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Registro Completo
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
14/06/1999 |
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Data da última atualização: |
14/06/1999 |
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Autoria: |
MARTINS, L. M. V.; NEVES, M. C. P.; RUMJANEK, N. G. |
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Título: |
Growth characteristics and symbiotic efficiency of rhizobia isolated from cowpea nodules of the North-East region of Brazil. |
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Ano de publicação: |
1997 |
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Fonte/Imprenta: |
Soil Biology and Biochemistry, Oxford, v. 29, n. 5/6, p.1005-1010, 1997. |
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Idioma: |
Inglês |
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Conteúdo: |
In Brazil, the geo-environmental conditions of the north-east region exert an effect on the rhizobia diversity. A large collection of rhizobia isolates were obtained from nodules of cowpea planted in different soils from this region of Brazil. Cowpea was selected as the scavenger for this study of rhizobia diversity because it is a known broad host-range leguminous plant and it is also widespread in the region. A total of 536 nodule isolates were obtained and later arranged in 78 different groups based on colony morphology and growth. Growth in culture media of isolate representatives of these groups revealed that 27 of them showed fast growth characteristics although the plant is characteristically nodulated by strains described as Bradyrhizobium spp. Furthermore, the analysis of the isolates from each region showed an increased proportion of fast-growing rhizobia when going from the coast to the semi-arid region. Fifty-five of the rhizobia representatives from the Brazilian north-east region induced Hup+ phenotype in cowpea nodules indicating the predominance of this phenotype. They were also inoculated into soybean, since this legume plant is nodulated by the slow-growing rhizobia species B. japonicum and B. elkanii. Twenty-five of the group representatives were not capable of nodulating soybean. Inoculation with some of them promoted the formation of pseudo-nodule structures which despite not contributing significantly to the nitrogen content of the plant are an indication that signal exchange between plant and rhizobia is occurring. The remaining isolate representatives were capable of nodulating soybean. The nodulation of soybean by the isolates in soils of the semi-arid region of Brazil is quite remarkable since this crop has never been cultivated in the region before. Data on host-regulated uptake hydrogenase phenotype (Hup-hr) is discussed. MenosIn Brazil, the geo-environmental conditions of the north-east region exert an effect on the rhizobia diversity. A large collection of rhizobia isolates were obtained from nodules of cowpea planted in different soils from this region of Brazil. Cowpea was selected as the scavenger for this study of rhizobia diversity because it is a known broad host-range leguminous plant and it is also widespread in the region. A total of 536 nodule isolates were obtained and later arranged in 78 different groups based on colony morphology and growth. Growth in culture media of isolate representatives of these groups revealed that 27 of them showed fast growth characteristics although the plant is characteristically nodulated by strains described as Bradyrhizobium spp. Furthermore, the analysis of the isolates from each region showed an increased proportion of fast-growing rhizobia when going from the coast to the semi-arid region. Fifty-five of the rhizobia representatives from the Brazilian north-east region induced Hup+ phenotype in cowpea nodules indicating the predominance of this phenotype. They were also inoculated into soybean, since this legume plant is nodulated by the slow-growing rhizobia species B. japonicum and B. elkanii. Twenty-five of the group representatives were not capable of nodulating soybean. Inoculation with some of them promoted the formation of pseudo-nodule structures which despite not contributing significantly to the nitrogen content of the plant are an indicati... Mostrar Tudo |
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Palavras-Chave: |
Brasil; Caupi; Efficiency; Growth; Root nodulation. |
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Thesagro: |
Crescimento; Eficiência Nutricional; Feijão de Corda; Nodulação; Nódulo; Rhizobium; Soja; Solo. |
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Thesaurus NAL: |
Brazil; cowpeas; root nodules; soil; soybeans. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02839naa a2200361 a 4500
001 1621096
005 1999-06-14
008 1997 bl uuuu u00u1 u #d
100 1 $aMARTINS, L. M. V.
245 $aGrowth characteristics and symbiotic efficiency of rhizobia isolated from cowpea nodules of the North-East region of Brazil.
260 $c1997
520 $aIn Brazil, the geo-environmental conditions of the north-east region exert an effect on the rhizobia diversity. A large collection of rhizobia isolates were obtained from nodules of cowpea planted in different soils from this region of Brazil. Cowpea was selected as the scavenger for this study of rhizobia diversity because it is a known broad host-range leguminous plant and it is also widespread in the region. A total of 536 nodule isolates were obtained and later arranged in 78 different groups based on colony morphology and growth. Growth in culture media of isolate representatives of these groups revealed that 27 of them showed fast growth characteristics although the plant is characteristically nodulated by strains described as Bradyrhizobium spp. Furthermore, the analysis of the isolates from each region showed an increased proportion of fast-growing rhizobia when going from the coast to the semi-arid region. Fifty-five of the rhizobia representatives from the Brazilian north-east region induced Hup+ phenotype in cowpea nodules indicating the predominance of this phenotype. They were also inoculated into soybean, since this legume plant is nodulated by the slow-growing rhizobia species B. japonicum and B. elkanii. Twenty-five of the group representatives were not capable of nodulating soybean. Inoculation with some of them promoted the formation of pseudo-nodule structures which despite not contributing significantly to the nitrogen content of the plant are an indication that signal exchange between plant and rhizobia is occurring. The remaining isolate representatives were capable of nodulating soybean. The nodulation of soybean by the isolates in soils of the semi-arid region of Brazil is quite remarkable since this crop has never been cultivated in the region before. Data on host-regulated uptake hydrogenase phenotype (Hup-hr) is discussed.
650 $aBrazil
650 $acowpeas
650 $aroot nodules
650 $asoil
650 $asoybeans
650 $aCrescimento
650 $aEficiência Nutricional
650 $aFeijão de Corda
650 $aNodulação
650 $aNódulo
650 $aRhizobium
650 $aSoja
650 $aSolo
653 $aBrasil
653 $aCaupi
653 $aEfficiency
653 $aGrowth
653 $aRoot nodulation
700 1 $aNEVES, M. C. P.
700 1 $aRUMJANEK, N. G.
773 $tSoil Biology and Biochemistry, Oxford$gv. 29, n. 5/6, p.1005-1010, 1997.
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