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Lecture

Cryptophyta.docx

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Department
Biology
Course Code
BIOL-2152
Professor
Kent Simmons

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Cryptophyta “hidden”: because they are so fragile, they disintegrate, don’t show up in samples very much  Phytoplankton of both freshwater and marine environments Not all photosynthetic, but all are heterotrophic  Many photosynthetic retain ability to eat prey Unicellular, rarely colonial Bean shaped Dorso­ventrally flattened  Lack cell wall Outer portion of the cell/peroplast  1­2 chloroplasts storage material: starch/starch like chlorophylls a and c2, phycobilins,  fucoxanthin: main carotenoid.  presence of phycoerythrin or phycocyanin implies ancestral relationship with red algea and  cyanobacteria phycobilins are not organized in phycobilisomes as in cyanobacteria but are located within the  lumen of the thylakoids  adapted to low light conditions and bloom in deeper, colder water, similar to red algea alloxanthin is unique accessory pigment found in cryptophyta pyrenoid: location where enzymes to create storage products are stored.   when a chloroplast is present, it has 2 lobes joined by a cenral pyrenoid. Chloroplast surrounded by  2 membranes of Endoplasmic reticulum and 2 membranes of chloroplast envelope. Nucleomorph  between 2  and 3  membranes. (secondary endosymbiosis). Btwn outer chloroplast membrane (2)  and inner chloroplast endoplasmic reticulum (3) is the nucleomorph  nucleomorph copies all its DNA, and seperates its DNA while the chloroplast divides lack cell wall. Have a periplast: plasma membrane or series of plates underneath plasma  membrane  number and shape of plates important in each group contractile vacuole flagella 2 or more  subapical arise in anterior invagination longer(tinsel) flagellum has 2 rows of mastigonem
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