photosynthesis without bacteriochlorophyll?

Tom Bickle bickle at
Wed Apr 10 02:19:47 EST 1996

In article <4keir6$15n2 at>, "Michael F. Hynes"
<hynes at> wrote:

> hua <hua at> wrote:
> >Please help!!!    Does anyone know if there is a photosynthetic mode of 
> >metabolism in bacteria that occurs in the absence of bacteriochlorophyll 
> >or even chlorophyll?
> >
> Yes in some of the halophilic Archaebacteria there is a mechanism
> using bacteriorhodopsin which is essentially a light driven 
> proton pump. This system is described in nearly every introductory
> Microbiology text book (eg. Brock and Madigan) and most biochemistry
> text books too
> MH

True, but this is not photosynthesis, just light-driven ATP synthesis; it
is not coupled to carbon fixation.

Tom Bickle, Department of Microbiology, Biozentrum, Basel University
Klingelbergstrasse 70, CH-4056 Basel, Switzerland.
+4161 267 2120, Fax: +4161 267 2118  bickle at

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