Root exudates of plants

Vančura, V.; Hanzlíková, A.

doi:10.1007/bf01373482

Cited by 77 publications

(16 citation statements)

References 14 publications

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“…The results suggest, therefore, that on average the cells were more active in the rhizosphere than in the bulk soil. This may reflect that P. fluorescens strains are able to exploit a number of simple carbon sources present in exudates (39). In contrast, the cellular activity of a Flavobacterium strain, a poor competitor for root exudates, that was isolated from bulk soil was lower in the rhizosphere than in the bulk soil (12,31).…”

Section: Fig 1 (A)mentioning

confidence: 98%

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Distribution of metabolic activity and phosphate starvation response of lux-tagged Pseudomonas fluorescens reporter bacteria in the barley rhizosphere

Kragelund¹,

Hosbond²,

Nybroe³

1997

Appl Environ Microbiol

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The purpose of this study was to determine the metabolic activity of Pseudomonas fluorescens DF57 in the barley rhizosphere and to assess whether sufficient phosphate was available to the bacterium. Hence, two DF57 reporter strains carrying chromosomal luxAB gene fusions were introduced into the rhizosphere. Strain DF57-40E7 expressed luxAB constitutively, making bioluminescence dependent upon the metabolic activity of the cells under defined assay conditions. The DF57-P2 reporter strain responded to phosphate limitation, and the luxAB gene fusion was controlled by a promoter containing regulatory sequences characteristic of members of the phosphate (Pho) regulon. DF57 generally had higher metabolic activity in a gnotobiotic rhizosphere than in the corresponding bulk soil. Within the rhizosphere the distribution of metabolic activity along the root differed between the rhizosphere soil and the rhizoplane, suggesting that growth conditions may differ between these two habitats. The DF57-P2 reporter strain encountered phosphate limitation in a gnotobiotic rhizosphere but not in a natural rhizosphere. This difference in phosphate availability seemed to be due to the indigenous microbial population, as DF57-P2 did not report phosphate limitation when established in the rhizosphere of plants in sterilized soil amended with indigenous microorganisms.

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Section: Fig 1 (A)mentioning

confidence: 98%

“…The rhizosphere environment is influenced by the input of organic material from the plant. A barley plant exudes from its roots 0.4 to 0.5 mg of organic substances into its surroundings during its first 10 days (39). The exudates consist mainly of low-molecular-weight carbon sources (including amino acids) readily available to microorganisms.…”

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confidence: 99%

Distribution of metabolic activity and phosphate starvation response of lux-tagged Pseudomonas fluorescens reporter bacteria in the barley rhizosphere

Kragelund¹,

Hosbond²,

Nybroe³

1997

Appl Environ Microbiol

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“…Root exudates are composed of low molecular compounds such as saccharides, organic acids, amino acids, phenols, high molecular polysaccharides and proteins. 27 The low molecular organic acids (e.g., succinic acid and malic acid) 8 and reducing substances such as phenols, 28 which are critical for the transformation of nCeO 2 , varied among different species. Moreover, different acids and reducing substances have different capacities to dissolve the nCeO 2 .…”

Section: Rootmentioning

confidence: 99%

Plant species-dependent transformation and translocation of ceria nanoparticles

Zhang

Xie

et al. 2019

Environ. Sci.: Nano

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“…Plants are known to exude a wide range of substances [18]. The ability of Enterobacter sp.-NCOO1927-MR5 to utilize a wide range of sugars, may contribute to the success of this species in adaptation to roots of different plants.…”

Section: Discussionmentioning

confidence: 99%

Some Characteristics of a Plant Growth Promoting <i>Enterobacter</i> sp. Isolated from the Roots of Maize

Ogbo¹,

Okonkwo²

2012

AiM

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Some properties of an Enterobacter sp. isolated from the roots of maize are described. Isolation was carried out using the semisolid enrichment culture technique and subsequent plating, both on nitrogen free biotin medium. Morphological, biochemical and phylogenetic characterization using the MicroSeq  16S rDNA technique were employed in identification of isolate, which was revealed to be closest matched at 99.4% with Enterobacter asburiae. The isolate possessed properties of plant growth promoting bacteria. Thus, it produced indole-3-acetic, plant polymer hydrolyzing enzymes, pectinase and cellulase as well as ammonia in vitro. The isolate grew well in the presence of both 3% NaCl and 10 µg of streptomycin. In plate bioassays, isolate promoted the germination of both maize and rice seeds as well as root and lateral root growth resulting in weight increases of seedlings over their controls. Experiments to quantify ability of isolate to promote plant growth was performed using hydroponics solutions and as appropriate, an inoculum of the isolate. Pot experiments were also employed. Results from these studies showed that isolate enhanced nitrogen accumulation and significantly (P < 0.05), improved the growth of maze seedlings over controls. Isolate has potential for utilizetion as inocula for sustainable production of cereals.

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Root exudates of plants

Cited by 77 publications

References 14 publications

Distribution of metabolic activity and phosphate starvation response of lux-tagged Pseudomonas fluorescens reporter bacteria in the barley rhizosphere

Distribution of metabolic activity and phosphate starvation response of lux-tagged Pseudomonas fluorescens reporter bacteria in the barley rhizosphere

Plant species-dependent transformation and translocation of ceria nanoparticles

Some Characteristics of a Plant Growth Promoting <i>Enterobacter</i> sp. Isolated from the Roots of Maize

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Root exudates of plants

Cited by 77 publications

References 14 publications

Distribution of metabolic activity and phosphate starvation response of lux-tagged Pseudomonas fluorescens reporter bacteria in the barley rhizosphere

Distribution of metabolic activity and phosphate starvation response of lux-tagged Pseudomonas fluorescens reporter bacteria in the barley rhizosphere

Plant species-dependent transformation and translocation of ceria nanoparticles

Some Characteristics of a Plant Growth Promoting &lt;i&gt;Enterobacter&lt;/i&gt; sp. Isolated from the Roots of Maize

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Some Characteristics of a Plant Growth Promoting <i>Enterobacter</i> sp. Isolated from the Roots of Maize