Phosphorus (P) is one of the essential macronutrients making up about 0.2% of plant dry weight. At the same time, it is the most limiting macronutrient after nitrogen for plant growth. On occurrence of the abiotic stress, the availability and uptake of the phosphorus for the plants further decreases. There are diverse groups of the plant and soil associated microbes which possess the ability to release phosphates from sparingly soluble mineral phosphates. Thus, they play major roles in providing the plants with the phosphorus. P-solubilizing microbes have been isolated and reported from stressed environments which included diverse genera of Acinetobacter, Aspergillus, Bacillus, Penicillium, Pseudomonas, Streptomyces and Trichoderma. The use of the P-solubilizers as bioinoculant in agricultural systems is an important approach to circumvent the application of the harmful chemical fertilizers. The implementation of novel technologies is important for the development P-biofertilizers.
Key words: Abiotic stress, Biofertilizers, P-solubilization, Plant growth promotion
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