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Id: lil-755827
Autor: Ruíz-Valdiviezo, Víctor Manuel; Canseco, Lucía María Cristina Ventura; Suárez, Luis Antonio Castillo; Gutiérrez-Miceli, Federico Antonio; Dendooven, Luc; Rincón-Rosales, Reiner.
Título: Symbiotic potential and survival of native rhizobia kept on different carriers
Fonte: Braz. j. microbiol;46(3):735-742, July-Sept. 2015. tab, ilus.
Idioma: en.
Resumo:

Native rhizobia are ideal for use as commercial legume inoculants. The characteristics of the carrier used to store the inoculants are important for the survival and symbiotic potential of the rhizobia. The objective of this study was to investigate the effects of peat (PEAT), perlite sugarcane bagasse (PSB), carboxymethyl cellulose plus starch (CMCS), and yeast extract mannitol supplemented with mannitol (YEMM) on the survival, nodulation potential and N2 fixation capacity of the native strains Sinorhizobium mexicanum ITTG R7T and Rhizobium calliandrae LBP2-1T and of the reference strain Rhizobium etli CFN42T. A factorial design (4 × 3) with four repetitions was used to determine the symbiotic potential of the rhizobial strains. The survival of the strains was higher for PEAT (46% for strain LBP2-1T, 167% for strain CFN42T and 219% for strain ITTG R7T) than for the other carriers after 240 days, except for CFN42T kept on CMCS (225%). All the strains kept on the different carriers effectively nodulated common bean, with the lowest number of nodules found (5 nodules) when CFN42T was kept on CMCS and with the highest number of nodules found (28 nodules) when ITTG R7T was kept on PSB. The nitrogenase activity was the highest for ITTG R7T kept on PEAT (4911 μmol C2H4 per fresh weight nodule h−1); however, no activity was found when the strains were kept on YEMM. Thus, the survival and symbiotic potential of the rhizobia depended on the carrier used to store them.

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Descritores: Fertilizantes/microbiologia
Phaseolus/crescimento & desenvolvimento
Phaseolus/microbiologia
Rhizobium/metabolismo
Sinorhizobium/metabolismo
Simbiose/fisiologia
-Óxido de Alumínio/química
Carboximetilcelulose Sódica/química
Celulose/química
Manitol/química
Fixação de Nitrogênio/fisiologia
Nodulação/fisiologia
Rizosfera
Microbiologia do Solo
Dióxido de Silício/química
Solo/química
Amido/análogos & derivados
Amido/química
Leveduras/química
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: BR1.1 - BIREME



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