The use of plant growth-promoting rhizobacteria (PGPR) to improve root function and crop nutrient use efficiency

Description

Bacteria that colonize plant roots and promote plant growth and development, plant growth-promoting rhizobacteria (PGPR) can contribute to more sustainable intensification of agriculture while minimizing detrimental impacts associated with excessive fertilization. In this chapter we review recent research on the use of PGPR as biofertilizers to enhance root function and improve nutrient uptake. PGPR alter root architecture, root metabolism, nutrient use efficiency and enhance plant tolerance to abiotic stresses such as salinity and drought by a variety of mechanisms that are not yet well understood. Beneficial effects observed in the laboratory are not always seen consistently in the field due to varying environment and complex biotic interactions, limiting the widespread application of PGPR in agriculture. We highlight new research approaches that will facilitate our understanding of this complex community at the molecular level and from a holistic perspective. Applied research to facilitate registration and commercialization of biofertilizers is also considered.

Table of contents

1 Introduction 2 The effect of plant growth-promoting rhizobacteria on root function 3 The effect of plant growth-promoting rhizobacteria on plant mineral nutrition 4 Future trends in research 5 Conclusion 6 Where to look for further information 7 References