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Arbuscular mycorrhizal (AM) fungi are obligatory biotrophic symbionts living in the roots of most terrestrial plants. AM fungi (AMF) have a positive effect on plant growth and plant nutrition, especially under stress conditions.  The aim of the present study was to observe the relationship between the mycorrhizal dependency and nutrient uptake of host plants and the rate of AMF colonization in a pot experiment. The degree of host growth responses to AMF colonization is expressed as mycorrhizal dependency (MD).  The pot trial was set up with a sterilized calcareous chernozem soil from Nagyhörcsök (Hungary) in a growth chamber under controlled climatic conditions. Tomato (Lycopersicon esculentum L.) plants were inoculated with Glomus claroideum (BEG23) , Glomus fasciculatum (BEG53), Glomus geosporum (BEG11), Glomus mosseae (BEG12) strains and a Glomus mosseae AMF culture produced by authors. The dry biomass production, the micro- and macronutrient concentrations of the shoots and the parameters of the mycorrhizal infection were determined. Each AM fungi species or isolate caused different and distinct changes in host plant growth and nutrient uptake. The biomass production of tomato increased significantly in the presence of AM symbiosis. The mean values of MD, calculated from shoot dry matter, varied between 36% and 55%. Mycorrhizal inoculation improved the P, N and K uptake of tomato. The highest values for root colonization, frequency of infection or arbuscular richness were found in the root of tomato inoculated with the two Glomus mosseae strains. The highest MD and nutrient contents appeared in the shoot of tomato treated withour Glomus mosseae strain, which may indicate a stronger affinity (compatibility) between the symbiotic partners. The results confirmed that the selected AMF strains are applicable in sustainable horticulture.

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. Tawaraya , K. , 2003 . Arbuscular mycorrhizal dependency of different plant species and cultivars . Soil Science and Plant Nutrition. . 49 . 655 – 668

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Agrokémia és Talajtan
Authors: Tibor Szili-Kovács, Ágnes Bárány, Anna Füzy, Tünde Takács, Gergely Krett, Ramóna Kovács, and Andrea Borsodi

infection and mycorrhizal dependency of thirteen wheat cultivars . New Phytol 87 . 677 – 685 . Bárány , Á. , Szili-Kovács , T. , Krett , G. , Füzy

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Agrokémia és Talajtan
Authors: Kelemen Bettina, Füzy Anna, Cseresnyés Imre, Parádi István, Kovács Ramóna, Rajkai Kálmán, and Takács Tünde

arbuscular mycorrhizal status and functionality by electrical impedance and capacitance measurement . Acta Biologica Szegediensis . 58 . 55 – 59 . TAWARAYA , K ., 2003 . Arbuscular mycorrhizal dependency of different plant species and cultivars . Soil

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. 28. Plenchette , C. , Fortin , J. A. , Furlan , V. ( 1983 ) Growth responses of several plant species to mycorrhizae in a soil of moderate P-fertility: I. Mycorrhizal dependency under field

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