Table 2 Name, type, and function of root exudate compounds linked to drought severity treatment and to the separation of treatments A (control), B (mild), and C (severe) at T2 (after treatment).
From: Root exudate composition reflects drought severity gradient in blue grama (Bouteloua gracilis)
Name | Type | Function | References |
|---|---|---|---|
Adipic acid, fumaric acid, butryic acid, 3-hydroxy-3-methylglutaric acid (dicrotalic acid, aconitic acid, caprylic acid, malonic acid | Carboxylic acid | Common in root exudates and serve as microbial nutrients | |
Aminopropionitrile | Organic compound | Rare compound observed in root exudates | |
Benzoic acid | Carboxylic acid | Observed in root exudates and has exhibied antifungal and allelopathic properties | |
Guanidinobutyric acid | Betaine | N compounds common in root exudates and ubiquitous in plants for their protective action in response to abiotic stress | |
Hexadecanol | Alcohol | Observed in root exudates of tall fescue and varied with tall fescue cultivar and endophyte presence | |
Myo-inositol | Sugar | Involved in signalling, sugar metabolism, and abiotic stress tolerance | |
Proline, serine, L-isoleucine, threonine, glutamic acid, valine | Amino acid | Serves as microbial chemoreceptors and may be a form of communication with microbes or a response to the presence of microbes, contributes to chemical defense against abiotic stressors (e.g. drought, cold, salt) | |
Sucrose, mannose, arabinose, glucose, galactose | Sugar | C sources for microbes, stimulate microbial activity, release in root exudates increased under drought | |
Tagatose | Sugar | Can inhibit the growth of some plant pathogens |
