## 3 Results
### Discrimination of the Different Taxa Using GC-MS
#### 3.2.1 Identification and Comparison of the Volatile Compounds among the Different Taxa
\begin{table}
\begin{tabular}{l l l l l l l l l l} \hline
34 & 13.94 & Linaloci & 0.0015 [24] & 987 & 1098 & \(2.3\pm 0.32\)cc & \(19.94\pm 0.98\)A & \(3.04\pm 0.64\)Bb & \(1.49\pm 0.10\)Dd \\
35 & 19.38 & Limonene oxide & 0.011 [33] & 1068 & 1057 & – & \(0.25\pm 0.08\) & – & – \\
36 & 22.15 & Borsyl acetate & 0.075 [34] & 1199 & 1270 & – & – & \(0.38\pm 0.11\) & – \\ \hline \multicolumn{8}{c}{**Squipergeless**} \\ \hline
37 & 26.71 & 9-Element & ph & 1396 & 1336 & – & – & \(3.26\pm 0.06\)Aa & \(2.73\pm 0.43\)Aa \\
38 & 27.49 & a-Cdrere & 0.00003-0.00213 & 1404 & 1411 & \(1.76\pm 0.13\)Bb & \(0.68\pm 0.00\)Cc & \(19.51\pm 0.65\)Aa & \(19.13\pm 0.7\)Aa \\
39 & 27.82 & 9-Cdrere & 0.00003-0.00213 & 1408 & 1418 & \(0.69\pm 0.10\)Cc & \(0.34\pm 0.08\)Bb & \(7.99\pm 0.65\)Aa & \(6.61\pm 0.52\)Bb \\
40 & 28.26 & (Z)-Thiophene & na & 1413 & 1434 & \(0.69\pm 0.10\)Cc & \(1.52\pm 0.15\)A & \(1.37\pm 0.25\)A \\
41 & 29.75 & (+)-cliophene & na & 1429 & 1352 & – & – & \(0.47\pm 0.12\)Aa & \(0.44\pm 0.17\)Aa \\
42 & 30.16 & \(\varsigma\)Mutadiene & na & 1434 & 1476 & – & – & \(0.55\pm 0.14\)Ab & \(0.88\pm 0.10\)Aa \\
43 & 30.32 & a-Murobenzene & na & 14035 & 1491 & – & – & \(0.41\pm 0.10\)Ab & \(0.87\pm 0.20\)Aa \\
44 & 30.41 & Circumene & na & 1436 & 1346 & – & – & \(0.31\pm 0.10\) \\
45 & 30.53 & 9-Stilbene & na & 1438 & 1521 & – & – & \(0.47\pm 0.12\)Aa & \(0.69\pm 0.11\)Aa \\
46 & 30.9 & \(\gamma\)-Carylene & na & 1442 & 1409 & – & – & \(0.43\pm 0.14\)Aa & \(0.59\pm 0.07\)Aa \\
47 & 31.47 & \(\varsigma\)-Farnese & 2 [34] & 1448 & 1505 & – & \(0.25\pm 0.08\)Cc & \(0.60\pm 0.08\)Bb & \(1.19\pm 0.13\)Aa \\
48 & 32.65 & d-Cdre & na & 1454 & 1467 & – & – & \(0.52\pm 0.13\)Aa & \(0.79\pm 0.13\)Aa \\
49 & 35 & Cadirol & 0.00033-0.001 [35] & 1487 & 1597 & – & – & \(1.66\pm 0.32\)Bb & \(4.24\pm 0.10\)Aa \\ \hline \multicolumn{8}{c}{**Irregular terpen**} \\ \hline
50 & 3.09 & Methyl Isovelut ketone & 0.1–5 [24] & **-** & **-** & \(0.73\pm 0.13\) & – & – \\
51 & 14.75 & (E)-4-dimethyl-1,3-7-a-nontrine & na & 1049 & **-** & \(0.37\pm 0.08\)Bb & – & \(1.00\pm 0.16\)Aa \\
52 & 28.15 & a-clone & 0.001-0.006 [20] & 1312 & 1411 & \(1.30\pm 0.31\) & & – & – \\
53 & 28.44 & Geranylacetone & 0.06-0.06 [20] & 1316 & 1431 & \(2.43\pm 0.82\)Aa & \(0.36\pm 0.08\)Bb & \(0.38\pm 0.08\)Bb & \(0.31\pm 0.08\)Bb \\
54 & 30.53 & trans-s-clone & 0.001-0.006 [24] & 1339 & 1466 & \(0.38\pm 0.11\) & – & – & – \\ \hline \multicolumn{8}{c}{**N-containing compounds**} \\ \hline
55 & 5.5 & N-Baryaniline & na & 1054 & **-** & \(0.78\pm 0.16\) & – & – \\
56 & 22.41 & Inde & 0.5 [24] & 1416 & 1307 & – & \(1.15\pm 0.19\) & – & – \\
57 & 27.08 & 4-Hydrohydroline & na & 1357 & **-** & \(5.51\pm 0.54\)Bb & \(4.26\pm 0.40\)Cc & \(13.19\pm 0.49\)Aa & \(2.6\pm 0.43\)Dd \\
58 & 27.2 & 5-methyl-1,3-dihydro-2H-benzimidazole-2-one & na & 2021 & 23.76\(\pm 1.37\)Aa & \(16.41\pm 0.55\)b & – & – \\ \hline \multicolumn{8}{c}{**S-containing compounds**} \\ \hline
59 & 40.47 & Coauthorised & na & 1445 & **-** & \(0.27\pm 0.07\)Aa & \(0.44\pm 0.02\)Aa & \(0.16\pm 0.08\)Aa & \(0.22\pm 0.10\)Aa \\
60 & 40.72 & L.Metzhiothen & 750 [24] & **-** & \(0.44\pm 0.14\) & – & – & – \\ \hline \end{tabular} Note: ODT: odor detection threshold. All OOTs presented in this table constitute human olfactory thresholds in the air. “na” indicates that no ODT value was available in the references - indicates that the compound has not been detected. The different letters in each column represent significant differences at the 95-level. Different lower-case letters behind data indicate significant differences at \(\varphi<0.08\), and upper-case letters indicates significant differences at \(\varphi\leq 0.01\) between two by using Duncan’s test. The compound data of each taxon was expressed as the mean \(\pm\) SD of three samples. LRI (calc), linear temperature-programmed retention indices calculated, LRI (th), linear temperature-programmed retention indices reported in the literature [2–5–37] (LRI Database on the web. [[http://www.odour.org.uk/firincho.html](http://www.odour.org.uk/firincho.html)]([http://www.odour.org.uk/firincho.html](http://www.odour.org.uk/firincho.html))), indicates that the retention index of the compound could not be calculated (the standard series of n-alkness is not sufficient to calculate) or could not be retrieved.  
\end{table}