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Mycorrhizosphere: Strategies and Functions 221<br />

Table 2. Compounds released by plant roots in the process of rhizodeposition<br />

Compound Exudate components<br />

Sugars Glucose, fructose, sucrose, maltose, galactose, rhamnose, ribose,<br />

xylose, arabinose, raffinose, oligosaccharide<br />

Amino compounds Asparagine, α-alanine, glutamine, aspartic acid, leucine/isoleucine,<br />

serine, γ-aminobutyric acid, glycine, cystine/cysteine, methionine,<br />

phenylalanine, tyrosine, threonine, lysine, proline, tryptophane,<br />

β-alanine, arginine, homoserine, cystathionine<br />

Organic acids Tartaric, oxalic, citric, malic, proponic, butyric, succinic, fumaric,<br />

glycolic, valeric, malonic<br />

Fatty acids and<br />

sterols<br />

Palmitic, stearic, oleic, linoleic, linolenic acids, cholestrol,<br />

campesterol, stigmasterol, sitosterol<br />

Growth factors Biotin, thiamine, niacin, pantothenate, choline, inositol, pyridoxine,<br />

ρ-aminobenzoic acid, N-methyl nicotinic acid<br />

Nucleotides,<br />

flavonines and<br />

enzymes<br />

Miscellaneous<br />

compounds<br />

Flavonine, adenine, guanine, uridine/cytidine, phosphatase,<br />

invertase, amylase, protease, polygalacturonase<br />

Auxins, scopoletin, fluorescent substances, hydrocyanic acid,<br />

glycosides, saponin (glucosides), organic phosphorus compounds,<br />

nematode-cyst or egg-hatching factors, nematode attractants, fungal<br />

mycelium growth stimulants and inhibitors, zoospore attractants<br />

Fig. 5. Root hairs that assist the<br />

plant in exploring resources<br />

present in soils

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