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Lecture

Chlorophyta (Green Algae)

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Department
Biology
Course
BIOL-2152
Professor
Kent Simmons
Semester
Winter

Description
PHYLUM CHLOROPHYTA The green algea After primary endosymbiosis  Archeoplastida (red and green)  Grow in waters of a great range of salinity  Oligotrophic freshwater to marine to high salinity Unicellular, colonial, filamentous, membranous and tubular  Never seem to take over, create large blooms  Most distinct organielle is the chloroplast Chlorophylls a and b Form starch (storage molecule) within the chloroplast, in association with a pyrenoid Envelope composed of 2 membranes and contains thylakoids joined in groups of 2 or 6 Photosynthetic pathways similar to those of the higher plants  Have a light sensing organ (eyespot) but very different design. Pigmented layer of membranes  inside the chloroplast. Its interaction with light changes the movement of the flagella 2 whiplash flagella  contractile vacuoles usually 2 at the base of the flagella they contract alternately with rapid contraction eyespot eyespot inside the chloroplast  when the pigments are excited is to change the microtubular arraignment inside the cell and  change the rhythm of the flagella beat  cell division 2 types of interzonal spindles(do not attach to the chromosomes)  persistant type  collapsing type  the new cell wall can be formed by means of  a phycoplast (cell plate) charophyceae. Cell plate aggregate around the persisting microtubular  apparatus  a cleavage furrow ulvophyceae . spindle contracts, pulls all ends of the cytoplasm in and the cell  wall is built from enzymes imbedded in the cell membranes. Build cell wall externally or phragmoplast chlorophyceae. Spindle apparatus breaks down  tiny vesivles and microfilaments form parallel to further cell was.  Asexual reproduction Very rapid  Usually preformed during times of good environmental conditions  Fragmentation of colonies, or filaments into two or more parts, each becoming a new colon
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