Organic Compounds Released by Plant Roots

Sugars and Polysaccharides

Arabinose, desoxyribose, fructose, galactose, glucose, maltose, mannose, mucilages of various compositions, oligosaccharides, raffinose, rhamnose, ribose, sucrose, xylose.

Amino Acids

α-alanine, β-alanine, α−amino adipic, γ-amino butyric, arginine, asparagine, aspartic, citrulline, cystathionine, cysteine, cystine, deoxymugineic, 3-epihydroxymugineic, glutamine, glutamic, glycine, homoserine, histidine, isoleucine, leucine, lysine, methionine, mugineic, ornithine, phenylalanine, proline, serine, threonine, tryptophan, tyrosine, valine.

Organic Acids

Acetic, aconitic, aldonic, ascorbic, benzoic, butyric, caffeic, citric, p-coumaric, erythonic, ferulic, formic, fumaric, glutaric, glycolic, glyoxilic, lactic, malic, malonic, oxalacetic, oxalic, p-hydroxy benzoic, piscidic, propionic, pyruvic, succinic, syringic, tartaric, tetronic, valeric, vanillic.

Fatty Acids

Linoleic, linolenic, oleic, palmitic, stearic.

Sterols

Campesterol, cholesterol, sitosterol, stigmasterol

Growth Factors

p-amino benzoic acid, biotin, choline, n-methyl nicotinic acid, niacin, pantothenic, vitamins B1 (thiamine), B2(riboflavin), and B6(pyridoxine)

Enzymes

Amylase, invertase, peroxidase, phenolase, phosphatases, polygalacturonase, protease Flavonones and Nucleotides Adenine, flavonone, guanine, uridine or cytidine

Miscellaneous

Auxins, p-benzoquinone, scopoletin, hydrocyanic acid, 8-hydroxyquinoline, glucosides, hydroxamic acids, luteolin, unidentified ninhydrin-positive compounds, unidentified soluble proteins, reducing compounds, ethanol, glycinebetaine, inositol and myo-inositol-like compounds, Al-induced polypeptides, dihydroquinone, quercetin, quercitrin, sorgoleone.