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Communication Dans Un Congrès Année : 2023

Are native phosphate-solubilizing bacteria a relevant alternative to mineral fertilizations for crops?

Résumé

Rapeseed is a crop of major importance, characterized by the need of large amounts of mineral fertilizers due to high nitrogen and phosphorus requirements. Improvement of the ecological balance of this crop using biointrants constitute a promising perspective to fit agroecological considerations. As bio-inoculants, Phosphate Solubilizing Bacteria (PSB) could enhance plant P uptake through remobilization of P in soil. Here, bacterial strains were isolated from several agricultural soils and screened for their PSB and PGPR potential (Amy et al., 2022a). In a greenhouse experiment, three in vitro-promising strains, isolated under rapeseed (Pnapus), pea (Ppea) and faba bean (Pfaba), were then tested on rapeseed growth, in combination with a gradient of P fertilization. Pnapus showed no interesting effect on plant growth, whereas Ppea could negatively impacted rapeseed development. On the contrary Pfaba enabled to sustain plant growth despite a halving of P input and to improve associated soil microbial community (Amy et al., 2022b). Relative abundance of several bacterial genera involved in the nitrogen and sulphur cycles were increased, sustaining plant access to nutrients. Thereafter, in a rhizotron experiment, Pfaba confirmed its PSB potential to interestingly solubilize recalcitrant P-complexed forms at the benefit of plant growth, but only with adequate level of N supply. N fertilization level seemed to constitute a key-factor of the success of PSB inoculation. Such knowledge could be helpful to ensure success of PSB inoculation in field.
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Dates et versions

hal-04372970 , version 1 (04-01-2024)

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  • HAL Id : hal-04372970 , version 1

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Charlotte Amy, Jean-Christophe Avice, Isabelle Trinsoutrot-Gattin, Karine Laval, Mélanie Bressan. Are native phosphate-solubilizing bacteria a relevant alternative to mineral fertilizations for crops?. Biostimulant World Congress, Nov 2023, Milano, Italy. ⟨hal-04372970⟩
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