Abstract
Aims Afforestation of trace-element contaminated soils, notably with fast growing trees, has been demonstrated to be an attractive option for bioremediation due to the lower costs and dispersion of contaminants than conventional cleanup methods. Mycorrhizal fungi form symbiotic associations with plants, contributing to their tolerance towards toxic elements and actively participating to the biorestoration processes. The aim of this study was to deepen our understanding on the effects of mycorrhizal inoculation on plant development and fungal community at two trace-element contaminated sites (Pierrelaye and Fresnes-sur-Escaut, France) planted with poplar ( Populus trichocarpa x Populus maximowiczii ). Methods The 2 sites were divided into 4 replicated field blocks with a final plant density of 2200 tree h -1 . Half of the trees were inoculated with a commercial inoculum made of a mix of mycorrhizal species. The sites presented different physico-chemical characteristics (e.g., texture: sandy soil versus silty-loam soil and organic matter: 5.7% versus 3.4% for Pierrelaye and Fresnes-sur-Escaut, respectively) and various trace element contamination levels. Results After 7 years of plantation, inoculation showed a significant positive effect on poplar biomass production at the two sites. Fungal composition study demonstrated a predominance of the phylum Ascomycota at both sites, with a dominance of Geopora Arenicola and Mortierella elongata , and a higher proportion of ectomycorrhizal and endophytic fungi (with the highest values observed in Fresnes-sur-Escaut: 45% and 28% for ECM and endophytic fungi, respectively), well known for their capacity to have positive effects on plant development in stressful conditions. Furthermore, Pierrelaye site showed higher frequency (%) of mycorrhizal tips for ectomycorrhizal fungi (ECM) and higher intensity (%) of mycorrhizal root cortex colonization for arbuscular mycorrhizal fungi (AMF) than Fresnes-sur-Escaut site, which translates in a higher level of diversity. Conclusions Finally, this study demonstrated that this biofertilization approach could be recommended as an appropriate phytomanagement strategy, due to its capacity to significantly improve poplar productivity without any perturbations in soil mycobiomes.
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Claims 8
Claim · model-written summary
After 7 years, mycorrhizal inoculation had a significant positive effect on poplar biomass production at the two sites.
- Treatment
- inoculatione1
- Outcome
- poplar biomass productione1
- Direction
- positive effecte1
- Setting
- the two sitese1
PopulusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar”
e1“inoculation showed a significant positive effect on poplar biomass production at the two sites”
Claim · model-written summary
The fungal community was dominated by the phylum Ascomycota at both sites.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar”
e1“a predominance of the phylum Ascomycota at both sites”
Claim · model-written summary
Geopora Arenicola and Mortierella elongata dominated the fungal composition.
- Interactor
- Geopora Arenicola
Geopora arenicolae1other - Second interactor
- Mortierella elongata
Linnemannia elongatae1other - Outcome
- dominancee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar”
e1“a dominance of Geopora Arenicola and Mortierella elongata”
Claim · model-written summary
Ectomycorrhizal fungi made up a higher proportion, highest at Fresnes-sur-Escaut (45%).
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar”
e1“a higher proportion of ectomycorrhizal and endophytic fungi (with the highest values observed in Fresnes-sur-Escaut: 45% and 28% for ECM and endophytic fungi, respectively)”
Claim · model-written summary
Endophytic fungi made up a higher proportion, highest at Fresnes-sur-Escaut (28%).
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar”
e1“a higher proportion of ectomycorrhizal and endophytic fungi (with the highest values observed in Fresnes-sur-Escaut: 45% and 28% for ECM and endophytic fungi, respectively)”
Claim · model-written summary
Pierrelaye showed a higher frequency of mycorrhizal tips for ectomycorrhizal fungi than Fresnes-sur-Escaut.
- Outcome
- frequency (%) of mycorrhizal tips for ectomycorrhizal fungie1
- Direction
- highere1
- Comparator
- Fresnes-sur-Escaut sitee1
- Setting
- Pierrelaye sitee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar”
e1“Pierrelaye site showed higher frequency (%) of mycorrhizal tips for ectomycorrhizal fungi (ECM) and higher intensity (%) of mycorrhizal root cortex colonization for arbuscular mycorrhizal fungi (AMF) than Fresnes-sur-Escaut site”
Claim · model-written summary
Pierrelaye showed a higher intensity of mycorrhizal root cortex colonization for arbuscular mycorrhizal fungi than Fresnes-sur-Escaut.
- Outcome
- intensity (%) of mycorrhizal root cortex colonization for arbuscular mycorrhizal fungie1
- Direction
- highere1
- Comparator
- Fresnes-sur-Escaut sitee1
- Setting
- Pierrelaye sitee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar”
e1“Pierrelaye site showed higher frequency (%) of mycorrhizal tips for ectomycorrhizal fungi (ECM) and higher intensity (%) of mycorrhizal root cortex colonization for arbuscular mycorrhizal fungi (AMF) than Fresnes-sur-Escaut site”
Claim · model-written summary
The authors conclude that mycorrhizal biofertilization could be recommended as a phytomanagement strategy for poplar because it improves productivity without perturbing soil mycobiomes.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“this biofertilization approach could be recommended as an appropriate phytomanagement strategy, due to its capacity to significantly improve poplar productivity without any perturbations in soil mycobiomes”
The same questions in other papers
inoculation · yield · Populus (poplar)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.