Cadmium accumulation and buffering of cadmium-induced stress by arbuscular mycorrhiza in three Pisum sativum L. genotypes
Level 5 - mechanism / opinion, no new human data
Level 5 by design analogy (controlled laboratory plant pot experiment; non-human/bench research)
OpenAlex W2133758091 · doi:10.1093/jexbot/53.371.1177
What was done
Three genotypes of pea (Pisum sativum L.: cv. Frisson, VIR4788, VIR7128) were grown in soil/sand pot cultures in the presence or absence of 2–3 mg kg⁻¹ bioavailable cadmium (Cd), with or without inoculation by the arbuscular mycorrhizal fungus Glomus intraradices. The researchers assessed shoot, root, and pod biomass, photosystem II activity via chlorophyll a fluorescence, total phosphorus concentrations, tissue-specific Cd accumulation, and cellular Cd sequestration in roots using energy-dispersive X-ray spectroscopy with scanning electron microscopy (EDS/SEM).
What was found
Cd decreased shoot, root, and pod biomass in non-mycorrhizal plants. Mycorrhizal inoculation attenuated these effects so that shoot biomass and photosystem II activity were not significantly different between Cd-treated and untreated mycorrhizal plants. Total phosphorus concentrations were not significantly different between mycorrhizal and non-mycorrhizal plants treated with Cd. Root Cd accumulation was 20- to 50-fold higher than shoot accumulation across Cd-treated plants. Tissue partitioning varied by genotype: VIR4788 had the lowest root Cd, while VIR4788 and VIR7128 had the lowest pod concentrations. Inoculation reduced root and pod Cd in cv. Frisson, maintained high root and pod Cd in VIR7128, and increased shoot Cd in cv. Frisson and VIR4788. Mycorrhizal colonization also decreased cellular root sequestration in cv. Frisson and VIR7128. Exact numerical values for biomass, fluorescence, and concentrations were not reported in the abstract.
Why it matters
This study demonstrates that mycorrhizal fungi can mitigate heavy metal toxicity in legumes without necessarily blocking metal uptake, and that the protective and accumulation effects depend strongly on the host plant genotype.
Limits
The study was conducted in controlled pot cultures rather than field conditions, used a single fungal strain and Cd concentration range, and does not report sample sizes, replicate numbers, or absolute numeric measurements in the abstract.
Cited by
- supports Pea and hemp plants act as bioaccumulators that pull heavy metals from the soil, and hemp is planted specifically for soil phytoremediation.