Proliferation of mycorrhizal fungal species on organic matter improves nitrogen nutrition in Russian wild rye
Arbuscular mycorrhizal fungi (AMF) facilitate plant growth by aiding nutrient movement to plants especially under low fertility conditions. Arbuscular mycorrhizal fungi generally takes N as NH4+ or NO3-. We hypothesized that AMF enhance soil organic matter decomposition through their stimulating influence on soil microorganisms and help in the transport of nitrogen to plants. Hyphal chambers (HC) containing labelled 15N organic matter (wheat root and shoot) were inserted in pots. Russian wild rye was inoculated or not with three AM fungal species (G. intraradices, G. claroideum, G. clarum) and was grown for six months. The amount of total C retained in the HC was lower in the presence of AMF hyphae as compared to control and substrate C:N ratio was lower indicating that decomposition was faster in AMF colonized systems. The faster rate of decomposition in HC in presence of AMF was concurrent with change in microbial community structure. Higher N uptake and greater plant biomass were measured in AMF treated Russian wild rye as compared to control. Results of the present investigation suggest that presence of AMF hastens organic matter decomposition, thus enhancing soil N fertility and plant growth.
arbuscular mycorrhizal fungi
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