Evaluation of thermogravimetric analysis as a rapid tool for the detection of rhizobacteria biostimulants used in precision agriculture
Date
2021-01-17
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Publisher
Open Science Publishers LLP
Abstract
Six-week-old root samples were evaluated using high resolution (maximum resolution [MaxRes]) thermogravimetric
analyses (TGA) of the cell wall compositions of Gram-positive (Bacillus mucilaginosus, Bacillus amyloliquefaciens,
and Bacillus subtilis) and Gram-negative (Burkholderia sp., Rahnella aquatilis strain H 2.6, and R. aquatilis strain
RC 2.5) root colonizing plant growth promoting rhizobacteria (PGPR) commercial inoculant strains (biostimulants)
applied to pot grown wheat plants. TGA discriminated the strains within the two types of rhizobacterial cohorts and
thus provided a rapid non-molecular means for the detection of PGPR inoculant biostimulants within hours of root
sampling. The latter was due to the greater degree of definition of TGA fingerprints of individual thermal weight
loss events occurring over a degradation range, and heightened the corresponding peak temperature divergences
within strains of either type of bacteria themselves for their unequivocal identification. Confirmation of biostimulant
rhizobacteria identity in concomitant root samples was achieved through either cultural methods or direct tissue
PCR molecular protocols within 5 days and 2 days of sampling, respectively. The results suggested that MaxRes
TGA could serve as a rapid, inexpensive stand-alone tool or as combinatorial utility alongside pyrolysis gas
chromatography mass spectra, and Fourier transform infrared analytics for the early detection of PGPR biostimulants
in precision farming
Description
Publication history: Accepted - 31 October 2020; Published online - 17 January 2021
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Keywords
Thermogravimetry, Fourier Transform Infra-Red (FTIR), Soil and plant rhizosphere, rhizobacteria, thermal degradation
Citation
Carmichael, E. and Rao, J.R. (2021) ‘Evaluation of thermogravimetric analysis as a rapid tool for the detection of rhizobacteria biostimulants used in precision agriculture’, Journal of Applied Biology & Biotechnology. Journal of Applied Pharmaceutical Science. doi:10.7324/jabb.2021.9102