ENVIRONMENTAL REDOX AND PHOTOSYNTHESIS€¦ · Progressive evolution of tetrapyrole ring system for...
Transcript of ENVIRONMENTAL REDOX AND PHOTOSYNTHESIS€¦ · Progressive evolution of tetrapyrole ring system for...
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ENVIRONMENTAL REDOX AND PHOTOSYNTHESIS
Concepts: Biogeochemical gradients according to the electron tower, redox calculations, anaerobic metabolisms, photosynthetic electron donors, anoxygenic and oxygenic photosynthesis, electron transport in photosynthetic organisms, photosynthetic pigments and reaction centers, geological record of oxygenic and anoxygenic photosynthesis.
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Electron transport in purple bacteria
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Z- Scheme of electron transport in cyanobacteria and green plants
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MAJOR PHOTOSYNTHETIC PIGMENTS
BACTERIOCHLOROPHYLL A Anoxygenic
CHLOROPHYLL A Oxygenic
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Progressive evolution of tetrapyrole ring system for higher energy, lower λ excitation
Chemical structures of (a) bacteriochlorophyll a and (b) chlorophyll a. Differences in the structures are shown in red. Chemical structures of (c) 3-acetyl-chlorophyll a and (d) chlorophyll d. R is the phytyl tail. 6
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Phylogeny of bch and chl genes
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Increasing excitation energy
Ancestral and yield Purple Bacterium
Fe 2+ Incorporated or S2-
3+ from a Green S-Fe B cterium ?? or S0 a
Evolving pigment and redox components
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Evolutionary stages of
oxygen evolution capacity (OEC). Four stages are depicted, although additional intermediate stages undoubtedly also existed. For each stage, the upper diagram shows an energetic picture, and the lower diagram a schematic of the reaction center protein in the photosynthetic membrane.
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4500 500 million years 4000 2500
O2
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MODERN ANOXYGENIC PHOTOSYNTHETIC BACTERIA IN DEEPER LAYERS OF MICROBIAL MATS
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MODERN ANOXYGENIC PHOTOSYNTHETIC BACTERIA IN THE WATER COLUMNS OF MEROMICTIC LAKES
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An obligately photosynthetic bacterial anaerobe from a deep-sea hydrothermal vent
Copyright © 2005 National Academy of Sciences, U.S.A. Source: Beatty, J. T., et al. “An ObligatelyPhotosynthetic Pacterial Anaerobe from a Deep-Sea Hydrothermal Vent.” PNAS 102 (2005): 9306–10.
Beatty J T et al. PNAS 2005;102:9306-9310 ©2005 by National Academy of Sciences 12
Beatty J T et al. PNAS 2005;102:9306-9310
Copyright © 2005 National Academy of Sciences, U.S.A. Source: Beatty, J. T., et al. “An ObligatelyPhotosynthetic Pacterial Anaerobe from a Deep-Sea Hydrothermal Vent.” PNAS 102 (2005): 9306–10.
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KARIJINI NATIONAL PARK –WESTERN AUSTRALIA
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BANDED IRON
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This image has been removed due to copyright restrictions. Please see the photo of rock in paperbelow. Mojzsis, Stephen James, Gustaf Arrhenius, et al. "Evidence for Life on Earth Before 3,800Million Years Ago." Nature 384, no. 6604 (1996): 55-9.
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Precambrian Banded Iron Formations (BIFs) (Adapted from Klein & Beukes, 1992)
.ev axi Mat Canadian Greenstone Belts & Hamersley, W. Australia el asR Yilgaran Block, W. Australia Transvaal, S. Africa
FI oup
Pongola Glaciation, Swaziland Paleoproterozoic (Huronian) Snowball Earth B r G (snowball??) Lake Superior, USA
of yl Zimbabwe, Ukraine, Krivoy Rog, Russia Neoproterozoic e bu
ndan
c s Venezuela, W. Australia Snowball Earths
er Labrador, Canada
am
Isua, West Rapitan, Canada Greenland H Urucum, Brazil
o Damara, Namibia A t
4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0
Time Before Present (Billion Years) Courtesy of Joe Kirschvink. Used with permission.
Courtesy Joe Kirschvink, CalTech
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Red beds
Photos: Kansas Geological Survey
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Paleosols
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on http://www.gly.uga.edu/railsback/FieldImages/OrgeonBasaltPaleosol1.jpeg.
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Fe2+ + CO2 CH2O + 4FeOOH
Fe2+
Fe2+
(Canfield et al. 2006, Kharecha et al. 2005, Kappler et al. 2005)
Photic zone
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Image by MIT OpenCourseWare.
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H2O + CO2 CH2O + O2 Photic zone
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STROMATOLITE RECORD OF MICROBIAL INTERACTIONS WITSEDIMENTS
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H
Bosak et al., 2013 21
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Allwood et al. 2007
3.4 Ga 1.2 Ga
Photo: P. Hoffman Jones et al. 1998 1 mm
modern
= ?
= ?
STROMATOLITES AS INDICATORS OF MICROBIAL PROCESSES
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ancient modern (2.7Ga)
Jones et al. 1998
1cm
regularly occurring inter-column laminae © copyright owners. All rights reserved. This content is excluded from our Creative Flannery et al., 2012 Commons license. For more information, see http://ocw.mit.edu/help/faq-fair-use/. 23
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STROMATOLITE MORPHOLOGY AND OXYGENIC PHOTOSYNTHESAT 2.7 GA?
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paper online at http://www.mdpi.com/2076-3263/2/4/235.
IS
Sim et al. 2012 24
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STROMATOLITE MORPHOLOGY AND OXYGENIC PHOTOSYNTHESIAT 2.7 GA?
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Sim et al. 2012
S
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STROMATOLITE MORPHOLOGY AND OXYGENIC PHOTOSYNTHESIAT 2.7 GA?
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Bosak et al. 2013 26
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4500 4000 2500 500 million years
O2
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CHLOROPHYLL-C PLANKTON
DIATOMS COCCOLITHOPHORIDS
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