Plausible Role of Plant Growth-Promoting Rhizobacteria in Future Climatic Scenario

Abstract

deterioration. Application of PGPR as bioinoculants can help in achieving the target of global agricultural productivity to feed the world's booming population, which is expected to become 9 billion by 2050. However, to be useful and effective bioinoculants, PGPR strains should be competent in their habitat, safe to the environment, helpful in plant nutrition and biocontrol, compatible with useful soil rhizobacteria, and tolerant to a variety of stress factors and show broad spectrum activity. In the context of the above scenario, this chapter focusses on the use of PGPR to increase agro-productivity and as one of the vital drivers of the agroeconomy. In this review we focus on the modes of action of PGPR and their role in environmental protection and agricultural sustainability under increasing climatic variations.

Recent Understanding of Soil Acidobacteria and Their Ecological Significance: A Critical Review

“…Plant root microbiome harbors beneficial microbes, which offer an eco-friendly alternative to improve plant growth and protect against phytopathogens (Bulgarelli et al, 2013;Philippot et al, 2013). Plant growth promoting rhizobacteria (PGPR) have been defined as free-living soil bacteria dwelling in the rhizosphere and endowed with the potential to stimulate plant growth and crop yield (Dutta and Podile, 2010;Sayyed et al, 2019;Zope et al, 2019). A plethora of reviews exhaustively documents almost all aspects of PGPR (Ahmad et al, 2008;Lugtenberg and Kamilova, 2009;Etesami et al, 2015;Parray et al, 2016;Backer et al, 2018).…”

“…They act directly by facilitating nitrogen absorption and assimilation, mineral solubilization, production of phytohormones (Ahmad et al, 2008;Parray et al, 2016;Shaikh et al, 2018;Kalam et al, 2020). Indirectly, PGPR, through their biocontrol mechanisms, produce siderophores (Wani et al, 2016;Sayyed et al, 2019), lytic enzymes (Jadhav et al, 2020a,b), antibiotics (Vinay et al, 2016;Reshma et al, 2018;Kenawy et al, 2019), 1-aminocyclopropane-1carboxylic acid (ACC) (Glick, 2014;Goswami et al, 2016;Sagar et al, 2020), guarding host plants against pathogens (Shaikh et al, 2018).…”

Production, Purification, and Characterization of Bacillibactin Siderophore of Bacillus subtilis and Its Application for Improvement in Plant Growth and Oil Content in Sesame

“…Sustainable measures are being explored to improve the quality and quantity of edible oil for human consumption. The utilization of multifarious plant-growthpromoting rhizobacteria (PGPR) as biofertilizers is increasingly being reported as one of the best practices of complementing conventional agrochemical inputs in agricultural systems [2][3][4]. These PGPRs promote plant growth by facilitating nutrient and nitrogen fixation [5,6], providing plant hormones such as including indole acetic acid (IAA) etc., phosphate solubilization [7,8] and iron nutrition through siderophore.…”

A Mixture of Piper Leaves Extracts and Rhizobacteria for Sustainable Plant Growth Promotion and Bio-Control of Blast Pathogen of Organic Bali Rice

“…Among the various strategies applied to manage rice blast so far, a combination of leaves extracts of piper and plant growth-promoting rhizobacteria (PGPR), such as Azotobacter, Rhizobium, Bradyrhizobium, Sinorhizobium, Azorhizobium, Mesorhizobium, Allorhizobium, Azospirillum, Pseudomonas, Alcaligenes, Enterobacter, Stenotrophmonas, Acetobacter, Klebsiella, Xanthomonas, Erwinia, Caulobacter, Serratia, Arthrobacter, Micrococcus, Burkholderia, Flavobacterium, Chromobacterium, Agrobacterium, Hyphomicrobium, and Bacillus sp., etc., appears as a cost-effective, sustainable, and organic method [17]. It offers numerous advantages over chemical fungicides [18][19][20][21][22] as they are eco-friendly, biodegradable in nature, and safe to the environment, human health, and useful soil rhizobia [19].…”

“…The secondary metabolites of piper inhibit the growth of plant pathogens by lysis of the cell wall, breaking of the peptide, glycosidic, etc. bonds, altering their metabolism through competition for nutrients and niches [21,22,[31][32][33][34][35].…”