Sergio de Faria

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• PhD
• Research Director at Brazilian Agricultural Research Corporation (EMBRAPA)

Neotropical Beta-rhizobia have a particular affinity to the large legume (Fabaceae) genus Mimosa and some of its relatives in the tribe Mimosae of the Caesalpinioideae subfamily. However, little is still known about the ecology of this interaction, especially the relationship between the rhizobia of "widespread" pan-tropical Mimosa species like M....

Neotropical Beta-rhizobia have a particular affinity to the large legume (Fabaceae) genus Mimosa and some of its relatives in the tribe Mimosae of the Caesalpinioideae subfamily. However, little is still known about the ecology of this interaction, especially the relationship between the rhizobia of Widespread pan-tropical Mimosa species like M. pu...

We assessed, in a field experiment, the effects of arbuscular mycorrhizal fungi (Rhizophagus intraradices) and plant growth-promoting bacteria (Azospirillum brasilense) on the soil biological activity and the growth of key pioneer species used in the revegetation of coal-mining areas undergoing recovery. We applied four inoculation treatments to th...

The objective of this study was to evaluate the potential of topsoil obtained from a natural forest fragment in the Brazilian Atlantic Forest to serve as a source of symbiotic microorganisms capable of promoting the growth of native tree species in ecological restoration projects. In greenhouse conditions, 14 experiments in a completely randomized...

Highlight: Chamaecrista has shrunk from trees to shrubs as it has radiated from the rainforest into drier habitats; this has been accompanied by the adoption of more intimately efficient nodulating symbioses. Abstract All non-mimosoid nodulated genera in the legume subfamily Caesalpinioideae confine their rhizobial symbionts within cell wall-bound...

All non-mimosoid nodulated genera in the legume subfamily Caesalpinioideae confine their rhizobial symbionts within cell wall-bound “fixation threads” (FTs). The exception is the large genus Chamaecrista in which shrubs and subshrubs house their rhizobial bacteroids more intimately within symbiosomes, whereas large trees have FTs. This study aimed...

All non-mimosoid nodulated genera in the legume subfamily Caesalpinioideae confine their rhizobial symbionts within cell wall-bound fixation threads (FTs). The exception is the large genus Chamaecrista in which shrubs and subshrubs house their rhizobial bacteroids more intimately within symbiosomes, whereas large trees have FTs. This study aimed to...

Atmospheric radiocarbon (¹⁴C) recorded in tree rings has been widely used for atmospheric ¹⁴C calibration purposes and climate studies. But atmospheric ¹⁴C records have been limited along tropical latitudes. Here we report a sequence from 1937 to 2007 of precisely measured ¹⁴C dates in tree rings of the parenchyma-rich Hymenolobium petraeum tree sp...

Nitrogen‐fixing symbiosis is globally important in ecosystem functioning and agriculture, yet the evolutionary history of nodulation remains the focus of considerable debate. Recent evidence suggesting a single origin of nodulation followed by massive parallel evolutionary losses raises questions about why a few lineages in the N2‐fixing clade reta...

Nitrogen-fixing symbiosis is globally important in ecosystem functioning and agriculture, yet the evolutionary history of nodulation remains the focus of considerable debate. Recent evidence suggesting a single origin of nodulation followed by massive parallel evolutionary losses raises questions about why a few lineages in the N 2 -fixing clade re...

Abstract The objective of this study was to evaluate the effect of the inoculation with nitrogen-fixing bacteria (NFB) and arbuscular mycorrhizal fungi (AMF) and substrates in the production of Samanea saman (rain tree) seedlings. Three substrates and three inoculation treatments were combined in a randomized block design with six repetitions. The...

The neotropical genus Calliandra is of great importance to ecology and agroforestry, but little is known about its nodulation or its rhizobia. The nodulation of several species from two restricted diversity centres with native/endemic species (Eastern Brazil and North-Central America) and species widespread in South America, as well as their nodule...

This study evaluated the initial growth and tolerance to water stress after planting Samanea saman seedlings produced with different substrates and inoculation patterns. The experiment used a factorial design (3 × 3), with three substrates: standard (67% subsoil + 33% cattle manure), a commercial substrate (composed mainly of peat), and treated sew...

Arbuscular mycorrhizal (AM) fungi constitute promising biofertilizers for the deployment of a sustainable agriculture. However, the evaluation of mycorrhizal benefits in the field is poorly documented, notably in fruit tree orchards, and concerns exclusively growth performance and nutrition. Here, we evaluated the persistence of beneficial effects...

