PHOTOSYNTHETIC PHOSPHORYLATION AND THE ENERGY CONVERSION PROCESS 403 



phorylation of mitochondria. Photosynthesis of green plants now provided 

 both the substrates and oxygen to make oxidative phosphorylation and 

 aerobic life on this planet possible. 



An interesting aspect of the relation between photosynthetic and 

 oxidative phosphorylation in biochemical evolution is the common 

 phylogenetic relationship between proplastids and mitochondria, as it was 

 recently reported by Miihlethaler and Frey-Wyssling [171]. Their obser- 

 vations on proplastid development in embryonic cells suggest that mito- 

 chondria followed rather than preceded chloroplasts as functional 

 organelles in cellular metabolism. This is in harmony with the biochemical 

 evidence, since photosynthetic phosphorylation by chlorophyll-containing 

 particles, being independent of molecular oxygen, could occur before 

 oxidative phosphorylation by mitochondria, which requires molecular 

 oxygen (95). 



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