vesicular arbuscular mycorrhizae mohammad reza amerian april 2000
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Vesicular Arbuscular Mycorrhizae
Mohammad Reza AmerianMohammad Reza AmerianApril 2000
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Introduction
Mycorrhizae are mutualistic associations or symbiosis between soil fungi and plant roots that colonise the cortical tissue of roots .
The host plant receives mineral nutrients and water while the fungus obtains photosynthetically derived carbon compounds.
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Type of mycorrhizae Type of mycorrhizae and Taxonomyand Taxonomy
GLOMALES (ORDER)
GIGASPORINAE
Gigasporaceae
Gigaspora
Scutellospora
GLOMINEAE
Glomaceae
Glomus
Sclerocystis
Acaulosporaceae
Acaulospora
Entrophospora
Vesicular Arbuscular mycorrhizae (VAM or AM)Ectomycorrhizae (ECM)Ect-endo mycorrhizaeOrchid mycorrhizaeEricoid mycorrhizae
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Arbuscules Arbuscules are formed by
repeated dichotomous branching and reductions in hyphal width.
Arbuscules start to form approximately 2 days after root penetration.
Arbuscules are considered the major site of exchange between the fungus and host.
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Vesicles
Accumulate storage product
Intercellular Intracellular Function as
propagules
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External Hyphae Type thick "runner" or
they are different "distributive" hyphae as well as thin "absorptive" hyphae
Responsible for nutrient acquisition
Propagation of the association
Spore formation
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Global perspective on mycorrhizae
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Benefits Ascribed to Mycorrhiza
Improved nutrient uptake Increase tolerance of
Drought
Salts
Heavy metals
Pathogens Enhanced soil stabilisation