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Poster De Conférence Année : 2018

Optimization of phosphorus availability in soil: impact of Phosphate-Solubilizing Microorganisms on rapeseed growth and nutrient use efficiency

Résumé

Phosphorus (P) is an essential element that is necessary for plant and soil microbial development and growth, but limiting because of its low availability and mobility in soil1. Phosphate, the only form that plants can absorb, is largely complexed in organomineral particles2. The pool of soil available P is mainly supplied from organic matter mineralization and dissolution of clay-P, Fe-P and Al-P complexes. Moreover, the majority of the applied inorganic P fertilizer in soil is not available to plants. This low availability is generally balanced by excessive addition of P fertilizers, leading to environmental problems3. Rapeseed, an oleoproteaginous crop of interest in France and Normandy, is characterized by high requirements in P and also nitrogen (N). This specific requirement is partially due to low nutrient use efficiency in this crop. During leaf senescence, incomplete proteolysis leads to low remobilization of endogenous nutrients. To promote access to poorly available nutrients, like P, rapeseed is likely to recruit soil microorganisms through root exudation4. These specific microorganisms called « PSM » (Phosphate-Solubilizing Microorganisms) can improve plant nutrition by increasing organic P mineralization or with efflux of molecules directly acting on complex P forms5. These microorganisms of interest represent a possible efficient alternative to mineral fertilization4. In this context, the aim of this work is to evaluate the agronomic effect of efficient biofertilizers composed of beneficial microorganisms on rapeseed growth. Besides agronomic performance, the objective is also to apprehend direct or indirect processes implicated in P and N uptake. More particularly, the impact of microbial consortium and individual PSM, isolated from rapeseed rhizosphere, will be evaluated on plant growth and microbial dynamics linked to P and N cycles. Indeed, known reciprocal synergy between P availability and N cycle functioning, little studied, and the strong link between P and N metabolisms highlights the interest to consider the nutritional interactions P x N to improve use efficiency of these two elements.
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hal-04374569 , version 1 (05-01-2024)

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  • HAL Id : hal-04374569 , version 1

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Charlotte Amy, Mélanie Bressan, Karine Laval, Jean-Christophe Avice. Optimization of phosphorus availability in soil: impact of Phosphate-Solubilizing Microorganisms on rapeseed growth and nutrient use efficiency. 6th International Symposium Phosphorus in Soils and Plants, Sep 2018, Leuven, Belgium. ⟨hal-04374569⟩
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