Bacillus subtilis promotes plant phosphorus (P) acquisition through P solubilization and stimulation of root and root hair growth.

Autor: Jensen, Camilla Niketa Gadomska, Pang, Janet Ka Yan, Gottardi, Michele, Kračun, Stjepan Krešimir, Svendsen, Birgit Albrecht, Nielsen, Kristian Fog, Kovács, Ákos T., Moelbak, Lars, Fimognari, Lorenzo, Husted, Søren, Schulz, Alexander
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Zdroj: Physiologia Plantarum; May/Jun2024, Vol. 176 Issue 3, p1-13, 13p
Abstrakt: Bacteria can be applied as biofertilizers to improve crop growth in phosphorus (P)‐limited conditions. However, their mode of action in a soil environment is still elusive. We used the strain ALC_02 as a case study to elucidate how Bacillus subtilis affects dwarf tomato cultivated in soil‐filled rhizoboxes over time. ALC_02 improved plant P acquisition by increasing the size and P content of P‐limited plants. We assessed three possible mechanisms, namely root growth stimulation, root hair elongation, and solubilization of soil P. ALC_02 produced auxin, and inoculation with ALC_02 promoted root growth. ALC_02 promoted root hair elongation as the earliest observed response and colonized root hairs specifically. Root and root hair growth stimulation was associated with a subsequent increase in plant P content, indicating that a better soil exploration by the root system improved plant P acquisition. Furthermore, ALC_02 affected the plant‐available P content in sterilized soil differently over time and released P from native P pools in the soil. Collectively, ALC_02 exhibited all three mechanisms in a soil environment. To our knowledge, bacterial P biofertilizers have not been reported to colonize and elongate root hairs in the soil so far, and we propose that these traits contribute to the overall effect of ALC_02. The knowledge gained in this research can be applied in the future quest for bacterial P biofertilizers, where we recommend assessing all three parameters, not only root growth and P solubilization, but also root hair elongation. This will ultimately support the development of sustainable agricultural practices. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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