Journal
ECOLOGY LETTERS
Volume 22, Issue 11, Pages 1757-1766Publisher
WILEY
DOI: 10.1111/ele.13353
Keywords
Biodiversity; competition; ecosystem function; functional traits; growth strategy; plant-microbe interactions
Categories
Funding
- Australian Plant Phenomics Facility
- Australian Research Council [DP140103936]
- National Collaborative Research Infrastructure Strategy (NCRIS) of the Australian Government
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Highly variable phenotypic responses in mycorrhizal plants challenge our functional understanding of plant-fungal mutualisms. Using non-invasive high-throughput phenotyping, we observed that arbuscular mycorrhizal (AM) fungi relieved phosphorus (P) limitation and enhanced growth of Brachypodium distachyon under P-limited conditions, while photosynthetic limitation under low nitrogen (N) was exacerbated by the fungus. However, these responses were strongly dependent on host genotype: only the faster growing genotype (Bd3-1) utilised P transferred from the fungus to achieve improved growth under P-limited conditions. Under low N, the slower growing genotype (Bd21) had a carbon and N surplus that was linked to a less negative growth response compared with the faster growing genotype. These responses were linked to the regulation of N : P stoichiometry, couples resource allocation to growth or luxury consumption in diverse plant lineages. Our results attest strongly to a mechanism in plants by which plant genotype-specific resource economics drive phenotypic outcomes during AM symbioses.
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