FIGURE 3.

The redundancy analysis (RDA) triplot of the 126 mature samples. Hellinger-transformed OTUs table, constrained by eight physical and chemical properties, including acidity (AC), reducing sugar (SU), moisture (MO), starch (ST), saccharification (SA), liquefaction (LI), protease activity (PA), and cellulase activity (CA). The labels of OTUs are composed of the first three letters of taxa and the last three number of OTUs original names, “un” means unclassified. As there are too many OTUs to present, only OTUs with (weighted) orthonormal species scores of RDA1 and RDA2 greater than 0.15 are plotted. “Mel” – Melghirimyces, “Bac” – Bacillus, “Bac_un” – Bacillales_unclassified, “Sta” – Staphylococcus, “Bre” – Brevibacterium, “Ral” – Ralstonia, “Wei” – Weissella, “Ach” – Achromobacter, “Ste” – Stenotrophomonas, “Lac” – Lactobacillus, and “Leu” – Leuconostoc. B0 to B5 stands for six batches of mature starters.