L5.1 Proteobacteria_Alphaproteobacteria Flashcards
(32 cards)
stands out for its
vast diversity in habitat, metabolism, and
lifestyle, being the largest bacterial
phylum
Proteobacteria
What are the metabolic strategies of proteobacteria?
Photosynthesis
Chemo-heterotrophy
Nitrogen fixation
What are the classes under proteobacteria?
Alpha
Beta
Gamma
Delta
Epsilon
Zeta
the most dominant
in the oligotrophic proteobacteria.
Alphaproteobacteria
Unusual metabolic modes of a-proteobacteria
Methylotrophy
Chemolithotrophy
Ability to fix nitrogen
Methylotrophy
grow using methane (methylobacterium)
Chemolithotrophy
electron sources from inorganic compounds (nitrobacter)
Nitrogen fixer example
Rhizobium
What are the orders under Alphaproteobacteria
Rhizobiales
Rickettsiales
What are the genera under Rhizobiales
Bartonella, Methylobacterium
Pelagibacter
Rhizobium
Agrobacterium
Majority of the a-proteobacteria are under what order?
Rhizobiales
Describe the order rhizobiales
phototrophs, chemolithotrophs, symbionts, nitrogen-fixing bacteria
a polyphyletic collection of genera, form root nodules and fix
nitrogen in symbiotic association with
leguminous plants
Rhizobia
Genus under Rhizobiales
Rhizobium
Agrobacterium
Methylobacterium
Bartonella
Pelagibacter
Rhizobium
Forms root nodules and fixes nitrogen with leguminous plants
Agrobacterium
Crown gall disease, pathogenic
Methylobacterium
Capable of using methane as carbon source, and can be cultivated in vitro with methanol
Bartonella
Causes trench fever, cat scratch diseases
arthopod vectors, fastidious
species under Bartonella
quintana, henselae, bacilliformis
Pelagibacter
photic zone of ocean
oligotroph, obligate aerobic, chemoorganotroph
Describe the order rickettsiales
-intracellular parasites and mutualist with arthropods
How do you cultivate rickettsiales?
cultivated on host cells such as chicken or tissue culture since they are intracellular
Describe Rickettsia
-cause typhus, Rocky mountain spotted fever
vectors of rickettsia diseases
arthropod diseases such as ticks, fleas, lice and mites