REPRODUCTION OF NOSTOC:-
There is no report of sexual reproduction in nostoc.but sexual reproduction take place by following methods....
1:HORMOGONIA
2:AKINETES
HORMOGONIA
Hormogonium is a portion of filament between two heterocyst.during favourable condition, filaments breakup at the junction of each heterocyst.this results in the formation of a number of pieces called hormogonia.the end cells of each hormogoniumdivide to form long filament of nostoc.
AKINETES
Akinetes are non-motile spores formed from certain vegetative cells during unfavourable condition.When conditions are not favourable .certain vegetative cells become enlarge and thick walled containing reserve food called AKINETES .these are somewhat oval with outer layer EXOSPORIUM and inner ENDOSPPORIUM .At the approach of favourable conditions they germinate by rupturing by exospore and form independant filaments by simple cel division
There is no report of sexual reproduction in nostoc.but sexual reproduction take place by following methods....
1:HORMOGONIA
2:AKINETES
HORMOGONIA
Hormogonium is a portion of filament between two heterocyst.during favourable condition, filaments breakup at the junction of each heterocyst.this results in the formation of a number of pieces called hormogonia.the end cells of each hormogoniumdivide to form long filament of nostoc.
AKINETES
Akinetes are non-motile spores formed from certain vegetative cells during unfavourable condition.When conditions are not favourable .certain vegetative cells become enlarge and thick walled containing reserve food called AKINETES .these are somewhat oval with outer layer EXOSPORIUM and inner ENDOSPPORIUM .At the approach of favourable conditions they germinate by rupturing by exospore and form independant filaments by simple cel division
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