phosphate solubilization by microorganisms from the rhizosphere of pigeonpea genotypes grown in different soil/
solubilização de fosfato por microrganismos rizosféricos de genótipos de guandu cultivados em diferentes classes de solo

คลิก: 430
รหัส: 189156
2007
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บทคัดย่อ
P-solubilizing microorganisms were isolated from the rhizosphere of six genotypes of pigeonpea (Cajanus cajan L. Millsp.) grown in pots containing soil from six classes: “Luvissolo”, “Cambissolo”, “Cambissolo Eutrófico”, “Argissolo Vermelho Amarelo”, “Neossolo Regolítico” and “Vertissolo”. All soils came from the Northeast region of Brazil. Eighty-five isolates were fungi and 46 bacteria. Eleven fungal isolates came from “Cambisssolo Eutrófico” cultivated with the genotype D1-Type; fourteen and ten isolates of bacteria came from “Neossolo Regolítico” cultivated with genotype Moreilândia and D1-Type, respectively. For the other soil classes, the number of bacteria was much lower (2 isolates). In vitro phosphate solubilization by 131 microorganisms was performed after incubation in liquid medium containing 2000 mg L-1 of “Araxá” apatite. The majority of fungal isolates decreased the pH to the range from 2.0 to 4.0 and bacteria from 4.0 to 6.5. Soluble P averaged 122 and 15 mg P L-1 for fungi and bacteria, respectively. Fifteen fungi isolates (14 Aspergillus and 1 Penicillium) more able in solubilizing P in liquid medium were chosen for identification. The amount of solubilized P and the number of P-solubilizing isolates depended on the soil type and pigeonpea genotype. Further studies should be performed to elucidate these interactions.

Microrganismos solubilizadores de fosfato foram isolados da rizosfera de seis genótipos de guandu (Cajanus cajan L. Millsp.) cultivados em vasos contendo solo pertencente a seis diferentes classes: Luvissolo, Cambissolo, Cambissolo Eutrófico, Argissolo Vermelho Amarelo, Neossolo Regolítico, Vertissolo, todos da região nordeste brasileira. Fungos foram obtidos em maior número (85) que bactérias (46). Um maior número (11) de fungos foi proveniente do Cambissolo Eutrófico cultivado com o genótipo D1-Type; um total de 24 isolados de bactéria foi proveniente do Neossolo Regolítico cultivado com os genótipos Moreilândia (14) e D1-Type (10), isolando-se um número bem menor (2) nos demais solos. A solubilização de fosfato de Araxá por 131 isolados foi quantificada em meio líquido contendo 2000 mg L- 1 de meio líquido. A maioria dos fungos baixou o pH do meio de 6,5 para valores entre 2,0 e 4,0, enquanto que, para as bactérias, a variação foi de 4,0 e 6,5. As médias de P solubilizado foram de 122 e 15 mg L-1 para os fungos e bactérias, respectivamente. Identificaram-se 15 isolados (14 sendo Aspergillus e 1 Penicillium) com maior habilidade em solubilizar P. O teor de P solubilizado e o número de isolados solubilizadores dependeram do tipo de solo e do genótipo de guandu. Estudos mais detalhados são necessários para melhor elucidar essas interações.

คีย์อ้างอิง
abboud2007semina:phosphate ใช้คีย์นี้เพื่ออ้างอิงอัตโนมัติในต้นฉบับขณะใช้งาน SciMatic Manuscript Manager หรือ Thesis Manager
ผู้เขียน ;Antonio Carlos de Souza Abboud;Edson Luiz Souchie
วารสาร frontiers in neuroendocrinology
ปี 2007
DOI
10.5433/1679-0359.2007v28n1p11
URL
http://www.uel.br/revistas/uel/index.php/semagrarias/article/view/2543
คำสำคัญ
Agriculture (General) cajanus cajan fosfato natural

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