Organic acids in the root exudates of diplachne fusca (linn.) beauv.

Kloss, M.; Iwannek, K. H.; Fendrik, I.; Niemann, E.

doi:10.1016/0098-8472(84)90020-0

Cited by 30 publications

(14 citation statements)

References 15 publications

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“…Oxalate is used for charge compensation in nitrate reduction, and in the precipitation of excess solutes such as calcium oxalate. Kloss et al (1984) noted that oxalic acid has been detected in the root exudates of C‐3 plants, but not C‐4 plants.…”

Section: Discussionmentioning

confidence: 99%

Changes in Crested Wheatgrass Root Exudation Caused by Flood, Drought, and Nutrient Stress

et al. 2007

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Root exudates can chelate inorganic soil contaminants, change rhizosphere pH, and may increase degradation of organic contaminants by microbial cometabolism. Root‐zone stress may increase exudation and enhance phytoremediation. We studied the effects of low K+, high NH4+/NO3− ratio, drought, and flooding on the quantity and composition of exudates. Crested wheatgrass (Agropyron cristatum) was grown in Ottawa sand in sealed, flow‐through glass columns under axenic conditions for 70 d. Root exudates were collected and analyzed for total organic carbon (TOC) and organic acid content to compare treatment effects. Plants in the low K+ treatment exuded 60% more TOC per plant per day (p = 0.01) than the unstressed control. Drought stress increased cumulative TOC exuded per gram dry plant by 71% (p = 0.05). The flooded treatment increased TOC exuded per gram dry plant by 45%, although this was not statistically significant based on the two replicate plants in this treatment. Exudation from the high NH4+/NO3− ratio treatment was 10% less than the control. Exudation rates in this study ranged from 8 to 50% of rates in four other published studies. Gas chromatography‐mass spectrometry (GC–MS) analysis indicated that malic acid was the predominant organic acid exuded. Fumaric, malonic, succinic, and oxalic acids were also detected in the exudates of all treatments. These results demonstrate that nutrient and water stress have significant effects on the quantity and composition of root exudates. Cultural manipulations to induce stress may change the quantity of root exudates and thus increase the effectiveness of phytoremediation.

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Section: Discussionmentioning

confidence: 99%

Changes in Crested Wheatgrass Root Exudation Caused by Flood, Drought, and Nutrient Stress

et al. 2007

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“…Major organic compounds that are present in root exudates of grasses and cereals (11,23,29) were tested as chemoeffectors. Three methods, swarm plates, a miniplug assay, and a temporal gradient assay, were used to test the efficiency of a chemical as a chemoeffector for A. brasilense.…”

Section: Resultsmentioning

confidence: 99%

“…A. brasilense utilizes fructose via the Entner-Doudoroff pathway and possesses a complete tricarboxylic acid (TCA) cycle; it lacks a catabolic Embden-Meyerhof-Parnas pathway and a hexose monophosphate pathway (14,26) and grows poorly on amino acids as sole carbon and energy sources (19). Roots of grasses and cereals exude significant amounts of organic acids (mainly those of the TCA cycle), sugars, and amino acids that are major organic compounds in the rhizosphere (11,23,29). Motility and chemotaxis are thought to be important factors for efficient plant colonization by the bacteria (47).…”

mentioning

confidence: 99%

Energy Taxis Is the Dominant Behavior in Azospirillum brasilense

2000

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Energy taxis encompasses aerotaxis, phototaxis, redox taxis, taxis to alternative electron acceptors, and chemotaxis to oxidizable substrates. The signal for this type of behavior is originated within the electron transport system. Energy taxis was demonstrated, as a part of an overall behavior, in several microbial species, but it did not appear as the dominant determinant in any of them. In this study, we show that most behavioral responses proceed through this mechanism in the alpha-proteobacterium Azospirillum brasilense. First, chemotaxis to most chemoeffectors typical of the azospirilla habitat was found to be metabolism dependent and required a functional electron transport system. Second, other energy-related responses, such as aerotaxis, redox taxis, and taxis to alternative electron acceptors, were found in A. brasilense. Finally, a mutant lacking a cytochrome c oxidase of the cbb 3 type was affected in chemotaxis, redox taxis, and aerotaxis. Altogether, the results indicate that behavioral responses to most stimuli in A. brasilense are triggered by changes in the electron transport system.

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“…A. lipoferum Sp T60, isolated from wheat roots, is strongly attracted to fructose, aspartate, citrate, and oxalate, the latter being the major organic acid in exudates of wheat [207]. A. lipoferum ER15, isolated from Leptochloafusca (kallar grass), is most strongly attracted by malate, the major organic acid exuded by L. fusca [109]. High molecular weight exudates isolated from L. fusca also attract A. lipoferum ER15 [174].…”

Section: Attraction Toward Rootsmentioning

confidence: 99%

Surface properties and motility of rhizobium and azospirillum in relation to plant root attachment

Troch

Vanderleyden

1996

Microb Ecol

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Plant growth promotion by rhizobacteria is a widely spread phenomenon. However only a few rhizobacteria have been studied thoroughly.Rhizobium is the best-studied rhizobacterium. It forms a symbiosis with a restricted host range. Azospirillum is another plant-growth-promoting rhizobacterium which forms rhizocoenoses with a wide range of plants. In both bacteria, the interaction with the plant involves the attraction toward the host plant and the attachment to the surface of the root. Both bacteria are attracted to plant roots, but differ in specificity. Attachment to plant roots occurs in two steps for both bacteria: a quick, reversible adsorption, and a slow, irreversible anchoring to the plant root surface. However, for the two systems under study, the bacterial surface molecules involved in plant root attachment are not necessarily the same.

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Organic acids in the root exudates of diplachne fusca (linn.) beauv.

Cited by 30 publications

References 15 publications

Changes in Crested Wheatgrass Root Exudation Caused by Flood, Drought, and Nutrient Stress

Changes in Crested Wheatgrass Root Exudation Caused by Flood, Drought, and Nutrient Stress

Energy Taxis Is the Dominant Behavior in Azospirillum brasilense

Surface properties and motility of rhizobium and azospirillum in relation to plant root attachment

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