Direct application of carbendazim and propiconazole at field rates to the external mycelium of three arbuscular mycorrhizal fungi species: effect on 32 P transport and succinate dehydrogenase activity

Mycorrhiza ◽  
1997 ◽  
Vol 7 (1) ◽  
pp. 33-37 ◽  
Author(s):  
M. Kling ◽  
Iver Jakobsen
Keyword(s):  
Arbuscular Mycorrhizal Fungi ◽  
Succinate Dehydrogenase ◽  
Dehydrogenase Activity ◽  
Mycorrhizal Fungi ◽  
Arbuscular Mycorrhizal ◽  
Direct Application ◽  
Succinate Dehydrogenase Activity ◽  
Species Effect ◽  
External Mycelium

scholarly journals Tolerance of arbuscular mycorrhizal fungi and microorganisms associated to their hyphosphere to aluminum in soil

2021 ◽  
Vol 51 ◽  
pp. e1304
Author(s):  
Yazmín Carreón-Abud ◽  
Mayra E. Gavito
Keyword(s):  
Fatty Acid ◽  
Arbuscular Mycorrhizal Fungi ◽  
Toxic Effect ◽  
Mycorrhizal Fungi ◽  
Soil Microorganisms ◽  
Arbuscular Mycorrhizal ◽  
Central Compartment ◽  
Gigaspora Margarita ◽  
Mycelium Growth ◽  
External Mycelium

Background: The elements that are toxic to arbuscular mycorrhizal fungi (AMF) and soil microorganisms, and the levels at which they affect them, are poorly known. Objective: To quantify the effects of: 1) aluminum added to the soil (0, 50 and 100 mg kg-1) and 2) inoculation with AMF (two isolates without prior exposure to aluminum, Acaulospora delicata and Gigaspora margarita, the native AMF community of a soil contaminated with Al, and a control without AMF) on the development of AMF mycelium and the hyphosphere-associated microbiota. Methods: A system with two compartments was used, a central compartment in which maize was sown and AMF were inoculated and a side compartment without root passage, where only the external mycelium was exposed to the different concentrations of Al. AMF external mycelium exposed to Al was quantified with the fatty-acid biomar-ker 16:1w5. Results and conclusions: Al concentrations up to 100 mg kg-1, controlling the pH of the soil, did not alter mycelium growth of any of the inoculated HMA either in the soil or in the roots. Aluminum added up to 100 mg kg-1 did not have a direct toxic effect on the growth of AMF mycelium and the hyphosphere-associated microbiota.

Phosphorus solubilization and pH changes as a result of the interactions between soil bacteria and arbuscular mycorrhizal fungi on a medium containing NO3-as nitrogen source

2002 ◽  
Vol 80 (5) ◽  
pp. 571-576 ◽  
Author(s):  
J Villegas ◽  
J A Fortin
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Arbuscular Mycorrhizal Fungi ◽  
Pseudomonas Putida ◽  
Mycorrhizal Fungi ◽  
Glomus Intraradices ◽  
Arbuscular Mycorrhizal ◽  
Serratia Plymuthica ◽  
Ph Changes ◽  
Phosphorus Solubilization ◽  
External Mycelium

The interactions between arbuscular mycorrhizal fungi and bacteria may affect the nutrient dynamics in the environment. To study these changes, assays were conducted in a two-compartment Petri plate system. A NO3--N medium containing an insoluble phosphate (P) source was used to evaluate the effect of Glomus intraradices (Schenck & Smith) external mycelium, mycorrhizal, and nonmycorrhizal transformed carrot roots (Daucus carrota L.), alone or in interaction with Pseudomonas aeruginosa (Schroeter) Migula, Pseudomonas putida (Trevisan) Migula, or Serratia plymuthica (Dyar) Bergey et al., on phosphorus solubilization and pH changes of the medium. In the NO3--containing medium, G. intraradices external mycelium as well as the three bacterial species studied were rather inefficient P solubilizers when growing individually. However, when G. intraradices external mycelium interacted with either P. aeruginosa or P. putida, the levels of soluble P in the medium significantly increased (P [Formula: see text] 0.05). These improvements were closely related to changes in the pH of the medium.Key words: Glomus intraradices, P solubilization, external mycelium, Pseudomonas aeruginosa, Pseudomonas putida, Serratia plymuthica.

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