The reduction of protochlorophyllide is important because it allows for the performance of photosynthesis by plants. This is catalyzed by either light dependent protochlorophyllide, found in angiosperms, or light-independent protochlorophyllide, found in gymnosperms, bacterium, etc. It has been found, however, that both of these enzymes are found in some bacteria, such as Synechocystis. It was found that the bacteria could produce chlorophyll in the light and that protochlorophyllide built up when in the dark, leading to the conclusion that the light-dependent version evolved not as a necessary function of land plants but as an accessory of bacteria.
http://www.jstor.org/stable/2367424?seq=1&Search=yes&searchText=reductase&searchText=protochlorophyllide&list=hide&searchUri=%2Faction%2FdoBasicSearch%3FQuery%3Dprotochlorophyllide%2Breductase%26acc%3Don%26wc%3Don&prevSearch=&item=1&ttl=269&returnArticleService=showFullText&resultsServiceName=null
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