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Microcystis - Type study
Type study
Course
Phycology, Mycology and Lichenology (3B03BOT/PLS)
8 Documents
Students shared 8 documents in this course
University
Kannur University
Academic year: 2020/2021
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MICROCYSTIS
CONTENT
▶ SYSTEMATIC POSITION
▶ OCCURRENCE &SPECIAL FEATURES
▶ THALLUS STRUCTURE
▶ REPRODUCTION
▶ REFERENCE
OCCURRENCE & SPECIAL FEATURES
- Microcystis (Gr. Mikros =small, kystis= bladder )is a fresh water colonial algae.
- It is represented by 18 species.
- Most species are euplanktonic and are aided by pseudovacuoles.
- Proliferative multiplication impart a bluish –green colour to the pond water and form <pea soup=.
- All species are free üoating, and form extensive water bloom. (M. aeruginosa)
Fig Algal bloom
THALLUS STRUCTURE
Thallus is in the form of colonies.
The colonies are free üoating and irregularly covered by colourless mucilaginous sheath.
The colony contains large number of very small cells which are spherical, elongated or ellipsoidal and lack individual sheath
Gas vacuoles are commonly present in the colony.
Each cell has a cell wall and a protoplasm which is differentiated into peripheral chromatoplasam and a central portion called centroplasam or nucleoplasam.
The central body represents an incipient nucleus
Fig. 2 Thallus structure
REPRODUCTION
- Microcystis reproduces only vegetatively
- Sexual reproduction is completely absent.
- The vegetative reproduction takes place either
- by ûssion or by fragmentation of the colony.
- The ûssion is simple cell division which takes place in all planes.
- In M. üos-aquae, nannocytes, the modiûed endospores are formed by repeated divisions of cell contents
Thank You
Anusree. M. V
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Microcystis - Type study
Course: Phycology, Mycology and Lichenology (3B03BOT/PLS)
8 Documents
Students shared 8 documents in this course
University: Kannur University
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