PMC

The factor loading plot for PLS regression model for IAA, SA, Kinetin and GA.

Prediction plot for the cross validation test (30% standard solution) of IAA, SA, Kinetin and GA as an external validation.

NIRS data spectra for IAA and GA and 13 different populations of Boswellia sacra. Samples are processed after 1^st derivative functions with Savitzky-Golay smoothing.

NIRS data spectra based PLS regression plot for IAA, SA, kinetin and GA with data inclusion for calibration set (70% standard solution).

NIRS data spectra for IAA, SA, Kinetin and GA and 13 different populations of B. sacra samples. The figure elucidates the scattering effect due to absorbance without preprocessing on wavelength range from 10000 to 4000 cm^-1.

Map of the Sultanate of Oman showing the sample collected from the hot-spot areas of B. sacra population. All the rhizospheric samples were collected from three different locations, with same climatic conditions. The map for sample collection was made in ArcGIS v9.3.1 (Redlands, CA, USA; http://www.esri.com/software/arcgis/eval-help/arcgis-931).

Phytohormonal quantification (IAA, SA, Kinetin and GA) throught advanced chromatographic and spectroscopic techniques such as LC-ESI-QTOF and GC-MS/SIM. The values are representative of three replications with standard error. One-Way ANOVA analysis were performed with repeated measures using Tukey test by GraphPad Prism 6.01v (USA). *** showed values are p<0.0001; ** showed values are p<0.001; * showed values are p<0.05.