Integrated Mechanisms of Plant Disease Containment by Rhizospheric Bacteria: Unraveling the Signal Cross Talk Between Pl
Being the universal green factories on earth, plants harbor many microbes in the rhizosphere arena. Majority of such free-living microorganisms have a positive effect on plant, known as plant growth-promoting rhizobacteria (PGPR). The PGPR are the extensi
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Integrated Mechanisms of Plant Disease Containment by Rhizospheric Bacteria: Unraveling the Signal Cross Talk Between Plant and Fluorescent Pseudomonas Belur Satyan Kumudini, Nellickal Subramanyan Jayamohan, and Savita Veeranagouda Patil
Abstract
Being the universal green factories on earth, plants harbor many microbes in the rhizosphere arena. Majority of such free-living microorganisms have a positive effect on plant, known as plant growth-promoting rhizobacteria (PGPR). The PGPR are the extensively studied bacteria which elicit the plant probiotic traits and disease resistance through its competitive dominance in rhizosphere and production of secondary metabolites which act directly or indirectly on plant signaling mechanism. Bacillus and Pseudomonas are the major rhizobacterial members of PGPR group; both are known to exert direct and indirect means of growth promotion on host plant. Although Bacillus have an additional advantage of spore forming nature, majority of the biocontrol negotiators are made of vast Pseudomonas group. Pseudomonas beholds numerous qualities that enable them well suited to function as biocontrol and plant growth-promoting agents in agriculture. The direct mechanism is majorly by phosphate solubilization and release of major growth-promoting hormones. Indirect mechanisms of growth promotion are complex diverse mechanisms, which work individually or together, resulting in imparting probiotic traits. The present review portrays a broad updated understanding of principal mechanisms of Pseudomonas-induced probiotic traits associated with systemic resistance signaling. Keywords
PGPR • Fluorescent Pseudomonas • Growth promotion • Disease resistance
B.S. Kumudini (*) • N.S. Jayamohan • S.V. Patil Department of Biotechnology, Center for Post Graduate Studies, Jain University, Bangalore 560 011, India e-mail: [email protected]; [email protected] © Springer Nature Singapore Pte Ltd. 2017 V.S. Meena et al. (eds.), Agriculturally Important Microbes for Sustainable Agriculture, DOI 10.1007/978-981-10-5343-6_9
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Contents 9.1 I ntroduction..................................................................................................................... 264 9.2 P GPR in Disease Containment....................................................................................... 265 9.2.1 Pseudomonas: The Supreme Diverse Group....................................................... 266 9.2.2 Pseudomonas as Plant Growth-Promoting Agents.............................................. 268 9.2.3 Biofilm Formation and Bacterial Signal Cross Talk............................................ 272 9.3 Mechanism of Antibiosis................................................................................................ 276 9.4 Host Specific Signal Variations Associated with Microbial Priming.............................. 278 9.5 Conclusions..........................................................................................
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