## 2 Results and Discussion
### Variation in Volatile Constituents from Nine Citrus Cultivars
\begin{table}
\begin{tabular}{l l c c c c c c c c c c c c c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**RI\({}^{*}\)**} & \multirow{2}{*}{**Compound name**} & \multicolumn{11}{c}{**Younge leaves**} & \multicolumn{11}{c}{**Mature leaves**} \\ \cline{3-14}  & & **FC\({}^{*}\)** & **PK\({}^{*}\)** & **ST** & **LBC** & **QJ** & **YHY** & **ZXY** & **HY** & **HSG** & **ERK** & **PK** & **ST** & **LBC** & **QJ** & **YHY** & **ZXY** & **HY** & **HSG** & **ERK** \\ \hline \hline
**Aldehydes** & & & & & & & & & & & & & & & & & & & & & & & & & & & \\
809 & Hexanal & A1 & M & M & M & M & 1.20 & 4.30 & M & M & M & M & M & M & M & 6.86 & 7.05 & 2.67 & M & M \\
815 & 2-hexanal & A2 & M & 1.31 & M & M & 7.15 & 13.64 & 1.74 & 1.17 & 1.20 & 2.21 & 1.37 & 2.63 & 1.25 & 14.29 & 14.60 & 7.83 & 2.23 & 1.72 \\
911 & Heptanal & A3 & / & / & / & / & / & / & / & / & / & / & / & / & / & / & / & T & / & / \\
921 & 2,4-hexanal, (E,P) *, & A4 & T & T & T & T & / & / & T & T & T & T & T & T & / & M & / & M & T & T \\
978 & Benzaldehyde * & A5 & / & / & / & T & / & / & / & T & T & / & / & / & / & / & / & / & / & / & / \\
1058 & Median * & A6 & / & / & / & / & / & / & / & / & / & / & / & / & / & / & / & / & / & / & / & T \\
1109 & Nominal & A7 & M & / & / & / & 7 & 3.00 & / & / & / & / & / & / & / & / & / & 2.51 & 7 & / & / \\
1210 & Decanal & A8 & T & T & T & T & T & T & T & T & T & M & M & M & T & T & M & / & M & M \\
1312 & Undecanal & A9 & / & / & / & / & / & / & / & / & / & T & / & / & / & / & / & / & T & M \\
**Monoterborne hydrocarbons** & & & & & & & & & & & & & & & & & & & & & & & & \\
922 & \(\alpha\)-thique & MH1 & 2.70 & M & 2.58 & 3.27 & M & M & M & 2.24 & T & 5.27 & M & 7.95 & 2.26 & M & M & 1.03 & 3.70 & / \\
945 & \(\alpha\)-pinene & MH2 & / & 1.32 & / & / & 2.56 & 1.96 & 2.24 & / & M & / & 1.33 & / & / & 2.10 & 3.11 & 2.56 & / & M \\
962 & camphene & MH3 & T & T & T & T & M & M & T & / & / & 7 & T & T & T & M & T & / & \\
992 & \(\beta\)-pinene & MH4 & / & 5.97 & / & / & 27.91 & 21.32 & 10.18 & 11.23 & 1.04 & / & 7.29 & / & / & 21.88 & 20.65 & 11.11 & 18.05 & 1.06 \\
993 & \(\beta\)-terpinene & MH5 & 14.38 & / & 15.18 & 15.36 & 4.04 & / & / & 1.65 & / & 21.83 & / & 30.55 & 13.64 & 5.70 & / & M & 3.38 & / \\
997 & \(\beta\)-nyreone & MH6 & 1.88 & M & 2.01 & 2.17 & / & M & 1.01 & / & 1.22 & 3.50 & M & 4.74 & 3.46 & / & 1.41 & M & / & 1.80 \\
1011 & \(\alpha\)-pbellandrene & MH7 & / & / & / & / & / & / & / & M & / & / & / & / & / & / & / & / & / & / \\
1013 & \(\beta\)-sterne & MH8 & / & / & 4.23 & 3.31 & / & / & / & 1.88 & / & / & & / & 8.51 & / & / & / & 5.87 & / \\
1019 & \(\alpha\)-terpinene & MH9 & M & M & M & M & M & M & M & M & / & 1.07 & M & 1.66 & M & M & M & M & M & / \\
1029 & \(p\)-cyrene & MH10 & / & 14.35 & / & / &  
\begin{table}
\begin{tabular}{l l c c c c c c c c c c c c c c c c c c c c c c c c} \hline \hline \multicolumn{13}{c}{**Rl \({}^{*}\)**} & \multicolumn{13}{c}{**Compound name**} & \multicolumn{13}{c}{**Young leaves**} & \multicolumn{13}{c}{**Mature leaves**} \\ \cline{3-13} \multicolumn{13}{c}{**Rl \({}^{*}\)**} & \multicolumn{1}{c}{**Compound name**} & \multicolumn{1}{c}{**FC \({}^{*}\)**} & \multicolumn{1}{c}{**PR \({}^{*}\)**} & \multicolumn{1}{c}{**ST**} & \multicolumn{1}{c}{**LBC**} & \multicolumn{1}{c}{**QJ**} & \multicolumn{1}{c}{**VHV**} & \multicolumn{1}{c}{**ZXY**} & \multicolumn{1}{c}{**HV**} & \multicolumn{1}{c}{**HSSG**} & \multicolumn{1}{c}{**ERK**} & \multicolumn{1}{c}{**PK**} & \multicolumn{1}{c}{**ST**} & \multicolumn{1}{c}{**LBC**} & \multicolumn{1}{c}{**QJ**} & \multicolumn{1}{c}{**YHV**} & \multicolumn{1}{c}{**ZXY**} & \multicolumn{1}{c}{**HY**} & \multicolumn{1}{c}{**HSSG**} & \multicolumn{1}{c}{**ERK**} \\ \hline
1066 & E-cimene & MH13 & 6.10 & 3.71 & 6.55 & 4.92 & 31.41 & 25.20 & 7.71 & 6.35 & 3.37 & 8.97 & 1.95 & 8.33 & 8.51 & 22.09 &