## 2 Results
### Analysis of the Key Genes Involved in Volatile Organic Compound (VOC) Biosynthetic Pathways
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**No.** & **Compounds** & **Molecular** & **RT 1** & \multicolumn{2}{c}{**Content (ug.gFW-h–1) 2 \(\pm\) SD 3**} \\ \cline{4-6}  & **Compounds** & **Formula** & **(min)** & **A.** _‘Mystral_’ & _A._ ‘Alabama’ \\ \hline \multicolumn{6}{c}{**monoterpenses**} \\ \hline
1 & Eucalypttol & C\({}_{10}\)H\({}_{8}\)O & 10.211 & 49.2 \(\pm\) 2.8 & - \\
2 & \(\alpha\), \(\alpha\)-4-trimethyl-3-Cyclohexene-1-methanol & C\({}_{10}\)H\({}_{8}\)O & 14.182 & 7.07 \(\pm\) 0.6 & - \\
3 & \(\beta\)-Pinene & C\({}_{10}\)H\({}_{16}\) & 8.62 & 1.313 \(\pm\) 0.4 & - \\
4 & \(\beta\)-Phellendrene & C\({}_{10}\)H\({}_{16}\) & 8.551 & 0.566 \(\pm\) 0.0 & - \\
5 & 1-methyl-4-(1-methylethylene)-cyclohexene & C\({}_{10}\)H\({}_{16}\) & 11.876 & 0.414 \(\pm\) 0.1 & - \\
6 & (\(\acute{E}\))-1,3,6-Octatriene, 3,7-dimethyl- & C\({}_{10}\)H\({}_{16}\) & 10.691 & 0.232 \(\pm\) 0.1 & - \\
7 & \(\alpha\)-Pinene & C\({}_{10}\)H\({}_{16}\) & 7.436 & 0.212 \(\pm\) 0.0 & - \\
8 & \(\beta\)-Mycene & C\({}_{10}\)H\({}_{16}\) & 9.026 & 0.202 \(\pm\) 0.1 & - \\
9 & 4-methyl-1-(1-methylethyl)-3-Cyclohexen-1-ol & C\({}_{12}\)H\({}_{8}\)O\({}_{2}\) & 14.474 & 0.152 \(\pm\) 0.2 & - \\
10 & \(cis\)-2-Cyclohexen-1-ol,2-methyl-5-(1-methylethenyl)-, acetate & C\({}_{12}\)H\({}_{8}\)O\({}_{2}\) & 18.874 & 0.121 \(\pm\) 0.0 & - \\
11 & \(\mathrm{Thuqene}\) & C\({}_{10}\)H\({}_{8}\)O & 12.711 & 0.061 \(\pm\) 0.0 & - \\
12 & 3-methyl-6-(1-methylethylene)-cyclohexene & C\({}_{10}\)H\({}_{16}\) & 13.592 & 0.051 \(\pm\) 0.0 & - \\
13 & 2,6-Octadienoic acid, 3,7-dimethyl-, methyl ester & C\({}_{11}\)H\({}_{8}\)O\({}_{2}\) & 18.49 & 0.03 \(\pm\) 0.0 & - \\ \hline \multicolumn{6}{c}{**sesequierpeen**} \\ \hline
14 & 1H-Cyclopropa[a]naphthalene,1a,2, & & & \\
14 & 3,3a,4,5,6,7-octahydro-1,1a,3a,7-tetramethyl & C\({}_{15}\)H\({}_{24}\) & 21.454 & 0.172 \(\pm\) 0.0 & - \\
15 & \(\gamma\)-Himachalene & C\({}_{15}\)H\({}_{24}\) & 22.576 & 0.121 \(\pm\) 0.0 & - \\ \hline \multicolumn{6}{c}{**phenylpropanol/benzenoids**} \\ \hline
16 & Acetic acid, phenylmethyl ester & C\({}_{4}\)H\({}_{10}\)O\({}_{2}\) & 14.19 & 19.835 \(\pm\) 1.5 & - \\
