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Another proposed mechanismfor chloroplast development isthe evolution of chlorophyl ls inp rokaryotic organisms prior tosymbiogenesis
Alveolates (Chloroplasts)
Alveolates Dinoflagellates
GreenPlants
GreenAlga
Apicomplexans(lost photosynthetic Capabilityand now all parasitic)
Ciliates
Primitive Stock(Eukaryotic)
Primitive Stock(Prokaryotic)
Non-fungalMetazoa
*
*Note: acommon photoshytetic stockforEuglenozoa and Alveolatesis questionable as the two grouphave different chlorophyll types
There are two hypotheses regarding theorigins of eukaryotic cells
1. Bacteria lost cell wal l and acquiredthe vesicle making abi lity. This eventuallylead to a compartmentalization of the cytoplasm including the DNA.
2. An endosymbiogenetic eventoccured resulting in the nucleus.This may have begun as an obligateintracelluar parasi te with the abili tyto divide with the host bacterium, buteventually resulted in the genetic acquisition of all primary metaboliccontrol by the parasi te. Our "parasite"is now the nucleus.
** **Note: divergence may have occurredafter the secondary endosymbiosisresulting in photosynthetic alveolates,but then lost their plastids (not shown)