Interrelations between Azospirillum and Rhizobium nitrogen-fixers and arbuscular mycorrhizal fungi in the rhizosphere of alfalfa in sterile, AMF-free or normal soil conditions

Bíró, Borbála; Köves-Péchy, K.; Vörös, I.; Takács, Tünde; Eggenberger, Peter Heinrich; Strasser, Reto J.

doi:10.1016/s0929-1393(00)00092-5

Cited by 112 publications

(55 citation statements)

References 26 publications

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“…Crops sometimes benefit from indigenous or introduced symbionts with little correlation to the degree of root colonization (Al-Raddad 1991). Contrasting to a study with alfalfa by Biró et al (2000), we did not find that inoculation with an AMF strain was more supportive on N, P and K uptake if indigenous AMF were excluded.…”

Section: Discussioncontrasting

confidence: 99%

“…Many studies demonstrated beneficial effects of indigenous and inoculated AMF on legumes (Habte andAziz 1985, Chalk et al 2006). We observed no effect of soil sterilization on the growth enhancement due to AMF inoculation (Farzaneh et al 2009), but other studies indicated that AMF inoculation increased dry matter accumulation and nutrient uptake compared with indigenous AMF communities (Biró et al 2000).…”

contrasting

confidence: 71%

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Arbuscular mycorrhiza enhances nutrient uptake in chickpea

Farzaneh¹,

Vierheilig²,

Lössl³

et al. 2011

PLANT SOIL ENVIRON

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Arbuscular mycorrhiza fungi (AMF) colonize roots of host plants and promote plant growth due to improved uptake of nutrients. While the effects on P uptake are well known, the relevance of AMF for the uptake of other nutrients is less investigated. In the present paper we studied contents of N, P, K, Ca, Mg, Fe, Mn, Cu, and Zn in the legume chickpea in pot experiments during two seasons. Beside the control, the following treatment combinations: (i) the inoculation with the commercial AMF product 'Symbivit ® '; (ii) soil sterilization before inoculation, and (iii) mineral nitrogen application. A moderate level of AMF colonization (18-55% of roots), enhanced the nutrient uptake of chickpea. With P, Mn, and in 2006 also with K, Cu, and Fe the nutrient concentrations were also elevated, even along with a simultaneous increase in plant biomass. Soil sterilization or fertilization with N showed no significant effect on nutrient uptake and biomass production.

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Section: Discussioncontrasting

confidence: 99%

contrasting

confidence: 71%

Arbuscular mycorrhiza enhances nutrient uptake in chickpea

Farzaneh¹,

Vierheilig²,

Lössl³

et al. 2011

PLANT SOIL ENVIRON

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“…This observation concurs with several earlier studies, that have reported positive interactions between AMF and a wide range of PGPR, including phosphate-dissolving bacteria (Toro et al, 1997), nodule-forming N 2 -fixing Rhizobia, free-living Azospirillum spp. Biro et al, 2000) and Pseudomonas spp. (Vàzquez et al, 2000), in their effect on plant growth.…”

Section: Discussionmentioning

confidence: 99%

Plant growth stage, fertiliser management and bio-inoculation of arbuscular mycorrhizal fungi and plant growth promoting rhizobacteria affect the rhizobacterial community structure in rain-fed wheat fields

Roesti

Gaur

Johri

et al. 2006

Soil Biology and Biochemistry

192

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The goal of this study was first to assess the dynamics of the bacterial community during a growing season in three Indian rain-fed wheat fields which differ mainly through their fertilizer management and yield and then to study the effects of PGPR/AMF bio-inoculations on the bacterial community structure and wheat growth. The bacterial community structure of the rhizosphere soil (RS) and the rhizoplane/endorhizosphere (RE) was determined by PCR-denaturing gradient gel electrophoresis. Seed treatments consisted of consortia of two PGPR strains alone or combined with AMF or AMF alone. The PGPR strains were Pseudomonas spp. which included some or all of the following plant growth promoting properties: phosphate solubilisation and production of indole-3-acetic acid, siderophores, 1-aminocyclopropane-1-carboxylate deaminase and diacetyl-phloroglucinol. The mycorrhizal inoculum was an indigenous AMF consortium isolated from the field with the lowest level of fertilization and yield. Variation partitioning analysis of the DGGE data indicated a predominant effect of the wheat growth stage (30.4% of the variance, PZ0.001) over the type of field (9.0%, PZ0.027) on the bacterial community structure in the RE. The impact of plant age in the RS was less than in the RE and the bacterial community structure of the field with the highest input of fertilization was very different from the low input fields. The bio-inoculants induced a significant modification in the bacterial community structure. In the RS, the bacterial consortia explained 28.3% (PZ0.001) and the presence of AMF 10.6% (PZ0.02) of the variance and the same trend was observed in the RE. Plant yield or grain quality was either increased or remained unaffected. For example, protein content was significantly higher in the treated plants' grain compared to the control plants; maximum values were obtained when the PGPR were co-inoculated with the AMF. The percentage of root colonization by AMF was significantly higher in the treatments containing a mycorrhizal inoculum than in the untreated control and remained unaffected by the PGPR treatments. In conclusion, the wheat rhizobacterial community structure is highly dynamic and influenced by different factors such as the plant's age, the fertilizer input and the type of bio-inoculant. In addition, there is a distance-related effect of the root on the bacterial community. Finally, a combined bio-inoculation of diacetyl-phloroglucinol producing PGPR strains and AMF can synergistically improve the nutritional quality of the grain without negatively affecting mycorrhizal growth.

