danielle
Working Group Tropical Ecology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons56754

Junk,  Wolfgang Johannes
Working Group Tropical Ecology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Citation

Waldhoff, D., Junk, W. J., & Furch, B. (2002). Fluorescence Measurements as Indicator of Adaptation Strategies in an Abundant Tree Species from Central Amazonian Floodplain Forests. In R. Lieberei, H. Bianchi, V. Boehm, & C. Reisdorff (Eds.), Neotropical Ecosystems: Proceedings of the German-Brazilian Workshop, Hamburg 2000 (pp. 573-577). Geesthacht: GKSS-Forschungszentrum.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-DDE2-5
Abstract
Symmeria paniculata is a common, evergreen tree species in the lowest part of the flooding gradient in black water inundation forests in Central Amazonia (Brazil) which does not shed submerged leaves. Chlorophyll a fluorescence was measured in aerial and submerged leaves in 1999-2000. Measurements were performed at up to 8 m under water. The Fm/Fv values ('current photochemical capacity' of photosystem II) in leaves submerged at 0-1 m depth were above the lower limit of natural variation of healthy leaves (>0.7), indicating an undamaged photochemical apparatus. Leaves submerged at 1-8 m depth (up to 175 days inundation at the time of measuring) showed Fv/Fm values between 0.6 and 0.4. The recovery of these Fv/Fm values to ³0.7 during falling water levels apparently took place still under water. Rapid light curves (RLC) of leaves submerged at >1 m depth revealed that PS II started with electron transport when lighted. However, the electron transport was apparently inhibited shortly after the start. A negative correlation was found between the inhibition of electron transport and the depth/duration of inundation