Article

Hyphal growth and mycorrhiza formation by the arbuscular mycorrhizal fungus Glomus claroideum BEG 23 is stimulated by humic substances.

Institute of Microbiology CAS, Division of Ecology, Prague, Czech Republic.
Mycorrhiza (impact factor: 2.63). 12/2005; 15(7):483-8. DOI:10.1007/s00572-005-0352-7
Source: PubMed

ABSTRACT Effects of humic substances (humic acid or fulvic soil extract) or saprophytic microorganisms (Paecilomyces lilacinus and an unidentified actinomycete) on growth of mycelium and mycorrhiza formation by Glomus claroideum BEG23 were studied in a hydroponic system. Humic substances stimulated root colonization and production of extraradical mycelium by the mycorrhizal fungus. Both humic and fulvic acids tended to decrease populations of culturable bacteria and fungi in the cultivation system, indicating a moderately antibiotic activity. The addition of saprophytic microorganisms able to use humic substances to the cultivation system further stimulated the development of the mycorrhizal fungus. However, stimulation of G. claroideum was also observed when the saprophytic microorganisms were heat-killed, suggesting that their effect was not linked to a specific action on humic substances. The results indicate that humic substances may represent a stimulatory component of the soil environment with respect to arbuscular mycorrhizal fungi.

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Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.

Keywords

arbuscular mycorrhizal fungi
 
colonization
 
culturable bacteria
 
extraradical mycelium
 
fulvic acids
 
Glomus claroideum BEG23
 
humic
 
humic acid
 
Humic substances
 
hydroponic system
 
moderately antibiotic activity
 
Paecilomyces lilacinus
 
saprophytic microorganisms
 
saprophytic microorganisms able
 
specific action
 
stimulation
 
stimulatory component
 
unidentified actinomycete
 
use humic substances
 

M Gryndler