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Research Article Open access CC BY 4.0

Perspectives of Phosphate Solubilizing Microbes for Plant Growth Promotion, Especially Rice - A Review

Nilima Dash, Tushar Kanti Dangar

International Journal of Biochemistry Research & Review · pp. 1–16 · Published 9 Aug 2017

10.9734/IJBCRR/2017/34136

Abstract

Phosphorus (P) is the second (to nitrogen) important macronutrient, a constituent of the                        essential macromolecules like DNA, RNA, ATP, phospholipids etc., major repository of                          chemical energy and indispensable at all growth stages of plants including rice. The rice crop requires around 6.4 kg P2O5 (2.8 kg P) per ton of grain yield and at neutral pH, P availability is optimum. Phosphate solubilizing microbes viz. Bacillus, Pseudomonas, Azotobacter,                         Aspergillus spp. recycle the nutrients like N, P, C, K, S, Fe etc. and promote plant                                      growth and development. Different endophytes like Rhizobium, Azospirillum, Pseudomonas spp., epiphytes like Rhizobium, Pantoea spp., rhizospheric organisms like Bacillus, Pseudomonas, Erwinia spp. and entomopathogens viz. Beauveria, Metarhizium, Nomuraea spp.                             mineralize insoluble P for P accessibility to plants. Soil enzymes also solubilize organic phosphates to available forms. Oxidation of glucose to gluconic acid, production of organic and inorganic acids, ammonia, H2S, etc. are major mechanisms for acid production and P mineralization by                   microbes. So, phosphate solubilizing microbes would be important biofertilizers as they promote plant growth, improve soil health and protect plants from different pathogens without affecting the environment. This has led to formulation and commercialization of several P-solubilizing microbial biofertilizers.

Endophyte epiphyte Oryza sativa PGP phosphate rice

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