Samanea saman (Jacq.) Merr is a tree species widely used in forest restoration plantations and its symbiosis with nitrogen-fixing bacteria (NFB) and arbuscular mycorrhizal fungi (AMF) can promote seedling formation and establishment and growth in the field. The growth of S. saman seedlings inoculated with nitrogen-fixing bacteria and arbuscular myc...

O trabalho objetivou acompanhar a colonização da comunidade da fauna edáfica, como indicador de qualidade de ambiente, após a revegetação de áreas alteradas pela atividade de mineração de bauxita, em Porto Trombetas, Pará. As amostragens foram realizadas nos anos 2000, 2002, 2003, 2004 e 2008 em plantios de diferentes idades, e com diferentes arran...

Fiscal modules (FMs) were created to facilitate the collection of the rural territorial tax in Brazil. In theory, the area of a FM should be enough for a family to have income, survive, and thrive. The current Native Vegetation Protection Law (Law 12.651/2012) gives equal treatment to all people who own up to four FMs through the Environmental Regu...

Mycorrhizal networks facilitate the colonization of legume roots by a symbiotic 5 nitrogen-fixing bacterium 6 7 Abstract 18 Arbuscular mycorrhizal fungi (AMF) absorb and translocate nutrients from soil to their host 19 plants by means of a wide network of extraradical mycelium (ERM). Here, we assessed whether 20 nitrogen fixing rhizobia can be tran...

Arbuscular mycorrhizal fungi (AMF) absorb and translocate nutrients from soil to their host plants by means of a wide network of extraradical mycelium (ERM). Here, we assessed whether nitrogen-fixing rhizobia can be transferred to the host legume Glycine max by ERM produced by Glomus formosanum isolate CNPAB020 colonizing the grass Urochloa decumbe...

Nitrogen (N) supply is one of the key factors for the success of forest plantations and the search for strategies that allow constant N inputs with reasonable cost is desirable. The ability to fix and accumulate large amounts of N confers adaptive characteristics to the legumes that excel over other species. Here we address the biological nitrogen...

The authors of the above-mentioned published article inadvertently omitted Dirk Redecker, Dioumacor Fall and Diaminatou Sanogo from the list of authors. The names and their affiliations presented in this paper.

The present study aimed to evaluate the effect of inoculation with nitrogen-fixing bacteria (NFB) and arbuscular mycorrhizal fungi (AMF) on the development of Tachigali vulgaris seedlings under nursery conditions. The seedlings were produced in 1 kg bags on a substrate of sand and vermiculite (1:1), following a completely randomized experimental de...

Mimosa caesalpiniifolia Benth. is a legume native to the semi-arid region of Brazil, in the Northeast. Its successful adaptation to other locations, such as the Atlantic Forest in the Southeast region, may be related to its ability to establish symbiosis with nitrogen-fixing bacteria, especially β-rhizobia of the genus Paraburkholderia. The objecti...

The extraradical mycelium (ERM) produced by arbuscular mycorrhizal fungi is fundamental for the maintenance of biological fertility in agricultural soils, representing an important inoculum source, together with spores and mycorrhizal root fragments. Its viability and structural traits, such as density, extent and interconnectedness, which are posi...

A wide program of fruit tree planting, notably jujube trees, has been implemented in the framework of the pan-African Great Green Wall (GGW) project to improve food security in arid and semiarid regions. However, the success of such initiatives is highly limited by a low tree growth and high tree mortality rates due to transplant shocks from tree n...

A wide program of fruit tree planting, notably jujube trees, has been implemented in the framework of the panAfrican Great Green Wall (GGW) project to improve food security in arid and semiarid regions. However, the success of such initiatives is highly limited by a low tree growth and high tree mortality rates due to transplant shocks from tree nu...

Arbuscular mycorrhizal fungi (AMF) play a major role as biofertilizer for sustainable agriculture. Nevertheless, it is still poorly documented whether inoculated AMF can successfully establish in field soils as exotic AMF and improve plant growth and productivity. Further, the fate of an exogenous inoculum is still poorly understood. Here, we pre-i...

Earthworms and arbuscular mycorrhizal fungi (AMF) are essential for nutrient cycling and organic matter dynamics in terrestrial ecosystems. In soils, they tightly interact especially in the rhizosphere. Therefore, the objective of this study was to evaluate the trophic relationship between the earthworm Pontoscolex corethrurus and three species of...

