BIOL3711 Lecture Notes - Lecture 2: Golden Algae, Chrysophyta, Carotenoid
26 Jun 2018
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Diatoms – no flagellates
Microalgae
Phytoplankton
Unicellular
No flagellates
Mostly unicellular
Characteristics
Organization
oUnicellular or chain-like
Cell covering
oFrustule
Silica shell, consists of 2 valves
oEpitheca
Larger valve
oHypotheca
Smaller valve
oGirdle bands
Loops of silica inserted between the valves
oGirdle view
Valve is seen from the side
oValve view
Valve is seen from the face
Other structures on the wall:
oMarkings, holes, spines
Chloroplasts
oGolden brown
oMajor pigments:
Chlorophyll a, c NOT b
oAccessory pigments
B-cartene, fucoxanthin, diatoxanthin
Energy reserve
oOil and leucosin NOT starch
Non-flagellate
oNo flagellum
Locomotion
oMucilage secretion through raphe
oRAPHE:
A slit on the valve
Long line running through valve
Function:
Movement
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Document Summary
Silica shell, consists of 2 valves: epitheca. Loops of silica inserted between the valves: girdle view. Valve is seen from the side: valve view. Other structures on the wall: markings, holes, spines. Chlorophyll a, c not b: accessory pigments. Energy reserve: oil and leucosin not starch. Locomotion: mucilage secretion through raphe, raphe: Provides channel for secretion of mucilage and push algae. Many centric diatoms have spines (setae: genus: Valve bears a regular pattern of holes. Each being a small chamber that opens up to the outside and inside for nutrient uptake: genus: Bilaterally arranged markings about the long axis of the valve face: genus: Symmetrical in both girdle and valve views. Asexual: cell division to produce two daughter cells. Sexual: occurs in cells that are less than 30% of the maximum size for the species, autospore. Enlarged cell resulted from sperm and egg fertilization. Fertlisation of an egg by a sperm results in a zygote.
