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Sabine Ravnskov

Arbuscular mycorrhizal fungi modify nutrient allocation and composition in wheat (Triticum aestivum L.) subjected to heat-stress

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Aims
To evaluate the role of the AM symbiosis on nutrient allocation in Triticum aestivum L. cv. 1110 at different growth stages before and after heat-stress at anthesis.
Methods
Measurements of plant biomass and grain yield at anthesis, grain-filling and maturity; determination of macro- and micronutrient concentrations in aboveground biomass; evaluation of AM fungal structures in roots and assessment of light-use efficiency of plants.
Results
AM increased grain number in wheat under heat-stress, and altered nutrient allocation and tiller nutrient composition. Heat increased number of arbuscules in wheat root, whereas number of vesicles and total colonization were unaffected. Heat increased photosystem II yield and the electron transfer rate, whereas non-photochemical quenching decreased during the first 2 days of heat-stress.
Conclusions
Nutrient allocation and –composition in wheat grown under heat-stress were altered by AM symbiosis, which lowered the K/Ca ratio, whereas it was increased by heat-stress. The increased carbon availability in spikes at this developmental stage, related to the C sink strength of the AM symbiosis and its influence on source-sink relationships in the host-plant, resulted in increased number of grains in heat-stressed AM plants.
Original languageEnglish
JournalPlant and Soil
Volume408
Issue1
Pages (from-to)385-399
Number of pages15
ISSN0032-079X
DOIs
Publication statusPublished - Nov 2016

    Research areas

  • Arbuscular mycorrhiza, Grain number, Nutrient allocation, Light-use efficiency

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