Abstract
Millets produce particularly well under poor nutrient conditions, including under low phosphorous (P) soils. The use of phosphate fertilizers associated with inoculation with P-solubilizing microorganisms (PSM) has proved to be a technology that meets the precepts of ecological intensification of agriculture, both by reducing the use of synthetics in these environments and by adding beneficial microorganisms. PSM are able to convert complexed insoluble phosphates to soluble phosphate forms, which can easily be assimilated by plants, through production of organic acids, siderophores, protons, and hydroxyl ions. In general, the use of PSM can be optimized with the appropriate combination of strains, plant genotypes, and environmental conditions. In this chapter, we highlighted the potential use of PSM collected in different types of soil to increase P uptake and millet yield. In Brazil, we showed the release and use of an inoculant containing two bacterial strains, isolated from agricultural areas in the country, capable of increasing P use efficiency and crop yield. We also described that the co-inoculation of N-fixer and P-solubilizer microorganisms can have beneficial effects on germination, seedling vigor, plant height, seed weight, and grain yield of pearl millet under controlled conditions. Arbuscular mycorrhizal fungi (AMF) were also reported as a promising strategy for increasing yield as they can enhance P uptake in millet allowing higher soil exploration beyond the rhizosphere depletion zone. In addition, AMF can solubilize P present in the soil by different mechanisms, such as production of phosphatases, organic acids, siderophores, and protons. Overall, this chapter approached the need to expand studies focusing on the use of PSM in millet crops associated with the prospection and characterization of more efficient PSM. Moreover, we suggested that more field studies under different edaphoclimatic conditions and using different millet genotypes should be performed to understand the interactions between bioinoculants and native microorganisms.
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Gomes, E.A., de Sousa, S.M., de Paula Lana, U.G., dos Santos, F.C., Marriel, I.E., de Oliveira Paiva, C.A. (2023). Role of Phosphate Solubilizing Microbes on Phosphorous Availability and Yield Attributes of Millet. In: Pudake, R.N., Kumari, M., Sapkal, D.R., Sharma, A.K. (eds) Millet Rhizosphere . Rhizosphere Biology. Springer, Singapore. https://doi.org/10.1007/978-981-99-2166-9_9
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