Facteurs limitants et aspects dynamiques de la mycorhization contrôlée de Fagus silvatica Lin. par Hebeloma crustuliniforme (Bull. ex Saint-Amans) Quél, sur tourbe fertilisée

Garbaye, Jean; Wilhelm, Marcin

doi:10.1051/forest:19850104

Cited by 8 publications

(2 citation statements)

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“…Uptake via the mycorrhizal pathway is of major importance for N and P nutrition of trees in temperate zones (Plassard and Dell, 2010;Chalot and Plassard, 2011). While fertilization with P often decreases mycorrhization in inoculation experiments (Garbaye and Wilhelm, 1985;Kazantseva et al, 2009), under field conditions, relationships between soil P availability and measures of mycorrhization or mycorrhizal P uptake are less clear and might differ seasonally (Yang et al, 2016;Spohn et al, 2018). In most studies on the effect of N availability, mycorrhizal colonization increased with decreasing N availability (e.g., Brunner and Brodbeck, 2001;Sun et al, 2010); however, under natural concentration gradients, higher colonization was also found at lower C:N ratios (Hawkins et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Plant Nutritional Status Explains the Modifying Effect of Provenance on the Response of Beech Sapling Root Traits to Differences in Soil Nutrient Supply

Meller¹,

Frossard²,

Spohn³

et al. 2020

Front. For. Glob. Change

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Forests dominated by beech (Fagus sylvatica L.) cover large parts of Europe where they occupy a broad ecological niche in terms of soil fertility. This indicates a large potential to adapt to different soil conditions over long time periods. Recent changes in tree mineral nutrition across Europe raise the question to what degree beech can acclimate to changing soil conditions in the short term. In this study, we aimed at assessing the plasticity of root traits and rhizosphere properties of young beech trees from populations that are adapted to either high or low nutrient supply, when growing in soils differing in their fertility. We sampled beech saplings from two forest sites of contrasting nutrient supply, most distinctly in terms of phosphorus. We grew them for 2 years in rhizoboxes in mineral soil either from their own site or from the other site. We assessed the influence of the factors "plant origin" and "current soil" on root traits and rhizosphere properties. Fine root traits related to growth (biomass, length), architecture (branching), and morphology (diameter) responded strongly to the factor "current soil." Provenance (factor "plant origin") modified the response. The modifying effect was consistent with an influence of the plant status in those nutrients, which were not in sufficient supply in the soil. An additional genotypic difference in the sensitivity of the beech saplings to different soil nutrient supply could not be excluded. Fine root parameters normalized for length, mass, or volume (root tip density and frequency, specific root length and area, and root tissue density) did not differ among the treatments. Differences in percentage of mycorrhizal root tips and rhizosphere parameters related to phosphorus mobilization potential (pH, abundance of organic acid anions, and phosphatase activity) were small and mainly determined by the "current soil." Provenance had only a minor modifying effect, possibly due to differences in the ability of the plants to transfer carbon compounds from the shoot to the root and the fungal partner. Our results indicate a high plasticity of young beech trees to adapt their root system to different soil nutrient supply, thereby also taking into account internal nutrient reserves.

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Section: Introductionmentioning

confidence: 99%

Plant Nutritional Status Explains the Modifying Effect of Provenance on the Response of Beech Sapling Root Traits to Differences in Soil Nutrient Supply

Meller¹,

Frossard²,

Spohn³

et al. 2020

Front. For. Glob. Change

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“…L'inclusion du mycélium dans l'alginate a pour intérêt de protéger les hyphes des dessèchements éventuels tout en maintenant leur viabilité et leur capacité infective à un niveau élevé jusqu'à la formation de racines réceptives à l'infection sur la plante inoculée. L'intérêt pratique de cette technique est accru lorsque les inoculations sont pratiquées au semis [9,21].…”

Section: Introductionunclassified

Ectomycorhization de Cedrus atlantica en conditions contr�l�es : efficacit� de deux formes d'inoculum myc�lien

2002

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Résumé -L'effet de la forme de l'inoculum (obtenu sur tourbe-vermiculite ou par inclusion dans l'alginate) de Tricholoma tridentinum var. cedretorum et Hebeloma sinapizans sur la mycorhization de semis du Cèdre de l'Atlas, cultivés sur un substrat minéral, a été expérimenté en conditions contrôlées. L'utilisation de mycélium de T. tridentinum développé sur tourbe-vermiculite permet d'obtenir des degrés de mycorhization supérieurs à ceux enregistrés en employant du mycélium du même champignon inclus dans l'alginate, un an après l'inoculation. Le résultat inverse a été obtenu avec H. sinapizans. Les pourcentages d'apex mycorhizés et les teneurs en mycélium viable des racines des plants inoculés par T. tridentinum ont été supérieurs à ceux des plants inoculés avec H. sinapizans. L'obtention de mycorhizes à l'aide d'inocula mycéliens, a été réalisée sur le Cèdre de l'Atlas dans des conditions contrôlées et reproductibles. L'inoculation des semis par du mycélium d'H. sinapizans cultivé sur substrat solide a stimulé la biomasse de leurs parties aériennes et racinaires alors que l'inoculum de T. tridentinum, produit sur le même substrat, n'a permis d'augmenter significativement que la biomasse des racines. L'inoculation des plants par du mycélium d'H. sinapizans inclus dans l'alginate n'a été bénéfique que pour la biomasse de leurs parties aériennes. Cedrus atlantica / Tricholoma tridentinum var. cedretorum / mycorhization / inoculum mycélien / ergostérolAbstract -Ectomycorrhization of Cedrus atlantica seedlings under controlled conditions: Efficiency of two forms of mycelial inocula. The effect of two mycelial inocula (mycelia grown in peat-vermiculite saturated by a nutritive medium, or entrapped into alginate) of two ectomycorrhizal species (Tricholoma tridentinum var. cedretorum and Hebeloma sinapizans) was tested, under controlled conditions, on the mycorrhization of Cedar seedlings grown on mineral substrate. One year after inoculation, the percentage of infected root tips and root ergosterol contents were higher with cedars inoculated using T. tridentinum peat-vermiculite inoculum than using alginate one. The opposite results were obtained with H. sinapizans. The degrees of mycorrhization of the seedlings inoculated with T. tridentinum were higher than those of the seedlings inoculated with H. sinapizans. The mycorrhization of Cedrus atlantica seedlings using mycelial inocula was thus performed under controlled conditions which may be reproducible. The consequences of the inoculation of seedlings on their shoot and/or root biomass vary with the inoculum form and fungal species.Cedrus atlantica / Tricholoma tridentinum var. cedretorum / mycorrhization / mycelial inocula / ergosterol

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Ektomykorrhiza

Meyer¹

1986

Progress in Botany

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Facteurs limitants et aspects dynamiques de la mycorhization contrôlée de Fagus silvatica Lin. par Hebeloma crustuliniforme (Bull. ex Saint-Amans) Quél, sur tourbe fertilisée

Cited by 8 publications

References 1 publication

Plant Nutritional Status Explains the Modifying Effect of Provenance on the Response of Beech Sapling Root Traits to Differences in Soil Nutrient Supply

Plant Nutritional Status Explains the Modifying Effect of Provenance on the Response of Beech Sapling Root Traits to Differences in Soil Nutrient Supply

Ectomycorhization de Cedrus atlantica en conditions contr�l�es : efficacit� de deux formes d'inoculum myc�lien

Ektomykorrhiza

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