lab reading - pigments

lab reading - pigments - Figure 28.2 Diversity of plastids...

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Figure 28.2 Diversity of plastids produced by secondary endosymbiosis All plastids evolved from gram neg cyanobacteria that was engulfed by an ancestral heterotrophic eukaryote The ancestor then diversified into red and green algae and then those were engulfed by other eukaryotes (secondary endosymbiosis) STEP BY STEP: Heterotrophic bacteria engulfs cyanobacteria = primary endosymbiosis Diversifies into red and green algae Each one has a secondary endosymbiosis o Algae is engulfed by a eukaryote Red: o Becomes dinoflagellates, apicomplexans, stramenopiles Green: o Becomes euglenids, chlorarachniophytes Pg 586 Golden algae Characteristic color comes from yellow and brown carotenoids The cells are biflagellated – both flagella attached near one end of the cell All are photosynthetic, some are mixotrophic Mixotrophs can absorb dissolved organic compounds or ingest food particles by phagocytosis Most are unicellular Some are colonia though Brown algae Largest and most complex All are multiceullar, most are marine Common along temperate coasts where water is cool Brown or olive color because of carotenoids in their plastids
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Seaweeds Have some specialized tissues and organs that are similar to plants but its ANALOGOUS Thallus – refers to an algal body that is plantlike o However, unlike plant a thallus lacks true roots, stems and leaves o Instead has rootlike holdfast, stemlike stipe, leaflike blades o Cell walls are made of cellulose and gel forming polysaccharides that
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