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Chloroplast evolution--ancient and modern

J M Whatley

    Annals of the New York Academy of Sciences
    |January 1, 1981
    PubMed
    Summary

    The theory of serial endosymbiosis explains chloroplast origins from prokaryotic and eukaryotic symbionts. Understanding algal phylogeny requires considering host-symbiont interactions and membrane homologies.

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    Area of Science:

    • Endosymbiotic theory
    • Chloroplast evolution
    • Algal phylogeny

    Background:

    • The traditional serial endosymbiosis theory posits chloroplasts originated from prokaryotic symbionts.
    • The inner and outer membranes of chloroplasts are homologous to the symbiont's plasma membrane and host's vacuolar membrane, respectively.
    • Modified theories propose secondary endosymbiosis involving eukaryotic symbionts for chloroplasts with more than two membranes.

    Purpose of the Study:

    • To explore the evolutionary origins of chloroplasts.
    • To investigate the role of secondary endosymbiosis in chloroplast evolution.
    • To understand how host-symbiont interactions influence algal phylogeny.

    Main Methods:

    • Comparative analysis of membrane homologies between chloroplasts and photosynthetic symbionts.
    • Review of existing theories on serial and secondary endosymbiosis.
    • Examination of algal phylogeny in light of endosymbiotic events.

    Main Results:

    • Evidence supports the origin of chloroplasts from both prokaryotic and eukaryotic symbionts.
    • Membrane structures provide homological evidence for endosymbiotic events.
    • Secondary endosymbiosis explains chloroplasts with more than two surrounding membranes.

    Conclusions:

    • Chloroplast evolution is a complex process involving multiple endosymbiotic events.
    • Algal phylogeny must integrate the evolutionary history of both hosts and symbionts.
    • Host-symbiont interactions significantly shape the characteristics of photosynthetic organisms.

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