BIOL 336 Lecture 7: January 26th 2017
26 Jan 2017
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Document Summary
Origin of photosynthetic eukaryotic cells from a heterotrophic prokaryote: primitive phagocyte with true nucleus, er, and golgi complex, precursor of mitochondria, precursor of chloroplast, photosynthetic eukaryotic cell. Diversity and evolutionary history of plastids and their hosts: plastid family tree: many of the primary (top), secondary (middle), and tertiary (bottom) endosymbiosis events in plastid-containing eukaryotes are represented here. Secondary endosymbiosis involving red algae created a large and diverse group of eukaryotes including the major lineage known as heterokonts, which includes diatoms and kelp (some of the most abundant algal groups). But whether the red algae lineages trace back to a single secondary endosymbiont event or to several remains controversial (from p. j. Keeling, am j botany, 91:1481-93, 2004: primary endosymbiosis. Incorporation (by phagotrophy) and integration of bacteria within eukaryotic host cells. A free-living bacterium is incorporated into a phagotrophic eukaryotic cell and eventually transformed into an organelle (fig. Bacterial genes are transferred to the host cell nucleus.
