What is the Difference Between Lichen and Mycorrhizae?

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Lichen and mycorrhiza are both symbiotic relationships involving fungi, but they differ in their composition and function. Here are the key differences between the two:

  • Composition: Lichens are composed of a fungus and an alga or cyanobacterium, while mycorrhizae are composed of the roots of a higher plant and a fungus.
  • Function: Lichens involve the algae or cyanobacteria acting as the source of food for the fungus, while in mycorrhizae, the fungus increases the plant's nutrient uptake and receives products of photosynthesis from the plant in return.
  • Types of Fungi: Mostly ascomycetes and basidiomycetes form lichens, while basidiomycetes, glomeromycetes, and some ascomycetes form mycorrhizae.

In summary, lichens are associations between a fungus and an alga or cyanobacterium, and mycorrhizae are associations between a fungus and plant roots. Both relationships are mutualistic, benefiting both partners involved.

Comparative Table: Lichen vs Mycorrhizae

Lichens and mycorrhizae are both symbiotic relationships involving fungi, but they differ in their composition, source of food, and the organisms involved. Here is a table highlighting the differences between lichens and mycorrhizae:

Characteristic Lichens Mycorrhizae
Composition Composed of cyanobacteria or algae and fungi Composed of roots of higher plants and fungi
Source of Food Algae acts as the source of food for fungi Fungus benefits from the easy access to food made by the plant
Types of Fungi Involved Ascomycetes and basidiomycetes are present as fungus in lichens Glomeromycetes, Zygomycetes, Ascomycetes, and Basidiomycetes are present as fungus in mycorrhizae
Purpose Lichens can grow on bare rocks and don't have roots, making them pioneer species in primary ecological succession Mycorrhiza is a mutualistic relationship between a fungus and a plant, where the fungus grows in or on the plant roots, helping the plant absorb water and nutrients

In summary, lichens are a symbiotic relationship between a fungus and either cyanobacterium or green alga, while mycorrhizae involve fungi forming associations with plant roots. Both relationships are examples of mutualism, where both organisms benefit from the interaction.