A5073716311- Legume Nitrogen Fixing Symbiosis
- Soybean genetics and cultivation
- Agronomic Practices and Intercropping Systems
- Soil Management and Crop Yield
- Growth and nutrition in plants
- Nematode management and characterization studies
- Plant Pathogens and Fungal Diseases
- Mycorrhizal Fungi and Plant Interactions
- Plant-Microbe Interactions and Immunity
- Banana Cultivation and Research
- Plant nutrient uptake and metabolism
- Fungal Biology and Applications
- Cassava research and cyanide
- Coastal wetland ecosystem dynamics
- Soil Carbon and Nitrogen Dynamics
- Microbial Community Ecology and Physiology
- Biofuel production and bioconversion
- Agricultural pest management studies
- Plant tissue culture and regeneration
- Genomics and Phylogenetic Studies
- Plant Pathogenic Bacteria Studies
- Agricultural and Food Sciences
- Enzyme Production and Characterization
- Fermentation and Sensory Analysis
- Yeasts and Rust Fungi Studies
Brazilian Agricultural Research Corporation
2015-2024
Universidade Federal de Roraima
2006-2011
Agricultural Research Corporation
2008
Universidade Estadual de Roraima
2004-2007
Empresa de Pesquisa Agropecuária do Estado do Rio de Janeiro
1998
Herein the members of Subcommittee on Taxonomy Rhizobia and Agrobacteria International Committee Systematics Prokaryotes review recent developments in rhizobial agrobacterial taxonomy propose updated minimal standards for description new species (and genera) these groups. The essential requirements (minimal standards) a are (1) genome sequence at least proposed type strain (2) evidence differentiation from other based comparisons. It is also recommended that (3) genetic variation within...
Background This study is the first to investigate Brazilian Amazonian Forest identify new D-xylose-fermenting yeasts that might potentially be used in production of ethanol from sugarcane bagasse hemicellulosic hydrolysates. Methodology/Principal Findings A total 224 yeast strains were isolated rotting wood samples collected two forest reserve sites. These cultured nitrogen base (YNB)-D-xylose or YNB-xylan media. Candida tropicalis, Asterotremella humicola, boidinii and Debaryomyces hansenii...
16S rRNA gene sequence analysis of eight strains (BR 3299(T), BR 3296, 10192, 10193, 10194, 10195, 10196 and 10197) isolated from nodules cowpea collected a semi-arid region Brazil showed 97 % similarity to sequences recently described rhizobial species the genus Microvirga. Phylogenetic analyses four housekeeping genes (gyrB, recA, dnaK rpoB), DNA-DNA relatedness AFLP further indicated that these belong novel within Our data support hypothesis related nitrogen fixation were obtained via...
Abiotic stress is one of the major limiting factors for plant development and productivity, which makes it important to identify microorganisms capable increasing tolerance stress. Dark septate endophytes can be symbionts plants. In present study, we evaluated ability dark isolates reduce effects water in rice varieties Nipponbare Piauí. The experiments were performed under gnotobiotic conditions, was induced with PEG. Four isolated from roots wild (Oryza glumaepatula) collected Brazilian...
Azospirillum sp. strain Sp245 T , originally identified as belonging to brasilense is recognized a plant-growth-promoting rhizobacterium due its ability fix atmospheric nitrogen and produce plant-beneficial compounds. other related strains were isolated from the root surfaces of different plants in Brazil. Cells are Gram-negative, curved or slightly rods, motile with polar lateral flagella. Their growth temperature varies between 20 38 °C their carbon source utilization similar species. A...
Dark septate endophytic (DSE) fungi are facultative biotrophs that associate with hundreds of plant species, contributing to their growth. These may therefore aid in the search for sustainable agricultural practices. However, several ecological functions DSE need further clarification. The present study investigated effects inoculation on nutrient recovery efficiency, accumulation, and growth tomato plants fertilized organic inorganic N sources. Two experiments were carried out under...
The use of dark septate fungi (DSE) to promote plant growth can be beneficial agriculture, and these organisms are important allies in the search for sustainable agriculture practices. This study investigates contribution absorption nutrients by rice plants their ensuing growth. Four isolates that were identified Internal transcribed spacer phylogeny inoculated seeds (Cv. Piauí). resulting root colonization was estimated kinetic parameters V max K m calculated from nitrate contents nutrient...
O estudo objetivou avaliar a contribuição da fixação biológica de nitrogênio (FBN) promovida por estirpes rizóbio para o desenvolvimento e rendimento grãos do feijão-caupi em Roraima. Nos anos 2005 2006 foram conduzidos experimentos área cerrado mata alterada, onde testadas as INPA 03-11B, UFLA 3-84, BR3267 (recomendadas à cultura), estirpe BR3299 BR3262, duas doses mineral (50 80 kg ha-1 N) um controle. As variáveis avaliadas foram: nodulação produção massa seca parte aérea plantas e, na...
We investigated the endophytic fungal community associated with Amazonian medicinal plant Carapa guianensis and its potential for providing bioactive compounds. A total of 162 isolates were obtained identified by molecular methods. These classified into 35 different taxa in genera Aspergilllus, Beltrania, Botryosphaeria, Colletotrichum, Diaporthe, Endomelanconiopsis, Fusarium, Guignardia, Pestalotiopsis, Phomopsis, Pilidiella, Trichoderma, Xylaria. The most frequent colonisers recovered C....