Resumo Este estudo apresenta o tratamento florístico dos táxons de Leguminosae registrados na vegetação de canga da Serra dos Carajás, estado do Pará. Foram inventariados na área de estudo 74 táxons específicos/infraespecíficos, incluindo tanto as espécies nativas como as adventícias já estabelecidas, pertencentes a 34 gêneros, sendo os mais repres...

Tripartite interactions between legumes and their root symbionts (rhizobia, arbuscular mycorrhizal fungi (AMF)) are poorly understood, although it is well established that only specific combinations of symbionts lead to optimal plant growth. A classic example in which to investigate such interactions is the Brazilian legume tree Piptadenia gonoacan...

Many species of Ziziphus are underutilized crops despite their potential usage in agroforestry systems. The aim of our study was to evaluate the effects of arbuscular mycorrhizal fungi (AMF) on the growth and mineral nutrition of Ziziphus spp. and provenances of Z. mauritiana in greenhouse conditions. Three isolates of AMF were used: Rhizophagus ir...

In this work we explore the radiocarbon ( ¹⁴ C) signal as an independent tool to assess the year of formation of individual tree rings of tropical species in northern Brazil. Three different species were analyzed in this work: Dipteryx magnifica , Enterolobium maximum , and Hymenolobium petraeum . The studied samples are from the stem of only one i...

Some species of the genus Paraburkholderia that are able to nodulate and fix nitrogen in symbiosis with legumes are called β-rhizobia and represent a group of ecological and biotechnological importance. We used Mimosa pudica and Phaseolus vulgaris to trap 427 rhizobial isolates from rhizospheric soil of Mimoseae trees in the Brazilian Atlantic Fore...

During a survey of root-nodulating symbionts of Mimosoid species in South-east region of Brazil, eight Paraburkholderia isolates were obtained from nodules of the legume species Piptadenia gonoacantha, either from the field or following a soil trapping method with the same plant host. 16S rRNA as well as recA and gyrB phylogenetic markers placed th...

The family Leguminosae comprises approximately 20,000 species that mostly form symbioses with arbuscular mycorrhizal fungi (AMF) and nitrogen-fixing bacteria (NFB). This study is aimed at investigating and confirming the dependence on nodulation and biological nitrogen fixation in the specie Piptadenia gonoacantha (Mart.) Macbr., which belongs to t...

Little is known regarding how the increased diversity of nitrogen-fixing bacteria contributes to the productivity and diversity of plants in complex communities. However, some authors have shown that the presence of a diverse group of nodulating bacteria is required for different plant species to coexist. A better understanding of the plant symbiot...

The class Betaproteobacteria contains several related genera that associate closely (and non-pathogenically) with plants. Recent studies have highlighted the emerging importance of newly-discovered legume-nodulating bacteria in the genera Burkholderia and Cupriavidus, the so-called “beta-rhizobia”. Nine species of nodulating burkholderias have been...

he class Betaproteobacteria contains several related genera that associate closely (and non-pathogenically) with plants. Recent studies have highlighted the emerging importance of newly-discovered legume-nodulating bacteria in the genera Burkholderia and Cupriavidus, the so-called “beta-rhizobia”. Nine species of nodulating burkholderias have been...

DNA extraction methods were evaluated for the yield and purity of DNA recovered from mycorrhized roots and whether the recovered DNA is suitable for amplification of arbuscular mycorrhizal (AM) fungal SSU rDNA. The DNeasy Plant Mini Kit and three extraction buffers were used alone or in combination with either polyvinylpyrrolidone (PVP), polyvinylp...

Arbuscular mycorrhizal fungi (AMF) are obligatory biotrophs that have a symbiotic evolutionary relationship with about 80% of all terrestrial plant species. The fungus mainly supplies water and nutrients to the plant and receives photoassimilates. The AMF diversity affects both the competition among species and floristic composition of an area. Flu...

Background Burkholderia species play an important ecological role related to xenobiosis, the promotion of plant growth, the biocontrol of agricultural diseases, and symbiotic and non-symbiotic biological nitrogen fixation. Here, we highlight our study as providing the first complete genome of a symbiotic strain of B. phenoliruptrix, BR3459a (=CLA1)...

Burkholderia is a diverse and dynamic genus, containing pathogenic species as well as species that form complex interactions with plants. Pathogenic strains, such as B. pseudomallei and B. mallei, can cause serious disease in mammals, while other Burkholderia strains are opportunistic pathogens, infecting humans or animals with a compromised immune...

