Mycorrhiza in cereal crops and other grasses: friend or foe?
Mette Grønlund (Keynote speaker)
Activity: Talks and presentations › Conference presentations
Efficient use of soil P is of major concern as a predicted exhaustion of P rock reserves coincides with the need for increased food production. Arbuscular mycorrhizas are universal and unavoidable in soil-grown plants and AM represents one important driver for enhancing efficiency in P acquisition. In many cases, AM increases plant growth dramatically, mainly because P uptake through the mycorrhizal pathway (MP) benefits from a dense mycelium extending into the soil. Nevertheless, there is a considerable functional diversity in the outcome of the symbiosis, ranging from positive to negative effects. In the case of zero or negative effects on growth, as seen more often than not in cereals and other grasses, it was conventionally assumed that the fungi played no role in nutrient uptake such that mutualism was turned into parasitism. This has proven to be wrong as P uptake through MP can be very active, even in no-benefit cases. Possible mechanisms behind AMF-induced growth depressions and possible strategies for preventing them will be discussed.
Place: Jyvaskyla, Finland