Download I am the fungi arbuscular mycorrhiza

Arbuscular mycorrhiza
I am the fungi arbuscular mycorrhiza. I am almost all over the world and live in
about 90 percent of plants. I have been found in fossalized form from the early Early
Devonian times, a time known for the development of terrestrial flora, this showed I
played a crucial role in the movement of plants from the ocean to the land, the evolution
of land plants.
I spread around the soil around the roots of plants. I grow the cell walls of plants
forming a tree like structure called an arbuscule inside the cell lumen exchanging
nutrients.
All of these terms refer to mycorrhizal structures. In arbuscular mycorrhizae, the
fungus penetrates the soil for a few centimeters (or less) around the fine roots.
I help plants, such as those with small roots, or those that lack fine root hair to take up
nutrients from the soil. I go through 3 stages before root colonization, which are spore
germination, hyphal growth, and host recognition and appressorium formation. My
spores are restings structures and I only germinate under suitable temperature, carbon
dioxide concentration, pH and phosphorus concentration. My hyphae only grow long
under low phosphorus conditions.
In my hyphae there is a high surface to volume ratio, plus my roots are finer, so
more nutrients can enter and be absorbed then roots. I form an obligate symbionts
relationship between plants, and I can not survive with out an carbon food source from
the plants. The more carbon supplied to me, the more nutrients I supply to the plant, on
the other hand, sometimes I am not a good symbiotic and provide little or no
phosphorous, and take in a lot of carbon source.