PGPR bioinoculants for ameliorating biotic and abiotic stresses in crop production

摘要

Worldwide, salinity is one of the most important abiotic stresses that limit crop growth and productivity: Ion imbalance and hyperosmotic stress in plants caused by high concentrations of salt often lead to oxidative stress conditions for plants. Salinization may be due to natural causes, and is common in the hot and dry regions of the world, or it may be a consequence of inadequate irrigation management practices. Our study focused on evaluation of plant growth promoting rhizobacteria (PGPR) for induction of growth promotion and enhancement of tolerance to salt in wheat under pot conditions. The interaction between PGPR strain and wheat root morphology and architecture was studied. Some PGPR strains reduced total root length but enhanced root hair length. The mechanism of PGPR elicitation of growth promotion may involve the enhancement of root hair development and therefore increase nutrient and water uptake. Single and dual inoculations of PGPR strains showed variations in their effect to enhance the crops tolerance to salt. The bacterial consortium was effective for wheat plants as an acceptable and ecofriendly technology to improve plant performance and development.