Multifarious beneficial traits and plant growth promoting potential of Serratia marcescens KiSII and Enterobacter sp. RNF 267 isolated from the rhizosphere of coconut palms (Cocos nucifera L.)

Abstract

Two plant growth promoting bacteria designated as KiSII and RNF 267 isolated from the rhizosphere of coconut palms were identified as Serratia marcescens and Enterobacter sp. based on their phenotypic features, BIOLOG studies and 16S rRNA gene sequence analysis. Both bacteria exhibited phosphate solubilization, ammonification, and production of indole acetic acid, β-1, 3 glucanase activities and 1-aminocyclopropane-1-carboxylate-deaminase activity. They could also tolerate a range of pH conditions, low temperature and salinity (NaCl). In addition, S. marcescens KiSII exhibited N- fixation potential, chitinase activity, siderophore production and antibiotics production. Seed bacterization with these bacteria increased the growth parameters of test plants such as paddy and cowpea over uninoculated control in green house assay. In coconut seedlings, significant increase in growth and nutrient uptake accompanied with higher populations of plant beneficial microorganisms in their rhizospheres were recorded on inoculation with both the PGPRs. The present study clearly revealed that PGPRs can aid in production of healthy and vigorous seedlings of coconut palm which are hardy perennial crops. They offer a scope to be developed into novel PGPR based bioinoculants for production of elite seedlings that can benefit the coconut farming community and the coconut based ecology.

Whole Genome Sequencing and Analysis of Plant Growth Promoting Bacteria Isolated from the Rhizosphere of Plantation Crops Coconut, Cocoa and Arecanut

“…The isolates that gave best results in the in vitro testing were then studied for plant growth promotion using rice and cowpea seeds in environmental growth chamber and green house conditions [18], [19]. They were also then tested on coconut [16], cocoa [20] and arecanut [22] seedlings grown in polybags.…”

“…These plantation crops harbor plant-beneficial microorganisms in their rhizospheres [11]–[15] and some of these have been utilized for growth promotion [16]–[20] as they offer an opportunity for ecologically safe nutrient management [21]. In this study, we have performed deep sequencing analysis of three PGPRs, CPCRI-1, CPCRI-2 and CPCRI-3, isolated from coconut [16], cocoa [20] and arecanut [22] rhizosphere, respectively.…”

Describing Paenibacillus mucilaginosus strain N3 as an efficient plant growth promoting rhizobacteria (PGPR)

“…To portray any rhizobacterial strain as PGPR, it should be recognized to IAA production, phosphate solubilization, ammonia production, nitrogen fixation, and siderophore production, further, it is inevitable for strain to show plant growth promotion in vivo under pot trials (George, Gupta, Gopal, Thomas, & Thomas, 2013;Goswami et al, 2013). Our previous reports suggest that Pseudomonas spp.…”

Colonization of Trichoderma harzianum strain SQR-T037 on tomato roots and its relationship to plant growth, nutrient availability and soil microflora

“…Similarly, T. asperellum strain T203 increased cucumber root area, shoot length and leaf area, and T. harzianum strain T-22 solubilized MnO 2 , metallic zinc, and rock phosphate (Yedidia et al 2001;Altomare et al 1999). However, the relationship between plant growth promotion by Trichoderma and nutrient availability, as well as the role of microflora in rhizosphere, remain topics of ongoing investigation (Adesemoye et al 2009;George et al 2013). And the key factors involved in the plant growth promotion by Trichoderma are not as clear as biocontrol (Borrero et al 2004).…”