What does the published scientific research say about Laccaria bicolor?

Laccaria bicolor (also described as Laccaria laccata var. bicolor Maire and Laccaria proxima var. bicolor) is an ectomycorrhizal (ECM) fungus with eight PubMed articles referencing it in a plant-input context. The peer-reviewed research covers phosphate mobilization, symbiosis signaling, and rhizosphere interactions — making it one of the better-studied ECM candidates in the scientific literature.

Field research cited in the literature shows that L. bicolor inoculation on Pinus massoniana seedlings grown in acidic soil enhanced available phosphorus depletion and mobilized inorganic phosphate and labile aluminum, with isolate S238A identified as a promising candidate for phytoremediation in southern China. Separate studies reported that L. bicolor robustly adapts to phosphate deficiency at developmental, transcriptional, and metabolic levels by upregulating phosphatase and phosphate-transport genes.

Research on symbiosis establishment has characterized lectin receptor-like kinase (PtLecRLK1) signaling in Populus trichocarpa as a key susceptibility factor permitting L. bicolor root colonization. However, one controlled study noted that L. bicolor caused growth inhibition in young poplars regardless of phosphorus availability — a species-specific result worth noting when evaluating this fungus as an input.

A Trichoderma compatibility study cited in the literature found that T. harzianum and T. atrobrunneum avoided mycoparasitic attack against L. bicolor, distinguishing it from plant-pathogenic fungi — a finding relevant to growers asking whether Laccaria bicolor is compatible with Trichoderma-based biocontrol programs.