Background and aims Burkholderia tuberum STM678T was isolated from a South African legume, but did not renodulate this plant. Until a reliable host is found, studies on this and other interesting beta-rhizobia cannot advance. We investigated B. tuberum STM678T’s ability to induce Fix+ nodules on a small-seeded, easy-to-propagate legume (Macroptiliu...

Burkholderia legume symbionts (also called β-rhizobia) are ancient in origin and are the main nitrogen-fixing symbionts of species belonging to the large genus Mimosa in Brazil. We investigated the extent of the affinity between Burkholderia and species in the tribe Mimoseae by studying symbionts of the genera Piptadenia (P.), Parapiptadenia (Pp.),...

Sampling sites of nodules, soil and plant material. (PPT)

Sampling sites characteristics and date of nodule collection. Legend: £ pH range indicated for the region when soil was not harvested for pH determination. ND: Not Determined. (DOC)

Nodulation data of representative strains inoculated on Mimosa pudica (at 21 days post-inoculation-dpi) and Piptadenia gonoacantha (60 dpi). Legend: £: Efficiency of symbiosis was estimated as effective or ineffective according to plant development and presence of leghaemoglobin in nodules. %: Letters refer to Figure S2 pictures showing nodules sec...

Primers used for PCR amplification and sequencing. (DOC)

Section of M. pudica and P. gonoacantha nodules induced by different Burkholderia species. Legend: sections (40 micrometer-deep) of M. pudica nodules at 21 days post-inoculation (A to C) induced by B. sabiae STM7373 (A), B. phenoliruptrix STM7317 (B), or Burkholderia sp. 3 STM7296 (C). Sections of P. gonoacantha nodules at 60 dpi (D to E) induced b...

Phylogeny of the nifH gene in alpha and beta-rhizobia from the Piptadenia group of legumes. The phylogeny was built by ML using a GTR model with 1000 bootstraps replicates. See Figure 2 legend for abbreviations and Table S3 for accession numbers. (PPT)

Phylogenies of neutral and symbiotic markers in alpha-rhizobia from the Piptadenia group. The phylogeny of neutral markers (A) is based on a 16 S-recA partition and was built by a Bayesian analysis described in Figure 2 legend, while the symbiotic gene nodC phylogeny (B) was built by Maximum Likelihood with 1000 bootstraps replicates. See Figure 2...

Comparison of phylogenies of neutral markers in rhizobia from the Piptadenia group. Phylogenies of 16 S rDNA (A) and recA (B) were built by Neighbor Joining from a distance matrix corrected by the Kimura 2 method, and with 1000 bootstraps replicates). See Figure 2 legend for abbreviations and Table S3 for accession numbers. (PPT)

Accession numbers of strains from this study and reference strains. Abbreviations: B. : Burkholderia, Br : Bradyrhizobium, R. : Rhizobium, C: Cupriavidus, Pseudo.: Pseudomonas, %: T at the end of the strain name indicates the type strain of a species. (DOC)

A Mata Atlântica, um dos biomas mais ameaçados do Brasil, tem grande demanda pela restauração de seus ecossistemas. As técnicas mais utilizadas na restauração de ecossistemas tropicais incluem o plantio de espécies arbóreas. Mais recentemente, os sistemas agroflorestais (SAF), em que cultivos agrícolas são consorciados com espécies lenhosas perenes...

The threatened caesalpinioid legume Dimorphandra wilsonii, which is native to the Cerrado biome in Brazil, was examined for its nodulation and N(2)-fixing ability, and was compared with another, less-threatened species, D. jorgei. Nodulation and potential N(2) fixation was shown on seedlings that had been inoculated singly with five bradyrhizobial...

Maximum likelihood phylogenetic tree based on the nifH gene (381 nt) showing the position of strains isolated from Dimorphandra wilsonii nodules compared with other rhizobial strains isolated from nodules of different legumes. Bootstrap values were calculated for 1000 replications. Bar, 2 nt substitution per 100 nt. (PDF)

Maximum likelihood phylogenetic tree based on nodD gene sequences (519 nt) showing the position of strains isolated from Dimorphandra wilsonii nodules compared with other rhizobial strains isolated from nodules of different legumes. Bootstrap values were calculated for 1000 replications. Bar, 5 nt substitution per 100 nt. (PDF)

The genus Burkholderia represents a challenge to the fields of taxonomy and phylogeny and, especially, to the understanding of the contrasting roles as either opportunistic pathogens or bacteria with biotechnological potential. Few genomes of nonpathogenic strains, especially of diazotrophic symbiotic bacteria, have been sequenced to improve unders...

