While arbuscular mycorrhizal (AM) fungi are well known to increase plant phosphorus uptake, there is
mounting evidence that AM fungi are important for enhancing the uptake of other minerals. As most crops
are capable of forming AM symbioses, these fungi could have the potential to improve the nutritional
value of the food we eat. However, we do not yet know which other nutrients are affected by the AM
symbiosis, nor whether different AM fungal isolates differ in their ability to acquire nutrients for their
hosts. In two separate greenhouse experiments, we tested 5 fungal isolates for their contribution to
shoot concentration of 11 macro- and micronutrients in two plants and found that AM fungi influenced
nutrient concentrations for all nutrients examined. Allium was highly responsive to AM fungi and showed
increased foliar nutrient concentration when nutrients were abundant whereas Plantago did not respond
significantly to inoculation from AM fungi. Only plants grown with Glomus intraradices had universally
improved nutrient levels. Our study shows that the identity of AM fungi can influence many nutrients
besides phosphorus, but the magnitude and direction of this response is also affected by host plant
characteristics and soil nutrient status.
While arbuscular mycorrhizal (AM) fungi are well known to increase plant phosphorus uptake, there ismounting evidence that AM fungi are important for enhancing the uptake of other minerals. As most cropsare capable of forming AM symbioses, these fungi could have the potential to improve the nutritionalvalue of the food we eat. However, we do not yet know which other nutrients are affected by the AMsymbiosis, nor whether different AM fungal isolates differ in their ability to acquire nutrients for theirhosts. In two separate greenhouse experiments, we tested 5 fungal isolates for their contribution toshoot concentration of 11 macro- and micronutrients in two plants and found that AM fungi influencednutrient concentrations for all nutrients examined. Allium was highly responsive to AM fungi and showedincreased foliar nutrient concentration when nutrients were abundant whereas Plantago did not respondsignificantly to inoculation from AM fungi. Only plants grown with Glomus intraradices had universallyimproved nutrient levels. Our study shows that the identity of AM fungi can influence many nutrientsbesides phosphorus, but the magnitude and direction of this response is also affected by host plantcharacteristics and soil nutrient status.
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