Biofertilizers function as key player in sustainable agriculture by improving soil fertility, plant tolerance and crop productivity

Abstract

Current soil management strategies are mainly dependent on inorganic chemical-based fertilizers, which caused a serious threat to human health and environment. The exploitation of beneficial microbes as a biofertilizer has become paramount importance in agriculture sector for their potential role in food safety and sustainable crop production. The eco-friendly approaches inspire a wide range of application of plant growth promoting rhizobacteria (PGPRs), endo- and ectomycorrhizal fungi, cyanobacteria and many other useful microscopic organisms led to improved nutrient uptake, plant growth and plant tolerance to abiotic and biotic stress. The present review highlighted biofertilizers mediated crops functional traits such as plant growth and productivity, nutrient profile, plant defense and protection with special emphasis to its function to trigger various growth- and defense-related genes in signaling network of cellular pathways to cause cellular response and thereby crop improvement. The knowledge gained from the literature appraised herein will help us to understand the physiological bases of biofertlizers towards sustainable agriculture in reducing problems associated with the use of chemicals fertilizers.

Application of PGPR and Antagonist Fungi-based Biofungicide for White Rust Disease Control and Its Economyc Analysis in Chrysanthemum Production

“…According to several reports, PGPR might mediate plant growth promotion through the production of various substances by the alteration of the whole microbial community in rizhospere niche (de Souza, Ambrosini, & Passaglia, 2015). PGPR had direct mechanisms through facilitating nutrient uptake or increasing nutrient availability by nitrogen fixation, solubilization of nutrients, mineralization of organic compounds and production of phytohormones (Bhardwaj, Ansari, Sahoo, & Tuteja, 2014). PGPR supported plant growth also through production of siderophore (low molecular weight iron-chelating compound) (Rahmoune et al, 2017), of which the plant can take up iron in large number (Sujatha & Ammani, 2013) and phytohormone (Zahedi & Abbasi, 2015).…”

“…As biocontrol agents, the bacterium may act through various mechanisms, regardless of their effect on the promotion of plant growth, like auxin production (Miransari & Smith, 2014), ethylene levels decrement (Liu & Zhang, 2015) or nitrogen fixation in association with roots (Reed, Cleveland, & Townsend, 2011). It is about only 1 to 2 % of bacteria promote plant growth originated from the rhizosphere (Beneduzi, Ambrosini, & Passaglia, 2012). Bacteria from wide range of genera have been identified as PGPR, of which Bacillus sp.…”

“…The indirect effects of PGPR on plant growth include the defend mechanism against one or more phytopathogenic organisms. The mechanism is through producing antagonistic substances and/or by inducing resistance againts pathogens (Beneduzi, Ambrosini, & Passaglia, 2012). A particular PGPR may stimulate the regulation of plant growth and development by using any one, or more, of these mechanisms.…”

A novelAzotobacter vinellandii(SRIAz3) functions in salinity stress tolerance in rice

“…4 The eco-friendly approach encourages the use of PGPR to improve plant tolerance to salinity stress. 5 The beneficial PGPRs interactions in the rhizosphere decide plant health. 4 Azotobacter participates in diverse metabolic functions owing to capacity to produce vitamins and hormones themselves and promotes plant growth and development.…”

Plant Growth Promoting Rhizobacteria (PGPR): A Bioprotectant bioinoculant for Sustainable Agrobiology. A Review

“…This action enhances growth through the supply and availability of primary nutrients to the plant. Bhardwaj, et al, (2014) and Arora, et al, (2012) identified it role on atmospheric nitrogen fixation, mineralization of organic compounds and phytohormones synthesis. Biofertilizers are essential components of organic agriculture and are vital in maintaining long-term soil fertility and sustainability through the production of safe and healthy food.…”