Soil quality is an ample concept referring to the equilibrium between chemical, physical and biological components of soil. In order evaluate soil it has been postulated need identifying indicatives parameters conservation and/or degradation. Microorganisms are at base food web related with several ecological processes, therefore, microbial diversity considered important indicator quality. This generally presented as indexes due difficulties in assessing interpreting its role within...
O objetivo deste trabalho foi avaliar as relações filogenéticas de estirpes Bradyrhizobium e a contribuição destas para fixação biológica nitrogênio em caupi, solos do Cerrado. Na avaliação da relação filogenética, o gene 16S rDNA cada uma das amplificado seqüenciado, análise eficiência simbiótica, determinou-se: N total, matéria seca plantas, massa nódulos redução acetileno, casa vegetação, ocupação nodular, experimento campo. A maioria estudadas pertence B. elkanii e, pelo menos dez...
Biological N2 fixation is a major factor contributing to the increased competitiveness of Brazilian soybeans on international market. However, contribution this process may be limited by adverse conditions symbiotic bacteria, such as fungicide seed treatments. This study aimed evaluate effects fungicides carbendazim + thiram and carboxin soybean nodulation, plant growth grain yield. Two field experiments were carried out in Cerrado region State Roraima, soil with low organic matter content...
Summary Brazilian sugarcane has been shown to obtain part of its nitrogen via biological fixation ( BNF ). Recent reports, based on the culture independent sequencing bacterial nifH complementary DNA cDNA ) from tissues, have suggested that members B radyrhizobium genus could play a role in sugarcane‐associated . Here we report isolation spp. isolates and few other species roots cultivar RB 867515 by two cultivation strategies: direct media capture using promiscuous legume V igna unguiculata...
Root nodule bacteria were trapped within cowpea (Vigna unguiculata) in soils with different cultivation histories collected from the Amazonian rainforest northern Brazil. Analysis of 16S rRNA gene sequences six strains (BR 3351(T), BR 3307, 3310, 3315, 3323 and 3361) isolated nodules showed that they formed a distinct group genus Bradyrhizobium, which was separate previously identified type strains. Phylogenetic analyses three housekeeping genes (glnII, recA rpoB) revealed Bradyrhizobium...
Root nodule bacteria were isolated from Centrolobium paraense Tul. grown in soils the Amazon region, State of Roraima (Brazil). 16S rRNA gene sequence analysis seven strains (BR 10247 T , BR 10296, 10297, 10298, 10299, 10300 and 10301) placed them genus Bradyrhizobium with closest neighbours being type paxllaeri (98.8 % similarity), icense %), lablabi (98.7 jicamae (98.6 elkanii pachyrhizi %) retamae (98.3 %). This high similarity, however, was not confirmed by intergenic transcribed spacer...
Core Ideas Inoculum rate with elite strains is critical to achieve the benefits of biological N 2 fixation. The minimum 1.2 × 10 6 cells Bradyrhizobium seed −1 was determined benefit Soybean can highly from Some sites required 2.4 and could respond higher rates. [ Glycine max (L.) Merr.] inoculation , selected for high capacity However, benefits, must be capable effectively nodulate host, inoculum may critical, especially under stressing tropical environmental conditions. We performed field...
The introduction of legumes and nitrogen-fixing bacteria in tropical areas under pasture is a key factor for improvement soil fertility. However, there are still very few studies concerning the symbionts forage legumes. We performed polyphasic study with three strains representing genus Bradyrhizobium (BR 446T, BR 510 511) isolated from perennial legume Stylosanthes. On basis 16S rRNA gene sequences, showed highest similarity B. huanghuaihaiense , analysis intergenic transcribed spacer (ITS)...
Abstract: The symbiotic interaction between arbuscular mycorrhizal fungi (AMF) and 70-90% of the plant species is largely studied, but ectomycorrhizal fungi, Piriformospora indica, Trichoderma sp., dark septate endophytes (DSE), also establish beneficial interactions with plants. Despite this, joint discussion on biochemical, physiological, molecular aspects nutrient transfer, mainly from extraradical mycelium (ERM) to plant, still limited. objective this review present approaches plant-AMF...
The establishment of the rhizobium-legume symbiosis is generally based on plant perception Nod factors (NFs) synthesized by bacteria. However, some Bradyrhizobium strains can nodulate certain legume species, such as Aeschynomene spp. or Glycine max, independently NFs, and via two different processes that are distinguished necessity not a type III secretion system (T3SS). ErnA first known effector (T3E) triggering nodulation in indica. In this study, collection 196 sequenced was tested A....
Root-nodule bacteria were isolated from Inga laurina (Sw.) Willd. growing in the Cerrado Amazon region, State of Roraima, Brazil. The 16S rRNA gene sequences six strains (BR 10250(T), BR 10248, 10249, 10251, 10252 and 10253) showed low similarities with currently described species genus Bradyrhizobium. Phylogenetic analyses five housekeeping genes (dnaK, glnII, gyrB, recA rpoB) revealed Bradyrhizobium iriomotense EK05(T) to be closest type strain (97.4% sequence similarity or less)....