Rhizobium huautlense sp. nov., a symbiont of Sesbania herbacea that has a close phylogenetic relationship with Rhizobium galegae

Wang, E. T.; Berkum, Peter van; Beyene, Desta; Sui, Xinhua; Dorado, Óscar; Chen, W. X.; Martı́nez-Romero, Esperanza

doi:10.1099/00207713-48-3-687

Cited by 139 publications

(83 citation statements)

References 48 publications

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“…However, reliance cannot be placed on any particular sequence comparison, Classifications, gene transfer and bacterial taxonomy because analyses give differing results depending on the algorithm chosen and particularly on the selection of included sequences. This is shown by comparison of inferred phylogenies in recent reports (Amarger et al, 1997 ;Chen et al, 1997 ;de Lajudie et al, 1994de Lajudie et al, , 1998aNour et al, 1994 ;Rome et al, 1996 ;Tan et al, 1997 ;van Berkum et al, 1998 ;Wang et al, 1998 ;Willems & Collins, 1993). The reasons given by de Lajudie et al (1998b) for proposing the new genus were the unsettled state of Agrobacterium nomenclature and the evidence of heterogeneity (in phylogenetic terms) in Rhizobium, which implied to them the need for the creation of a new genus separate from Agrobacterium and Rhizobium.…”

Section: International Journal Of Systematic and Evolutionary Microbimentioning

confidence: 98%

Implications of alternative classifications and horizontal gene transfer for bacterial taxonomy.

Young¹

2001

International Journal of Systematic and Evolutionary Microbiology

165

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Following the publication of the Approved Lists, there has been a tendency to regard all subsequent revisions of classification as providing improved nomenclature, to be accepted without question. This takes no account of the fact that such revisions may be based on one of three alternative concepts, phenetic, phylogenetic or polyphasic classification, sometimes leading to different, valid, but incompatible nomenclature, or that some investigations are based only on subsets of relevant taxa and on limited data, leading to incomplete and sometimes confusing revisions of nomenclature. The polyphasic approach to classification has widespread support, although there appears to be a tendency to allow comparative sequence analyses of 16S rDNA to determine classification contrary to the indications of other data. In some cases, classification is based solely on 16S rDNA data. Examples are considered. Consideration is given to the criteria by which taxa are circumscribed, particularly at the level of genus and species. It is suggested that there is a need for reconciliation of the criteria by which taxa at these levels are circumscribed. Recent studies demonstrating the widespread occurrence of horizontal gene transfer suggest that there is a need for caution in monophyletic interpretations, especially when these are based on the analysis of single sequences. Keywords : phenetic, phylogenetic, polyphasic, bacterial systematics IntroductionAlthough Staley & Krieg (1984) wrote that ' bacterial classifications are devised for microbiologists, not for the entities being classified ', bacteriologists do not necessarily agree about the aims of classification. The several systems of bacterial classification that are in vogue at present are incompatible, sometimes leading to different classifications and to different schemes of bacterial nomenclature. Unless the principles underlying different classifications are understood, these different applications of names cause bewilderment. The thrust of this article is to show that no one system of classification is supreme, each offering a different perspective on evolutionary processes and serving different purposes in systematics. One problem that particularly besets discussions on bacterial taxonomy is that some terms derived elsewhere and often in the distant past are poorly defined or are used in different ways by different writers. For example, see the history of the usage of ' polyphasic ' described below. Ambiguity and lack of precision of usage are real causes of confusion. In attempting to maintain simplicity without confusion, terms are referred to Cowan (1978) and Lincoln et al. (1998) unless further explanation is felt necessary. Terms used here are not inconsistent with Tindall (1997).In 1980, the Approved Lists (Skerman et al., 1980) recorded 1792 validly published species names in 290 genera (6n2 species per genus) (Euze! by, 1997). One expectation of modern systematics has been that the increasing numbers of methods and sophisticated tools for analysis would form co...

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Section: International Journal Of Systematic and Evolutionary Microbimentioning

confidence: 98%

Implications of alternative classifications and horizontal gene transfer for bacterial taxonomy.

