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Reproduction in Nostoc | Free Biology Notes

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In this article we will discuss about reproduction in nostoc.

Reproduction in Nostoc

Nostoc is reproduced only by asexual methods. The sexual reproduction is completely absent. asexual reproduction can occur through five main methods: Fragmentation, Akinetes, Endospores, Hormogonia and Heterocysts.

1. Fragmentation

  • Nostoc can break apart into smaller pieces called fragments.
  • These fragments can then grow into new individuals under favorable conditions, essentially creating clones of the parent organism.

2. Akinetes

  • Akinetes are specialized cells produced by Nostoc under unfavorable environmental conditions.
  • These cells are thick-walled and can survive harsh conditions such as drought or extreme temperatures.
  • When conditions retrun to favorable, akinetes can germinate and give rise to new individuals.

3. Endospores

  • Nostoc can produce endospores, which are dormant structures that contain all the genetic material needed to develop into new individuals.
  • These endospores can withstand adverse conditions and later germinate when the environment becomes more favorable.

4. Hormogonia

  • Nostoc can also produce hormogonia, which are specialized filaments that break off from the parent organism.
  • These hormogonia can move independently and colonize new areas where they can develop into new Nostoc individuals.

5. Heterocysts

  • Heterocysts are specialized cells within Nostoc that play a role in nitrogen fixation.
  • Although not directly related to reproduction, they are important for the survival and growth of Nostoc colonies by providing nitrogen to the surrounding cells.
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