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- W2779496089 abstract "Understanding how microbial DNA from root zone (rhizosphere) soil relates to key metabolicenzymes used by rhizosphere microbes was investigated using time series regression. We aimed to define theinfluence of these enzymes on DNA concentrations. This objective was achieved using phosphorescentmeasurement of both enzyme activities and DNA concentrations. Rhizosphere samples from three strains ofcanola genetically modified (GM) for herbicide resistance (HR) to atrazine, imidazolinone, and glyphosaterespectively together with the isoline to the transgenic glyphosate-resistant variety were grown in a greenhousein pH-neutral Vertisol soil. Analyses were carried out at days 7, 21, 42, and 56 growth representinggermination, early growth, maturity, and seed formation-senescence. Enzymes represented key soil microbialmetabolic processes and included leucine aminopeptidase (LAP), alkaline phosphatase (PHOS), cellobiosedehydrogenase (CELL), beta-glucosidase (BGL), and aryl sulphatase (SUL). The experiment employed arandomized complete block design with four blocks of eight pots, each pot containing two plants of identicalgenotype, and each cultivar randomly distributed within each block. Enzyme measurements were taken beforesubstrate addition and again after incubating at 25 degrees Celsius for one hour. DNA concentrations weremeasured using the Pico Green technique. Mean increases in enzyme activities for each lifespan stage werecorrelated with DNA concentrations using time series regression. A highly significant relationship (p = 0.001)between DNA concentration and beta-glucosidase activity emerged. No other enzyme significantly influencedDNA. The implications of this finding are that during times in the plant lifecycle when microbial-rootbiochemical interaction are increased (flowering and seed formation), the soil must have adequate SOMavailable to the microorganisms. It is now known that commensal relationships exist between rhizosphere soilmicroorganisms and the roots within that soil. The importance of microorganisms in breaking down decayingorganic material from plant residues is reflected in contemporary measurement of soil fertility whichrecognizes that a matrix of physical, chemical, and biological parameters together are required for an adequateassessment. This is because when organically-bound carbon biomass is subjected to transformation, othernutrients like Nitrogen (N), Phosphorus (P), and Sulphur (S) are released for mineralization by roots. Theresults reinforce the importance of soil organic matter (SOM) as a component of soil fertility and sustainablesoil health." @default.
- W2779496089 created "2018-01-05" @default.
- W2779496089 creator A5012101107 @default.
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- W2779496089 date "2017-12-03" @default.
- W2779496089 modified "2023-09-26" @default.
- W2779496089 title "Time series regression uncovers significant correlation between soil microbial DNA concentration and enzymatic glucose neo-generation" @default.
- W2779496089 doi "https://doi.org/10.36334/modsim.2017.a5.ives" @default.
- W2779496089 hasPublicationYear "2017" @default.
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