highly significantP < 0.01
Furthermore, Fisher’s exact probabilities test using these dichotomous variables revealed that the differences between groups were statistically significant ( P < 0.05) in KEGG categories “amino sugar and nucleotide sugar metabolism”, “carbon fixation pathways in prokaryotes”, and “nitrogen metabolism”, and were highly significant ( P < 0.01) in KEGG categories “pentose phosphate pathway”, “photosynthesis - antenna proteins”, “carbon fixation in photosynthetic organisms”, “sulfur metabolism”, “alanine, aspartate and glutamate metabolism”, “cysteine and methionine metabolism”, and “arginine biosynthesis.” Microbial secondary metabolites are compounds with diverse and sophisticated chemical structures, generally produced by certain restricted taxonomic groups.