Young¹

2001

International Journal of Systematic and Evolutionary Microbiology

165

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“…Esse meio de cultura é utilizado para discriminar espécies de rizóbio (WANG et al, 1998;MARTINEZ-ROMERO et al, 1991). Como a composição original do meio LB apresenta 10 g L -1 de NaCl, para este estudo, além dessa concentração, foram também testadas as seguintes concentrações: 1, 2; 2,5; 3; 20; 30 e 50 g L -1 .…”

Section: Experimento 2: Tolerância De Rizóbio à Salinidade Em Meio Deunclassified

“…Nesse meio, a fonte principal de carbono é a peptona de caseína, que representa um fator limitante para o crescimento de algumas espécies bacterianas, pois, nem todas têm capacidade de degradá-la em meio de cultura. Essa característica tem sido usada como diferencial para a descrição de novas espécies bacterianas, inclusive rizóbio (WANG et al, 1998;MARTINEZ-ROMERO et al, 1991).…”

Section: Experimento 2: Tolerância De Rizóbio à Salinidade Em Meio Deunclassified

Tolerância de bactérias diazotróficas simbióticas à salinidade in vitro

Nóbrega¹,

Motta²,

Lacerda³

et al. 2004

Ciênc. agrotec.

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RESUMOA busca de estirpes de bactérias diazotróficas simbióticas tolerantes à salinidade, em conjunto com a seleção de hospedeiros, tem por objetivo aumentar o desempenho da simbiose e manter a produtividade vegetal de forma sustentada em condições de estresse salino. Doze estirpes de bactérias diazotróficas de diferentes procedências foram estudadas quanto à tolerância a diferentes concentrações de NaCl em meios de cultura 79 e LB. As estirpes que apresentaram maior tolerância à salinidade (30 g L -1 ) em meio 79 foram: BR 6806 e BR 4007, ambas de crescimento rápido isoladas de solos do Nordeste brasileiro, UFLA 03-51 e UFLA 03-65, de crescimento rápido e UFLA 03-84, de crescimento lento, sendo as três últimas oriundas da Região Amazônica. Essas também estiveram entre as mais tolerantes em meio de cultura LB. A estirpe UFLA 03-84, selecionada em trabalhos prévios por sua alta eficiência para caupi (Vigna unguiculata), pode ser indicada para estudos de inoculação, visando a aumentar o rendimento dessa cultura em solos salinos. Os meios de cultura 79 e LB foram eficientes para avaliar a tolerância relativa de rizóbio a NaCl, mas o meio 79 é mais indicado, pois permite o crescimento de todas as estirpes. Pelos resultados, infere-se haver relação entre tolerância in vitro à salinidade e origem dos microssimbiontes, pois as estirpes BR 4007 e BR 6806, oriundas do Ceará, estiveram entre as mais tolerantes.Termos para indexação: Rizóbio, NaCl, estresse, Vigna unguiculata. ABSTRACTTolerance to salinity of diazotrophic bacteria and their host species could increase plant growth and sustainability in salt stressed soils. Twelve diazotrophic bacteria strains were studied regarding their tolerance to different NaCl concentrations in 79 and LB media. More tolerant (30 g L -1 ) strains in 79 medium were: the fast growers BR 6806 and BR 4007, isolated from northeast Brazil, UFLA 03-51 and UFLA 03-65, and slow growing strain UFLA03-84, being these last three isolated from Amazon region. These strains were among the most salt tolerant in LB medium. The high salt tolerance of strain UFLA 03-84, as well as its highest efficiency (biological nitrogen fixation) in cowpea symbiosis (Vigna unguiculata), indicates it can be assayed as inoculant to improve yields of this species at saline soils. Media 79 and LB were efficient to evaluate relative tolerance of rhizobia to NaCl, however 79 medium is more suitable as it allows growth of all strains.

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“…nov. LXD30 T (present study); 2, R. huautlense SO2 T (Wang et al, 1998); 3, R. cellulosilyticum LMG 23642 T (García-Fraile et al, 2007); 4, R. galegae ATCC 43677 T (Lindström, 1989). +, positive; w, weakly positive; , negative; ND, no data available.…”

Section: Phylogenetic Analysismentioning

confidence: 99%

Rhizobium kunmingense sp. nov., isolated from rhizosphere soil of Camptotheca acuminata Decne

Shen

Zheng

Liu

et al. 2010

J. Gen. Appl. Microbiol.

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Rhizobium huautlense sp. nov., a symbiont of Sesbania herbacea that has a close phylogenetic relationship with Rhizobium galegae

Cited by 139 publications

References 48 publications

Implications of alternative classifications and horizontal gene transfer for bacterial taxonomy.

Implications of alternative classifications and horizontal gene transfer for bacterial taxonomy.

Tolerância de bactérias diazotróficas simbióticas à salinidade in vitro

Rhizobium kunmingense sp. nov., isolated from rhizosphere soil of Camptotheca acuminata Decne

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