Algae: Vegetative Structure

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  • Topic: Algae, Red algae, Plant
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  • Published : February 27, 2013
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ALGAE

VEGETATIVE STRUCTURE
Thallus- body of algae
* Holdfast (root)
* Stipe (stem)
* Blade (leaf)

Pneumatocyst-gas filled chamber

LIFE CYCLE
Asexual (Fragmentation)
Sexual

NUTRITION
Photoautotrophic

DIFFERENT PHYLA
1. Phaeophyta / Brown A
* Kelps
* Algin-thickener (ice cream, lotions)

2. Rodophyta / Red A
* Deeper
* Agar
* Carageenan- thickener evap, ice cream, drugs; from Irish Moss * Gracillaria spp.- food source

3. Chlorophyta / Green A
* Uni/multi
* Cellulosic cell wall
* Store starch
* Give rise to terrestrial plants
a) Desmids- uni c (bananas)
b) Spirogyra- filamentous; green strands
c) Chlamydomonas- biflagellated; stigma
d) Volvox- colonial alga; biflagellated
e) Euglena- chloroplast| Algae: Stigma; 1 flagellum; pellicle| Proto: cystostome

4. Baccillariophyta / Diatoms
* Cell wall: pectin and silica
* Planktonic
* Produces DOMOIC ACID
* Sediments; diatomaceous earth

5. Dinophyta / Dinoflagellates
* Plankton
* Fire algae
* Alexandrium- red tide
* Gambierdiscus toxicus

6. Oomycota / Water Molds
* Carry photosynthesis; plant parasites
* Phytophora (Potato Blight)

7. Charophyta / Stoneworts
* Ancestor of mosses
* Chlorophyll a and b

8. Chrysophyta / Golden Algae
* Chlorophyll a and c
* Accessory pigment: fucoxanthin
* Laminarin and chrysolaminarin
* Unequal flagella

9. Cyanobacteria (Blue-green algae)
* Lacks nucleus
* Phycolbilins
* Spirulina- high protein dietary supplement

ROLES:

1. Food Chain
2. 80% Earth’s O2
3. Petroleum
4. Symbiosis
5. Decomposition of O2 in H2O

ALGAE as entrée

LAMINARIA
-Kombu (J)
-Hai dai (C)

PORPHYRA
-Nori; Amanori (J)
-Zicai (C)

UNDARIA
-Wakame

ASPARAGOPSIS TAXIFORMIS
-Limu kohu

CODIUM
-Limu wawaeiole

GRATELOUPIA FILCINA
-Limu huluhuluwaena

ULVA
-Limu...
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