Abstract

Plant growth enhancement using plant beneficial bacteria has been viewed in the sustainable agriculture as an alternative to chemical fertilizers. Actinobacteria, among the group of important plant-associated bacteria, have been widely studied for its plant growth promotion activities. Actinobacteria are considered as a limelight among agriculturists for their beneficial aspects toward plants. They are naturally occurring spore-forming bacteria inhabiting the soil and known for their plant growth-promoting and biocontrol properties. The mechanisms behind these activities include nitrogen fixation, phosphate solubilization, siderophore production, and other attributes such as antifungal production of metabolites, phytohormones, and volatile organic compound. All these activities not only enhance the plant growth but also provide resistance in plants to withstand unfavorable conditions of the environment. Hence, this chapter emphasizes on the plant growth traits of actinobacteria and how far it was studied for enhanced growth and bio-fortification.

Highlights

  • IntroductionPlant growth-promoting (PGP) microbes (epiphytic, endophytic, and rhizospheric) are likely to enhance the growth and productivity of crop by increasing the nutrient content

  • Plant growth-promoting (PGP) microbes are likely to enhance the growth and productivity of crop by increasing the nutrient content

  • The use of plant growth microbes such as actinobacteria is a good choice as an alternative tool for sustainable agriculture

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Summary

Introduction

Plant growth-promoting (PGP) microbes (epiphytic, endophytic, and rhizospheric) are likely to enhance the growth and productivity of crop by increasing the nutrient content. These plant microbiomes have been sorted out from diverse sources belonging to all three domains: archaea, bacteria, and fungi. Plant growth-promoting rhizobacteria (PGPR) actinobacteria promote the plant growth through a variety of mechanisms including production of phytohormones, antibiotics, siderophore, volatile organic compound, and different hydrolytic enzymes.

Actinobacteria’s role in PGPR activity
Nitrogen fixation
Phosphorus solubilization
Siderophore production by actinobacteria
Production of hormone
Cell wall-degrading enzymes
Actinobacteria’s role as nutrient promoter
Actinobacteria in bioremediation of metals
Reduction of plant-pathogen stress by actinobacteria
Actinobacteria’s role against stress
Findings
Conclusion
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