Intracellular Burkholderia strain has no negative effect on the symbiotic efficiency of the arbuscular mycorrhizal fungus Gigaspora margarita |
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Authors: | Juan Manuel Ruiz-Lozano Paola Bonfante |
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Institution: | (1) Dipartimento di Biologia Vegetale, Universitá di Torino and CSMT-CNR, Viale P.A. Mattioli, 25., 10125 Torino, Italia |
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Abstract: | This study investigates the effects of bacteria occurring in thecytoplasm of some arbuscular mycorrhizal fungi (AMF) on their symbioticefficiency. Gigaspora margarita, Gigasporarosea and Glomus versiforme, containing orwithout intracellular bacteria, were compared for their efficiency instimulating growth of Lactuca sativa L. Biomass productionand nutrient contents were evaluated in plants grown on two substrates. Theefficiency of G. margarita harbouring a homogenouspopulation of Burkholderia was greater than that of theother two AMF, mainly G. rosea, which does not containintracellular bacteria. When plants were grown in poor soil, inoculation withG. margarita resulted in the best growth rates as well asthe highest N, P and K values. The significantly higher N content is ofparticular importance, since the genome of Burkholderiapossesses nif genes. |
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Keywords: | Burkholderia sp Gigaspora margarita Intracellular bacteria Symbiotic efficiency |
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