## 2 Results and Discussion
### Volatile Composition of Celery Samples
\begin{table}
\begin{tabular}{l l l l l l l l l l l} \hline \hline \multicolumn{1}{c}{**Code**} & \multicolumn{1}{c}{**Compound Name**} & \multicolumn{1}{c}{**LR1 [FOOTNOTE:1]Footnote 1: Linear function is also on B8 column. \({}^{h}\) A, mass spectrum and LR1 agree with those of authorless compounds. B, mass spectrum (spectral quality value \(\sim\) 60 was used) and LR1 figures with reference spectrum in the NIST/ EPA/NII mass spectra database and L1 agree with those in the literature cited. \({}^{h}\) & \multicolumn{1}{c}{**Relative Abundance (AU) [FOOTNOTE:1]Footnote 1: Linear function is also on B8 column. \({}^{h}\) A, mass spectrum and LR1 agree with those of authorless compounds. B, mass spectrum (spectral quality value \(\sim\) 60 was used) and LR1 figures with reference spectrum in the NIST/ EPA/NII mass spectra database and L1 agree with those in the literature cited. \({}^{h}\) & \multicolumn{1}{c}{**\(p\)-Value**} \\ \hline  & **Unknowns** & & & & & & & \\ U11 & unknown 1 & 840 & \(2.6\pm 0.79\) & rad & \(3.1\pm 0.71\) & \(2.0\pm 0.23\) & rad & \(4.5\pm 3.5\) & ns \\ U2 & unknown 2 & 1076 & \(\mathrm{nd}\) & \(\mathrm{s}^{\mathrm{b}}\pm 5.5\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) \\ U3 & unknown 3 & 1084 & \(15\pm 20^{\mathrm{a}}\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(2.7\pm 0.54\) & \(\mathrm{nd}\) & \(11\pm 33.3\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{ns}\) \\ U4 & unknown 4 & 1141 & \(2.2\pm 0.38\) & \(\mathrm{n}^{\mathrm{a}}\pm 0.98\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(0.30\pm 0.25\) & \(\mathrm{nd}\) & \(16.0\pm 0.35\) & \(\mathrm{nd}\) & \(14.0\pm 0.98\) & \(\mathrm{nd}\) \\ U5 & unknown 5 & 1189 & \(12.1\pm 17\) & \(0.62\pm 0.88\) & \(12.1\pm 17\) & \(0.5\pm 0.21\) & \(0.35\pm 0.49\) & rad & ns \\ U6 & unknown 6 & 1243 & \(2.4\pm 0.16\) & \(2.0\pm 11\) & \(0.93\pm 0.12\) & \(11.2\pm 0.23\) & \(2.0\pm 0.37\) & \(3.4\pm 1.3\) & ns \\ U7 & unknown 7 & 1276 & \(7.3\pm 15^{\mathrm{a}}\) & \(4.1\pm 21^{\mathrm{a}}\) & \(1.0\pm 0.29\) & \(\mathrm{nd}\) & \(0.66\pm 0.9\) & \(\mathrm{nd}\) & \(2.2\pm 0.88\) & \(\mathrm{s}\) & \(13.2\pm 0.7\) & \(\mathrm{s}\) \\ U8 & unknown 8 & 1450 & \(12.3\pm 38^{\mathrm{a}}\) & \(3.3\pm 0.53\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(2.0\pm 0.34\) & \(19.9\pm 0.48\) & \(4.3\pm 0.50\) & \(\mathrm{nd}\) & \(\mathrm{ns}\) \\ U9 & unknown 9 & 1543 & \(2.0\pm 17\) & \(0.38\pm 0.53\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(0.22\pm 0.31\) & \(0.36\pm 0.50\) & \(\mathrm{nd}\) & \(\mathrm{ns}\) & \(14.0\pm 0.91\) & \(\mathrm{nd}\) & \(\mathrm{ns}\) \\ U10 & unknown 10 & 1652 & \(5.5\pm 0.70\) & \(1.3\pm 0.35\) & \(\mathrm{s}\) & \(3.2\pm 0.62\) & \(1.2\pm 0.86\) & \(1.3\pm 0.31\) & \(1.7\pm 0.17\) & \(\mathrm{ns}\) \\ U11 & unknown 11 & 1710 & \(2.0\pm 0.50\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) \\ U12 & unknown 12 & 1758 & \(2.1\pm 12^{\mathrm{a}}\) & \(0.27\pm 0.20\) & \(\mathrm{b}\) & \(0.18\pm 0.06\) & \(\mathrm{b}\) & \(0.19\pm 0.08\) & \(0.87\pm 0.38\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{ns}\) \\ U13 & unknown 13 & 1842 & \(1.4\pm 0.07\) & \(0.69\pm 0.10\) & \(0.11\pm 0.16\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) & \(\mathrm{nd}\) \\ \hline \hline \end{tabular}
\end{table} 
Table 1: _Cont._Principal component analysis was used to visualise graphically the differences in the volatile composition of three parental genotypes and their hybrids and to examine any correlations occurring between genotypes (Figure 1). Using only the significant compounds according to the one-way ANOVA, a separation between genotypes was observed. Principal components one (PC1) and two (PC2) explained 69.79% of the total variation present within the data.