Download - BOT 3:Prokaryotic Algae
Prokaryotic Chloroplast Ancestors of Plants:
Cyanobacteria and Chloroxybacteria
K. Eubacteria• General characteristics
– Prokaryotic
– Presence of cell wall (composition: peptidoglycan)
– Unicellular and microscopic
– No sexuality
• Mode of reproduction is through BINARY FISSION and FRAGMENTATION
– Metabolically diverse
• Photoautotroph, chemoautotroph, photoheterotroph and chemoheterotroph
2 types of photosynthesis
• Oxygenic photosynthesis
–Will produce oxygen
• Non-oxygenic photosynthesis
– Exhibited by sulfur bacteria
Representative organismsdivision class order genera
Cyanobacteria Cyanophyceae Chroococcales Chroococcus
Gloeocapsa
Microcystis
Nostocales Oscillatoria
Spirulina
Anabaena
Nostoc
Scytonema
Hapalosiphon
Gloeotrichia
Chloroxybacteria Prochlorophyceae Prochlorales Prochloron
Order Chroococcales• Colony forming
• Choococcus (in pairs)
Order Chroococcales• Gloeocapsa (in tetrads)
Order Chroococcales
• Microcystis (unlimited number of cells)
Order Nostocales
• Filamentous– Homocystous filament
• Oscillatoria
• Spirulina
– Heterocystous filament• Anabaena
• Nostoc
• Scytonema
• Hapalosiphon
• Gloeotrichia
Order Nostocales
• Oscillatoria
Order Nostocales• Spirulina
Order Nostocales
• Anabaena
Order Nostocales• Nostoc
Order Nostocales• Scytonema- false branching
Order Nostocales• Hapalosiphon- true branching
Order Nostocales
• Gloeotrichia
Division Chloroxybacteria• Prochloron – most probable ancestor of plants
– with chlorophylls a and b.