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“…were used. Biró et al (2000) have shown synergistic interactions between A. brasilense Km5, an isolate of Rhizobium meliloti and G. fasciculatum M 107, on alfalfa (Medicago sativa L.) root and shoot production and on shoot N content. This response was seen in gamma-irradiated soil where AMF were re-introduced or not, but not in non-sterilized soil where a seemingly competitive indigenous microflora was present.…”

Section: Influence On N 2 Fixationmentioning

confidence: 99%

Impact of arbuscular mycorrhizal fungi on N and P cycling in the root zone

Hamel¹

2004

Can. J. Soil. Sci.

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Hamel, C. 2004. Impact of arbuscular mycorrhizal fungi on N and P cycling in the root zone. Can. J. Soil Sci. 84: 383-395. The influence of arbuscular mycorrhizal fungi (AMF) on soil processes is difficult to define, in part because it varies with the plant and fungal genotypes as well as with environmental conditions. The influence of AMF on N cycling is just being discovered. This short review examines areas of knowledge related to the nature of the mycorrhizosphere, AMF-microbe interactions, and N and P mobilization in the root zone. The role AMF could play in the root zone in N and P dynamics is presented. The spatial organization of roots and hyphae in soil suggests that AMF may enhance the reabsorption of nutrients lost through root exudation. These fungi influence soil microorganisms and, hence, they may influence biochemical reactions in soil including mineralization of organic matter and nitrification. AMF seem to improve the capacity of their host plant to use organic sources of P and N. AMF might improve the ability of plants to compete with saprotrophs for the uptake of P and N. The impact from this latter effect of AMF could exceed that stemming from their possible direct use of amino-acid-N, their production of phosphatase enzymes and possibly of organic anions. Better competitive ability of mycorrhizal plants under conditions of low soil P and N levels could reduce saprotrophic populations and, if this occurs, regulate soil organic matter turnover rate. The management of biological soil resources, in truly sustainable cropping systems, may be the largest challenge in crop production. Il est difficile d'établir avec précision l'incidence des mycorhizes à arbuscules (MA) sur les processus du sol, parce qu'elle varie, d'une part, avec la plante et le génotype des champignons, mais aussi avec les conditions environnementales. On commence à peine à décou-vrir l'influence des MA sur le cycle de l'azote. Ce court article fait le point sur ce qu'on sait de la nature de la myco-rhizosphère, des interactions entre les MA et les microorganismes et de la mobilisation du N et du P dans la rhizosphère. Suit une description du rôle que les MA pourraient jouer dans la dynamique du N et du P au niveau de la rhizosphère. L'organisation spatiale des racines et des hyphes dans le sol laisse croire que les MA pourraient faciliter la réabsorption des éléments nutritifs que les racines perdent par exsudation. Les champignons influent sur la microflore tellurique, donc pourraient modifier les réactions biochimiques dans le sol, y compris la minéral-isation et la nitrification de la matière organique. Les MA semblent accroître la capacité de la plante hôte à exploiter les sources de P et de N organiques. Ils pourraient aussi amener les plantes à mieux concurrencer les saprophytes pour l'absorption du P et du N. Cette dernière propriété pourrait avoir une plus grande incidence que celle issue de l'utilisation directe éventuelle du N des acides aminés, de la synthèse de phosphatase et peut-être de la libération d'anions or...

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Interrelations between Azospirillum and Rhizobium nitrogen-fixers and arbuscular mycorrhizal fungi in the rhizosphere of alfalfa in sterile, AMF-free or normal soil conditions

Cited by 112 publications

References 26 publications

Arbuscular mycorrhiza enhances nutrient uptake in chickpea

Arbuscular mycorrhiza enhances nutrient uptake in chickpea

Plant growth stage, fertiliser management and bio-inoculation of arbuscular mycorrhizal fungi and plant growth promoting rhizobacteria affect the rhizobacterial community structure in rain-fed wheat fields

Impact of arbuscular mycorrhizal fungi on N and P cycling in the root zone

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