Aims We used a Procrustean superimposition approach associated with regression analysis to test hypotheses regarding the relationship between plant communities and distinct below-ground compartments—soil chemis-try (SC) and soil microbial activity (SMA). Additionally, we evaluated litter chemical quality as an interface be-tween the above and below...

Rhizobial symbioses with legumes are not restricted to Alphaproteobacteria, but also occur with two genera (Burkholderia and Cupriavidus) of the Betaproteobacteria, so-called β-rhizobia. β-rhizobia were found mainly to associate mainly with Mimosa (sub-family Mimosoideae). The ß-rhizobia/Mimosa symbiosis being ancient and stable (Bontemps et al., 2...

Acacia mangium Willd., a native tree in Australia and Papua New Guinea, has been introduced to countries in Asia and South America where plantations have been established that cover several hundred thousand ha. The present study investigated the early stages of the nodulation process in A. mangium using an homologous Australian Bradyrhizobium strai...

As espécies de mucuna são muito utilizadas como adubos verdes, e poucas informações estão disponíveis a respeito dos rizóbios nativos capazes de nodulá-las. O objetivo deste trabalho foi avaliar a diversidade e a capacidade simbiótica de isolados bacterianos de nódulos de mucuna-cinza (Mucuna pruriens (L.) DC.) e mucuna-anã (Mucuna deeringiana (Bor...

Introduction Host Specificity and Promiscuity of Legumes with Rhizobium Selection of Rhizobium Strains for High BNF Efficiency Specificity in the Symbioses of Arbuscular Mycorrhizal Fungi (AMF) With Higher Plants Preparation of Tree Seedlings for the Recovery of Degraded Areas Case Studies Conclusions

The main challenges faced in the reclamation of severely degraded lands are in the management of the systems and finding plant species that will grow under the harsh conditions common in degraded soils. This is especially important in extremely adverse situations found in some substrates from mining activities or soils that have lost their upper ho...

Crotalaria are plants of the Fabaceae family whose nodulation characteristics have been little explored despite the recent discovery of their unexpected ability to be efficiently nodulated in symbiosis with bacteria of the genus Methylobacterium. It has been shown that methylotrophy plays a key role in this unusual symbiotic system, as it is expres...

A survey of the structure of nodules from primitive legume trees was conducted. All genera examined in the subfamily Caesalpinioideae, some from the Papilionoideae, but none from the Mimosoideae had cells in the central, nitrogen-fixing region in which bacteria were confined by host cell wall material in structures resembling infection threads. How...

The use of legume tree seedlings inoculated with selected nitrogen-fixing bacteria and mycorrhizal fungi has proved to be an efficient strategy to revegetate soils where the superficial horizons have been lost. The main advantages of these plants are their increased capacity to establish and produce high amounts of biomass in adverse soil condition...

The diversity of ectomycorrhizal (ECM) fungi on adult trees and seedlings of five species, Anthonotha fragrans, Anthonotha macrophylla, Cryptosepalum tetraphyllum, Paramacrolobium coeruleum and Uapaca esculenta, was determined in a tropical rain forest of Guinea. Ectomycorrhizae were sampled within a surface area of 1600 m(2), and fungal taxa were...

*An extensive survey of nodulation in the legume genus Mimosa was undertaken in two major biomes in Brazil, the Cerrado and the Caatinga, in both of which there are high degrees of endemicity of the genus. *Nodules were collected from 67 of the 70 Mimosa spp. found. Thirteen of the species were newly reported as nodulating. Nodules were examined by...

Numerous leguminous species are used or have potential uses for timber production, pharmacological products, or land reclamation. Through N(2)-fixation, many leguminous trees contribute to the N-balance of tropical wetlands and rainforests. Therefore, studies of the N(2)-fixation ability of leguminous species appear to be crucial for the better use...

Burkholderia has only recently been recognized as a potential nitrogen-fixing symbiont of legumes, but we find that the origins of symbiosis in Burkholderia are much deeper than previously suspected. We sampled 143 symbionts from 47 native species of Mimosa across 1800 km in central Brazil and found that 98% were Burkholderia. Gene sequences define...