17 & Benzoic acid, methyl ester & C\({}_{11}\)H\({}_{2}\)O\({}_{2}\) & 12.059 & 3.848 \(\pm\) 0.5 & - \\
18 & Benzaldehyde & C\({}_{7}\)H\({}_{6}\)O & 8.242 & 0.212 \(\pm\) 0.1 & - \\
19 & 2-Propenoic acid, 3-phenyl-, methyl ester & C\({}_{16}\)H\({}_{4}\)O\({}_{2}\) & 20.07 & 0.131 \(\pm\) 0.0 & - \\
20 & & & & \\
21 & Butylated Hydroxytoluene & C\({}_{8}\)H\({}_{7}\)N\({}_{2}\) & 17.672 & 0.131 \(\pm\) 0.2 & - \\
22 & 1-ethyl2,4,5-trimethyl-, Benzene & C\({}_{11}\)H\({}_{16}\) & 18.227 & 0.081 \(\pm\) 0.0 & - \\ \hline \multicolumn{6}{c}{**Others**} \\ \hline
23 & Tetradecane & C\({}_{14}\)H\({}_{30}\) & 20.453 & 0.242 \(\pm\) 0.2 & 0.226 \(\pm\) 0.2 \\
24 & Heptadecane,2,6,10,14-tetramethyl & C\({}_{21}\)H\({}_{44}\) & 22.015 & 0.242 \(\pm\) 0.2 & 0.183\(\pm\) 0.2 \\
25 & Pentadecane & C\({}_{15}\)H\({}_{32}\) & 22.948 & 0.242 \(\pm\) 0.2 & 0.279\(\pm\) 0.2 \\
26 & 1,2-Benzenedicarboxylic acid, butyl 2-ethylhexyl ester & C\({}_{16}\)H\({}_{22}\)O\({}_{4}\) & 32.011 & 0.232 \(\pm\) 0.1 & - \\
27 & 2,6,10-trimethyl-Dodecane & C\({}_{15}\)H\({}_{32}\) & 19.852 & 0.11 \(\pm\) 0.0 & 0.082 \(\pm\) 0.0 \\
28 & Cyclohexassayalone, dodecamethyl- & C\({}_{12}\)H\({}_{30}\)O\({}_{5}\)Si\({}_{6}\) & 18.628 & 0.081 \(\pm\) 0.0 & 0.059 \(\pm\) 0.0 \\
29 & decamethyl-cyclopentasiloxane & C\({}_{10}\)H\({}_{30}\)O\({}_{5}\)Si\({}_{6}\) & 13.844 & 0.051 \(\pm\) 0.0 & - \\
30 & Tridecane & C\({}_{13}\)H\({}_{28}\) & 17.832 & 0.051 \(\pm\) 0.0 & - \\
31 & 10-Methylnhondecane & C\({}_{20}\)H\({}_{2}\) & 19.692 & 0.04 \(\pm\) 0.0 & - \\
32 & 2,6,11,15-tetramethyl-Hexadecane & C\({}_{20}\)H\({}_{2}\) & 26.415 & 0.04 \(\pm\) 0.0 & 0.054 \(\pm\) 0.0 \\
33 & 3,5-dimethyl-Undecane & C\({}_{13}\)H\({}_{28}\) & 26.518 & - & 0.055 \(\pm\) 0.0 \\
34 & Hexadecane & C\({}_{16}\)H\({}_{34}\) & 27.777 & - & 0.103 \(\pm\) 0.1 \\ \hline \multicolumn{6}{c}{**85.567**} \\ \hline \hline \end{tabular}  
* RT, retention time; 2 the mass of compound (ug-gFW–1 h–1) = mass of internal standard \(\times\) area under the peak of a compound/area under peak of internal standard/fresh weight of sample; 3 all data are presented as mean \(\pm\) standard error (\(n=3\)); 4 indicates not detected.  
\end{table}