Difference Between Endospore and Exospore

What are spores?

Spores are the unicellular and reproductive structure, which are greatly resistant to extreme environmental conditions, like high temperature, pH, salt concentration, etc. Such reproductive structures exist in variable, sizes, shapes and numbers. The phenomena of the formation of spores by the vegetative cells are termed as Sporulation or Sporogenesis.

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Based on the positions, these spores are broadly classified into two types:

  1. Endospore
  2. Exospore

Endospore and Exospore

Endospores and exospores are two varieties of spores or the reproductive structures generated as resting systems.

Endospore is the common type of spores produced mainly by bacteria.

Exospores are produced in the eukaryotic cells of fungi, algae and cyanobacteria. Endospores are formed inside the mother cell, whereas, exospores are formed towards the end of the mother cell and released as bud.

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Here, in this article let us explore more in detail about the differences between Endospore and Exospore.

Endospore and Exospore – Differences

differences between Endospore and Exospore

Endospore Exospore
Endospores are generated by the Clostridium Bacillus and Sporosarcina bacteria. Exospores are produced by the members of the phylum Actinobacteria.
Formed within or inside the vegetative cell. Formation outside the vegetative cell.
It is a structure formed by bacteria. It is an asexual spore that is separated from the mother cell.
Cell division is not involved in the formation of endospores. Exospores are produced by the cell division.
Endospores are released by rupturing the mother cell. Exospores are released by budding.
Only one endospore is produced by a single organism Several exospores are produced by a single organism
Examples of endospores include Bacillus anthracis, Bacillus cereus, Bacillus thuringiensis, Clostridium botulinum, Clostridium tetani, etc. Examples of exospores include Conidiospores, streptomyces, actinobacteria and diverse groups of fungi, algae and Cyanobacteria.

This concludes the major difference between the endospores and exospores. For more information on spores, sporulation, its types and functions, keep visiting our website at BYJU’S Biology.



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