Index >> Rhizosphere and Phyllosphere >> Organic Compounds Detected in Plant Root Exudates

Class of organic compound

Exudate components

Sugars

Glucose, fructose, sucrose, maltose, galactose, rhamnose, ribose, xylose, arabinose, raffinose, oligosaccharide

Amino compounds

Asparagine, a-alanine, glutamine, aspartic acid, leucine/isoleucine, serine, aminobutyric acid, glycine, cysteine/cystine, methionine, phenylalanine, tyrosine, threonine, lysine, proline, tryptophan, b-alanine, arginine, homoserine, cystathionine

Organic acids

Tartaric, oxalic, citric, malic, acetic, propionic, butyric, succinic, fumaric, glycolic, valeric, malonic

Fatty acids and sterols

Palmitic, stearic, oleic, linoleic, and linolenic acids; cholesterol, campesterol, stigmasterol, sitosterol

Growth factors

Biotin, thiamine, niacin, pantothenate, choline, inositol, pyridoxine, p-amino benzoic acid, n-methyl nicotinic acid

Nucleotides, favonones, and enzymes

Flavonone; adenine, guanine, uridine/cytidine; phosphatase, invertase, amylase, proteinase, polygalacturonase

Miscellaneous

Auxins, scopoletin, fluorescent substances, hydrocyanic acid, glycosides, saponin (glucosides), organic phosphorus compounds, nematode cyst or egg-hatching factors, nematode attractants, fungal mycelial growth stimulants, mycelium growth inhibitors, zoospore attractants, spore, and sclerotium germination stimulants and inhibitors, bacterial stimulants and inhibitors, parasitic weed germination stimulators