BIOL 2004 Lecture Notes - Lecture 19: Endoplasmic Reticulum, Haptophyte, Chromalveolata
30 Mar 2017
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Primary alga is engulfed by another eukaryote and reduced to an organelle o. Plastid surrounded by 4 (or 3) membranes: gave it evolutionary changes to allow photosynthesis. Chlorophyll c (in addition to chlorophyll a) Typically large amounts of other accessory pigments: main ones are carotenoids (gives brown-yellow color, no phycobilisomes. Algae with chromalveolate plastids: haptophyta o. Stramenopile algae (e. g. diatoms: dinoflagellates (part of "alveolates") Often continuous with nuclear envelope (especially in small cells) Plastids are connected: membrane are continuous o. 4 bounding membranes (including per: a + c chlorophylls, many carotenoids. Three bounding membranes: no per, a + c chlorophylls, many carotenoids. Usually small flagellates (less than 10 micrometers: many with aflagellate stages. Usually with haptonema: microtubule-supported tentacle o. Massive blooms of emiliania (especially in north atlantic) Formation: calcium carbonate deposited on organic scale base within an endomembrane vesicle. Unique flagellar hairs (mastigonemes: usually on one flagellum if there are multiple flagella o.
