Increased acidification in the rhizosphere of cactus seedlings induced by Azospirillum brasilense

Carrillo, Angel; Li, Ching Y.; Bashan, Yoav

doi:10.1007/s00114-002-0347-6

Cited by 81 publications

(45 citation statements)

References 18 publications

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“…The most efficient isolates generated a decrease in the pH of the microplate solution from 6.5 to 3.2 in 48 h. It should be kept in mind that production of protons is one of the main factors influencing mineral stability (43). Moreover, Carrillo et al (12) demonstrated that inoculation of cardon seedlings with a strain of Azospirillum brasilense enhanced acidification of the rhizosphere as well as plant growth in poor desert soil microcosms. About two-thirds of the bacterial isolates were also able to release iron from biotite (Fig.…”

Section: Resultsmentioning

confidence: 99%

Influence of Forest Trees on the Distribution of Mineral Weathering-Associated Bacterial Communities of the Scleroderma citrinum Mycorrhizosphere

Calvaruso¹,

Turpault²,

Leclerc

et al. 2010

Appl Environ Microbiol

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In acidic forest soils, availability of inorganic nutrients is a tree-growth-limiting factor. A hypothesis to explain sustainable forest development proposes that tree roots select soil microbes involved in central biogeochemical processes, such as mineral weathering, that may contribute to nutrient mobilization and tree nutrition. Here we showed, by combining soil analyses with cultivation-dependent analyses of the culturable bacterial communities associated with the widespread mycorrhizal fungus Scleroderma citrinum, a significant enrichment of bacterial isolates with efficient mineral weathering potentials around the oak and beech mycorrhizal roots compared to bulk soil. Such a difference did not exist in the rhizosphere of Norway spruce. The mineral weathering ability of the bacterial isolates was assessed using a microplaque assay that measures the pH and the amount of iron released from biotite. Using this microplate assay, we demonstrated that the bacterial isolates harboring the most efficient mineral weathering potential belonged to the Burkholderia genus. Notably, previous work revealed that oak and beech harbored very similar pHs in the 5-to 10-cm horizon in both rhizosphere and bulk soil environments. In the spruce rhizosphere, in contrast, the pH was significantly lower than that in bulk soil. Because the production of protons is one of the main mechanisms responsible for mineral weathering, our results suggest that certain tree species have developed indirect strategies for mineral weathering in nutrient-poor soils, which lie in the selection of bacterial communities with efficient mineral weathering potentials.

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Section: Resultsmentioning

confidence: 99%

Influence of Forest Trees on the Distribution of Mineral Weathering-Associated Bacterial Communities of the Scleroderma citrinum Mycorrhizosphere

Calvaruso¹,

Turpault²,

Leclerc

et al. 2010

Appl Environ Microbiol

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“…One mechanism by which phosphate can be released from the tricalcium complex is by decreasing the pH of the surrounding medium through the secretion of organic acids (Carrillo et al, 2002).…”

Section: Organic Acid Productionmentioning

confidence: 99%

Isolation of efficient phosphate solubilizing bacteria capable of enhancing tomato plant growth

Sharon

Hathwaik

Glenn

et al. 2016

J. Soil Sci. Plant Nutr.

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Phosphorus is one of the three macronutrients that are essential for plant growth and development. Inorganic phosphorus (P), which can make up to 70% of the total P content in soils, can exist in calcium-, aluminum-, or iron-complexed forms that are unavailable for plant use. As a result, mineral phosphorus, P 2 O 5 , is often used as a fertilizer to supplement the nutrient for crop growth. To reduce the addition of mineral phosphorus to agricultural soils, research in naturally occurring phosphate-solubilizing microorganisms has been conducted for decades. This study found bacteria that solubilized phosphate at very high rates. The most efficient of the bacteria presented in this paper, Pantoea sp. Pot1, can solubilize tricalcium phosphate (Ca 3 (PO 4 ) 2 ) at a rate of 956 mg L -1 . This bacteria produces a variety of organic acids, including acetic, gluconic, formic, and propionic acids. Greenhouse experiments demonstrated that tomato plants with soil systems inoculated with Pantoea sp. Pot1 incorporated more P and produced much higher biomass weights than those plants without any added bacteria.

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“…However, rhizosphere acidifi cation could be obtained by indirect mechanisms. Inoculation with A. brasilense Cd increased rhizosphere acidifi cation, and it was suggested that auxins produced by the Azospirillum PGPR may stimulate the plasma membrane H-ATPase, thereby leading to the transport of protons across the cell wall (Carrillo et al 2002 ). Lastly, A. brasilense may increase root iron absorption by releasing bacterial siderophores that can be recognized by plant iron receptors and used to enhance iron content in plant (Barton et al 1986 ).…”

Section: Against Abiotic Stressesmentioning

confidence: 99%

Alleviation of Abiotic and Biotic Stresses in Plants by Azospirillum

Vacheron

Renoud

Müller

et al. 2015

Handbook for Azospirillum

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In the face of global changes, plants must adapt to a wide range and often combined biotic and abiotic stresses that seriously impaired plant growth and development. Plants develop complex strategies to deal with water stress conditions, soil fertility losses, soil pollutions, pests, and disease. Emerging evidence suggest the involvement of common hormonal players in plant defense signaling pathways triggered in response to biotic and abiotic stresses. Besides plant strategies, plant growth-promoting rhizobacteria (PGPR), which colonize the root system and establish cooperative interactions with plants can improve their growth and help them to adapt to and cope with multiple stresses including drought, salinity, heavy metal pollutions, and parasites. Accordingly, PGPR supply added values to the plant defense strategies by expressing many relevant functions for modulating the plant hormonal balance, increasing nutrients supply to the plant, improving the functional and phy sical properties of protective barriers against plant parasites. Among PGPR, Azospirillum strains were long viewed as biofertilizers and less as biocontrol agents. It is becoming evident that Azospirillum is able to protect plants against a myriad of detrimental conditions. This review provides an update of works regarding the ability of Azospirillum strains to alleviate plant stress and brings out the relevant involved plant-benefi cial functions. Developing PGPR-based bio-inoculants is a promising strategy to improve the growth and health of crops and develop sustainable agriculture.

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Increased acidification in the rhizosphere of cactus seedlings induced by Azospirillum brasilense

Cited by 81 publications

References 18 publications

Influence of Forest Trees on the Distribution of Mineral Weathering-Associated Bacterial Communities of the Scleroderma citrinum Mycorrhizosphere

Influence of Forest Trees on the Distribution of Mineral Weathering-Associated Bacterial Communities of the Scleroderma citrinum Mycorrhizosphere

Isolation of efficient phosphate solubilizing bacteria capable of enhancing tomato plant growth

Alleviation of Abiotic and Biotic Stresses in Plants by Azospirillum

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