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Granular calcite stimulates natural mycorrhization and growth of white spruce seedlings in peat-based substrates in forest nursery

Summary

Published in Microorganisms 8(7): 1088. https://doi.org/doi:10.3390/microorganisms8071088

The acidity of peat-based substrates used in forest nurseries limits seedling mineral nutrition and growth as well as the activity of microorganisms. To our knowledge, no study has yet evaluated the use of granular calcite as a covering material to increase pH, calcium and CO2 concentrations in the rhizosphere and ectomycorrhizal development. The objective is to compare different covering treatments on early colonization of the roots by ectomycorrhizal fungi, as well as the growth and calcium nutrition of white spruce seedlings in the forest nursery. Three treatments were used to cover the plant cavities (Silica (29 g/cavity; control treatment), Calcite (24 g/cavity) and calcite+ (31 g/cavity)) and were distributed randomly inside each of the five complete blocks of the experimental design. The results show that calcite stimulates natural mycorrhization. Seedlings grown with calcite have significant gains for several growth and physiological variables, and that the periphery of their root plugs are more colonized by the extramatrical phase of ectomycorrhizal fungi, thus improving root-plug cohesion. The authors discuss the operational scope of the results in relation to the tolerance of seedlings to environmental stress and the improvement of their quality, both in the nursery and in reforestation sites.

Sector(s): 

Forests

Categorie(s): 

Scientific Article

Theme(s): 

Forestry Research, Forests, Seeds and Forest Seedlings Production

Departmental author(s): 

Auger, Isabelle, Lamhamedi, Mohammed

Author(s)

LAMHAMEDI, Mohammed S., Mario RENAUD, Isabelle AUGER and J. André FORTIN

Year of publication :

2020

Format :

PDF

ISSN

2076-2607

Keywords :

croissance, ectomycorhize, nutrition minérale, physicochimie, pépinière forestière, production de semences et de plants, Picea glauca, article scientifique de la recherche forestière, seeds and forest seedlings production, ectomycorhizæ, forest nursery, growth, mineral nutrition, physicochemistry, forestry research scientific article

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