Exometabolites of bread wheat and tomato affecting the plant-microbe interactions in the rhizosphere

Кравченко, Л В; Shapozhnikov, A. I.; Макарова, Н. М.; Azarova, T. S.; L’vova, K. A.; Kostyuk, I. I.; Lyapunova, O. A.; Тихонович, И. А.

doi:10.1134/s1021443711050128

Cited by 14 publications

(8 citation statements)

References 13 publications

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“…The presence of tryptophan in root exudates is an important trait for successful establishment of interactions between plants and auxin-producing PGPR (Kravchenko et al, 2004(Kravchenko et al, , 2011Kamilova et al, 2006). As rhizobacteria-induced decreases in rhizosphere tryptophan concentrations were significant only after inoculation of cv.…”

Section: Discussionmentioning

confidence: 99%

Rhizobacteria that produce auxins and contain 1‐amino‐cyclopropane‐1‐carboxylic acid deaminase decrease amino acid concentrations in the rhizosphere and improve growth and yield of well‐watered and water‐limited potato (Solanum tuberosum)

Белимов

Dodd

Safronova

et al. 2015

Annals of Applied Biology

134

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Plant-growth-promoting rhizobacteria (PGPR) utilise amino acids exuded from plant root systems, but hitherto there have been no direct measurements of rhizosphere concentrations of the amino acid 1-amino-cyclopropane-1-carboxylic acid (ACC) following inoculation with PGPR containing the enzyme ACC deaminase. When introduced to the rhizosphere of two potato (Solanum tuberosum) cultivars (cv. Swift and cv. Nevsky), various ACC deaminase containing rhizobacteria (Achromobacter xylosoxidans Cm4, Pseudomonas oryzihabitans Ep4 and Variovorax paradoxus 5C-2) not only decreased rhizosphere ACC concentrations but also decreased concentrations of several proteinogenic amino acids (glutamic acid, histidine, isoleucine, leucine, phenylalanine, serine, threonine, tryptophan, tyrosine, valine). These effects were not always correlated with the ability of the bacteria to metabolise these compounds in vitro, suggesting bacterial mediation of root amino acid exudation. All rhizobacteria showed similar root colonisation following inoculation of sand cultures, thus species differences in amino acid utilisation profiles apparently did not confer any selective advantage in the potato rhizosphere. Rhizobacterial inoculation increased root biomass (by up to 50%) and tuber yield (by up to 40%) in pot trials, and tuber yield (by up to 27%) in field experiments, especially when plants were grown under water-limited conditions. Nevertheless, inoculated and control plants showed similar leaf water relations, indicating that alternative mechanisms (regulation of phytohormone balance) were responsible for growth promotion. Rhizobacteria generally increased tuber number more than individual tuber weight, suggesting that accelerated vegetative development was responsible for increased yield.

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Section: Discussionmentioning

confidence: 99%

Rhizobacteria that produce auxins and contain 1‐amino‐cyclopropane‐1‐carboxylic acid deaminase decrease amino acid concentrations in the rhizosphere and improve growth and yield of well‐watered and water‐limited potato (Solanum tuberosum)

Белимов

Dodd

Safronova

et al. 2015

Annals of Applied Biology

134

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“…Although the cultivar of tomato used in this study, Yegwang was different from those in other studies, the tryptophan concentration in the tomato root exudates seems to be quite high. IAA was not detected from the tomato root exudates (data not shown) and similar studies also showed the production of various organic acids sugars and other metabolites but IAA (Kamilova et al, 2006;Kravchenko et al, 2011;Ahemad and Kilbret, 2014).…”

Section: Resultsmentioning

confidence: 65%

“…2), and this kind of bacterial growth may occur in the real plant rhizosphere. Kamilova et al (2006) and Kravchenko et al (2011) also detected various organic acids, carbohydrates and amino acids from tomato root exudate, which were utilized for the growth of some rhizobacteria. Lambrecht et al (2000) suggested that the plant growth may be promoted by IAA produced by PGPR which growth can be helped by organic compounds secreted by plants, and our study supports this model.…”

Section: Resultsmentioning

confidence: 99%

“…2) in a sterile Petri dish placed in a plant growth chamber (28℃, 6,000 lux for 14 h and 23℃, dark conditions for 10 h) for 3 days. Tomato root exudates were extracted with 25 ml distilled water from the filter paper, concentrated at 45℃ in a rotary vacuum evaporator (final volume 0.5 ml), and tryptophan was analyzed by HPLC (Kravchenko et al, 2011).…”

Section: Pot Test For Growth Promotion Of Tomato Plant By Acinetobactmentioning

confidence: 99%

“…Recently it was reported that various compounds including tryptophan secreted in plant root exudates may affect the plant-microbe interactions in the rhizosphere (Kamilova et al, 2006;Kravchenko et al, 2011), and there have been many reports on IAA synthetic pathways and effects of secreted IAA from rhizobacteria on plant growth (Ahemad and Kibret, 2014). However, the rhizobacterial growth and IAA production in the secreted root exudates and subsequent its growth promotion of plant have not been reported yet.…”

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confidence: 99%

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