Bacteriology 102 - Purple Non-Sulfur Photosynthetic Bacteria

The stroma contains stacks (grana) of thylakoids, which are the site of photosynthesis.

Photosynthetic reaction center of green sulfur bacteria ..

is an older approach to the phylogenetic grouping of the photosynthetic bacteria. The following of photosynthetic bacteria appeared in the Bacteriology 102 lab manual prior to the 2nd printing of the 2nd edition in the mid-1990s (General Microbiology: A Laboratory Manual by J. A. Lindquist (ed.), McGraw-Hill/Primis Custom Publishing – retired at its edition). The anoxygenic and oxygenic groupings correspond to Sections 18 and 19, respectively, of Bergey's Manual of Systematic Bacteriology (First Ed., Vol. 3, 1989).

Falkowski PG and Raven JA (1997) Aquatic Photosynthesis. Oxford: Blackwell Scientific Press.

The evolution of photosynthesis - ScienceDirect

We also do a test that is somewhat similar in its setup (but not so much in theory) to the which utilizes Thioglycollate Medium. In Thioglycollate Medium, it is important to recall that is due only to fermentation. However, in the particular test considered here for the purple non-sulfur photosynthetic bacteria, anaerobic growth is only associated with anoxygenic phototrophy, and the categories associated with the standard oxygen relationship test (strict aerobe, facultative anaerobe, etc.) do not apply.

Sugars created in photosynthesis can be later converted by the plant to starch for storage, or it can be combined with other sugar molecules to form specialized carbohydrates such as , or it can be combined with other nutrients such as nitrogen, phosphorus, and sulfur, to build complex molecules such as and .

Algal Photosynthesis - eLS: Essential for Life Science

In C3 plants ozone induce a photosynthesis deficiency
result in substantial stresses in plant biomass and crop yields
In C4 plants it improved observable signs of foliar senescence
High [O3] decreases the total chlorophyll and carotenoids pigments
smog effects on the plant
No photosynthesis
Sunlight will be blocked and the chlorophyll will not be able to access light and begin with photosynthesis
Sulfur dioxide, a colorless, reactive gas, is produced when sulfur-containing fuels such as coal and oil are burned.
Effect of pollutants
Carbon monoxide is an odorless, colorless gas.

the green substance in leaves that permits photosynthesis

carbon monoxide from car exhaust.
Secondary pollutants: pollutants not directly polluted into the air but forms when primary pollutants react in the atmosphere, e.g ozone.
Effect of pollutants on plants
Effect of pollutants on plants
ozone effect on the plants
Sulfur dioxide
Effect of pollutants
sulfur dioxide effect of plant
SO2 causes acute foliar injury
Leaves appear bleached or pigmented with tan, reddish colour
The gas is oxidized successively to sulfite and sulfate, which interfere with photosynthesis and energy metabolism
Photosynthesis may be inhibited temporarily
The gas can influence some of the enzyme systems in the plants
Noack (1%) suggested that sulfur dioxide injury to vegetation was characterized by inactivation of the iron in the chloroplasts, interfering with its catalytic properties in assimilation.

Photosynthesis: Purple sulfur bacteria

Oxygenic photosynthesis occurs in, among others, eukaryotic microorganisms like algae and in bacteria such as cyanobacteria; the same mechanism is at work in both. Electron flow happens through two different electron transport chains that are connected; together, these electron transport chains are called the . The stars of each chain are photosystem I (PSI) and photosystem II (PSII), each containing chlorophyll reaction centers surrounded by antenna pigments.

Timeline of Photosynthesis on Earth - Scientific American

In looking for the purple non-sulfur bacteria, we find it most advantageous to set up conditions for photoheterotrophic growth, utilizing a source of light, anaerobic conditions (needed for phototrophic growth by these organisms), no hydrogen sulfide, and an organic carbon source not generally used by other bacteria under these conditions such as sodium succinate or malate. Note the medium formulas . Not only will most other types of organisms be restricted from growing, but the purple non-sulfur photosynthetic bacteria will be easily recognized by the presence of photosynthetic pigments. When substantial pigmented growth shows up in the liquid medium or is seen in the natural source, it is referred to as a "bloom."