Functional Diversity
What electron donor do purple sulfur bacteria primarily use for photosynthesis?
Hydrogen sulfide (H₂S)
In what type of aquatic environment do purple sulfur bacteria thrive at the chemocline?
Meromictic lakes
True or False: Purple non-sulfur bacteria are always purple.
False
What mineral did Alarcón et al. (2024) show purple sulfur bacteria can grow on?
Pyrite (FeS₂)
What cycle do purple sulfur bacteria use to fix CO₂?
Calvin cycle
Which genus includes halophilic and alkaliphilic purple sulfur bacteria found in soda lakes?
Ectothiorhodospira (family Ectothiorhodospiraceae)
What is the primary metabolic mode of purple non-sulfur bacteria?
Photoheterotrophy (light as energy source, organic compounds as carbon source)
n Khuong et al. (2024), inoculation with purple non-sulfur bacteria improved rice yield by what percentage compared to the control?
27.7%
Name one alternative sulfur compound (besides H₂S) that purple sulfur bacteria can use as an electron donor.
Thiosulfate (S₂O₃²⁻)
What thermophilic purple sulfur bacterium inhabits sulfide-rich hot springs?
Thermochromatium
Name two genera of purple non-sulfur bacteria from the Alphaproteobacteria group.
Rhodospirillum, Rhodobacter, Rhodomicrobium
What major gene group was upregulated (up to 200-fold) in purple sulfur bacteria growing on pyrite?
Cytochrome genes (for extracellular electron transfer)