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Legume growth-promoting rhizobia: An overview on the Mesorhizobium genus
Laranjo, Marta; Alexandre, Ana; Oliveira, SolangeThe need for sustainable agricultural practices is revitalizing the interest in biological nitrogen fixationand rhizobia-legumes symbioses, particularly those involving economically important legume crops interms of food and forage. The genus Mesorhizobium includes species with high geographical dispersionand able to nodulate a wide variety of legumes, including important crop species, like chickpea or bis-erru...
Global Transcriptional Response to Heat Shock of the Legume Symbiont Mesorhizob...
Alexandre, Ana; Laranjo, Marta; Oliveira, SolangeRhizobia, the bacterial legume symbionts able to fix atmospheric nitrogen inside root nodules, have to survive in varied environmental conditions. The aim of this study was to analyse the transcriptional response to heat shock ofMesorhizobium lotiMAFF303099, a rhizobium with a large multipartite genome of 7.6 Mb that nodulates the model legume Lotus japonicus. Using microarray analysis, extensive transcriptomic...
Response to temperature stress in rhizobia
Alexandre, Ana; Oliveira, SolangeIt is well established that soil is a challenging environment for bacteria, where conditions may change rapidly and bacteria have to acclimate and adapt in order to survive. Rhizobia are an important group of soil bacteria due to their ability to establish atmospheric nitrogen-fixing symbioses with many legume species. Some of these legumes are used to feed either humans or cattle and therefore the use of rhizo...
Transcriptional analysis of major chaperone genes in salt-tolerant and salt-sen...
Brígido, Clarisse; Alexandre, Ana; Oliveira, SolangeSalinity is an important abiotic stress that limits rhizobia-legume symbiosis, affecting plant growth, thus reducing crop productivity. Our aims were to evaluate the tolerance to salinity of native chickpea rhizobia as well as to investigate the expression of chaperone genes groEL, dnaKJ and clpB in both tolerant and sensitive isolates. One hundred and six native chickpea mesorhizobia were screened for salinity...
Most heat-tolerant rhizobia show high induction of major chaperone genes upon s...
Alexandre, Ana; Oliveira, SolangeThe aims of this study were to evaluate the temperature stress tolerance of chickpea rhizobia and to investigate whether tolerance is related to the species or the site of origin of the isolates. Additionally, the molecular bases of temperature stress tolerance in rhizobia were investigated, by comparing the expression of chaperone genes dnaKJ and groESL in thermotolerant and thermosensitive isolates. Tolerance...
Survey of Chickpea Rhizobia Diversity in Portugal Reveals the Predominance of S...
Alexandre, Ana; Brígido, Clarisse; Laranjo, Marta; Rodrigues, Sérgio; Oliveira, SolangeSeveral Mesorhizobium species are able to induce effective nodules in chickpea, one of the most important legumes worldwide. Our aims were to examine the biogeography of chickpea rhizobia, to search for a predominant species, and to identify the most efficient microsymbiont, considering Portugal as a case study. One hundred and ten isolates were obtained from continental Portugal and Madeira Island. The 16S rib...
Customer lifetime value na banca
Alexandre, Ana Margarida GomesMestrado em Prospecção e Análise de Dados ; Ao longo do tempo, as instituições financeiras, muito em particular os bancos, têm cada vez mais apostado na implementação, na gestão de processos e em métricas que possibilitem a gestão do relacionamento com os clientes, e o próprio conhecimento inteligente sobre o valor dos mesmos. Uma das possíveis métricas a utilizar é o Customer Lifetime Value (CLTV), que tem vi...
Chickpea rhizobia symbiosis genes are highly conserved across multiple Mesorhiz...
Laranjo, Marta; Alexandre, Ana; Rivas, Raul; Velázquez, Encarna; Young, J. Peter W.; Oliveira, SolangeABSTRACT Chickpea has been considered as a restrictive host for nodulation by rhizobia. However, recent studies have reported that several Mesorhizobium species may effectively nodulate chickpea. With the purpose of investigating the evolutionary relationships between these different species with the ability of nodulating the same host, we analysed 21 Portuguese chickpea rhizobial isolates. Symbiosis genes nifH...
dnaJ is a useful phylogenetic marker for alphaproteobacteria
Alexandre, Ana; Laranjo, Marta; Young, J. Peter W.; Oliveira, SolangeSummary In the past, bacterial phylogeny relied almost exclusively on 16S rRNA gene sequence analysis. More recently, multilocus sequences have been used to infer organismal phylogenies. In this study, the dnaJ chaperone gene was investigated as a marker for phylogeny studies in alphaproteobacteria. Preliminary analysis of G+C and G+C3s contents showed no clear evidence of horizontal transfer of this gene in...
Molecular Tools in Microbial Ecology
Oliveira, Solange; Laranjo, Marta; Alexandre, AnaEditors: Laia Diaz and Marta Perez Book Description: The new book presents the latest research on ecology which is the study of the interrelationships between organisms and their environment, including the biotic and abiotic components. There are at least six kinds of ecology: ecosystem, physiological, behavioral, population, and community. Specific topics include: Acid Deposition, Acid Rain Revisited, Biodiv...
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