Lyngbya ppt - cyanobacteria cyanophyceae blue green algae

Lyngbya is a blue green algae or cyanobacteria of family cyanophyceae . Lyngbya ppt or presentation - All about Lyngbya in detail - classification, occurence, reproduction etc.

1. ST. JOHNS COLLEGE AGRA
DEPARTMENT OF BOTANY
SEMINAR PRESENTATION ON
LYNGBYA
PRESENTED BY-KEERTI GUPTA
SUBMITTED TO-DR. SAMUEL GORDEN SINGH
CLASS-MSC(P)
SESSION-2020-21

2. TOPIC
LYNGBYA

3. SYSTEMATIC POSITION
CLASS-CYANOPHYCEAE
ORDER-OSCILLATORIALES
FAMILY-OSCILLATORIACEAE
GENUS-LYNGBYA

4. CHARACTERISTICS
LYNGBYA IS A GENUS OF
CYANOBACTERIA OF FAMILY
OCILLATORIACEAE,IT IS
UNICELLULAR,AUTOTROPHS THAT
FORM THE BASIS OF OCEANIC FOOD
CHAIN.CELLS DEVOID OF CONSPICUOUS
NUCLEUS,ABSENSE OF ANY SEX ORGAN
AND CELL ORGANELLES.

5. OCCURENCE
MOST SPECIES ARE
BENTHIC, FORMING
MATS ON SUBTRATA OR
GROW AROUND PLANTS
IN FRESH,BRACKISH AND
MARINE WATER.SOME
ALSO GROW ON WET
ROCKS.FEW ARE
PLANKTONIC.

6. THALLUS STRUCTURE
THALLUS IS BLUE-GREEN IN COLOUR AND
FILAMENTOUS. UNBRANCHING FILAMENTS ARE
INTERWOVEN TO FORM AN EXPANDED THALLUS MASS.
EACH FILAMENT HAS A DISTINCT SHEATH(THIN TO
THICK). THERE IS A SINGLE TRICHOME IN EACH
SHEATH,WHICH IS STRAIGHT AND UNCONSTRICTED.
SHEATH IS EXTENDED BEYOND THE TRICHOME IN THE
APICAL ZONE.CELLS ARE 2-3 TIMES WIDER THAN
LONGER(DISCOID CELLS). CELLS CONTAIN GRANULAR
AND VACUOLATED CYTOPLASM.APICAL CELLS HAVE A
CALYPTRA. NO HETEROCYST.

8. REPRODUCTION
THEY REPRODUCE ASEXUALLY. THEIR
FILAMENTS BREAK APART AND EACH
OF CELL FORMS A NEW FILAMENT.
THEY FORM MOTILE HORMOGONIA.
IT IS FORMED BY DISSOLUTION OF THE
INTERCALARY CELLS OF THE
TRICHOME.