## 2 Materials and Methods
### Extraction and Analysis of Volatile Organic Compounds
\begin{table}
\begin{tabular}{l l l l l} \hline \hline \multicolumn{1}{c}{**Code**} & \multicolumn{1}{c}{**Location**} & \multicolumn{1}{c}{**Province**} & \multicolumn{3}{c}{**Coordinates**} \\ \cline{2-5}  & & & **Latitude** & **Longitude** \\ \hline DER089 & Cabanes & Castellón & \(40^{\circ}11^{\prime}06^{\prime\prime}\) N & \(0^{\circ}10^{\prime}17^{\prime\prime}\) E \\ DER096 & Puebla-Tornesa & Castellón & \(40^{\circ}05^{\prime}26^{\prime\prime}\) N & \(0^{\circ}00^{\prime}19^{\prime\prime}\) W \\ DER087 & Benicásim & Castellón & \(40^{\circ}024^{\prime\prime}\) N & \(0^{\circ}03^{\prime}19^{\prime\prime}\) E \\ DER069 & Aras de los Olmos & Valencia & \(39^{\circ}512^{\prime\prime}\) N & \(1^{\circ}07^{\prime}04^{\prime\prime}\) W \\ DER082 & Chilches & Castellón & \(39^{\circ}46^{\prime}48^{\prime\prime}\) N & \(0^{\circ}11^{\prime}06^{\prime\prime}\) W \\ DER068 & Tuejar & Valencia & \(39^{\circ}46^{\prime}31^{\prime\prime}\) N & \(1^{\circ}02^{\prime}23^{\prime\prime}\) W \\ DER071 & Albalat dels Tarongers & Valencia & \(39^{\circ}41^{\prime}60^{\prime\prime}\) N & \(0^{\circ}20^{\prime}01^{\prime\prime}\) W \\ DER064 & Casinos & Valencia & \(39^{\circ}41^{\prime}49^{\prime\prime}\) N & \(0^{\circ}42^{\prime}49^{\prime\prime}\) W \\ DER067 & Losa del Obispo & Valencia & \(39^{\circ}41^{\prime}48^{\prime\prime}\) N & \(0^{\circ}53^{\prime}18^{\prime\prime}\) W \\ DER062 & Liria & Valencia & \(39^{\circ}39^{\prime}06^{\prime\prime}\) N & \(0^{\circ}34^{\prime}27^{\prime\prime}\) W \\ DER102 & Puzol & Valencia & \(39^{\circ}36^{\prime}38^{\prime\prime}\) N & \(0^{\circ}17^{\prime}53^{\prime\prime}\) W \\ DER061 & La Eliana & Valencia & \(39^{\circ}32^{\prime}59^{\prime\prime}\) N & \(0^{\circ}3118^{\prime\prime}\) W \\ DER060 & Paterna & Valencia & \(39^{\circ}32^{\prime}13^{\prime\prime}\) N & \(0^{\circ}26^{\prime}54^{\prime\prime}\) W \\ DER103 & Pueblo Nuevo & Valencia & \(39^{\circ}31^{\prime}19^{\prime\prime}\) N & \(0^{\circ}23^{\prime}17^{\prime\prime}\) W \\ DER056 & Pueblo Nuevo & Valencia & \(39^{\circ}30^{\prime}39^{\prime\prime}\) N & \(0^{\circ}22^{\prime}57^{\prime\prime}\) W \\ DER057 & Valencia & Valencia & \(39^{\circ}29^{\prime}04^{\prime\prime}\) N & \(0^{\circ}24^{\prime}19^{\prime\prime}\) W \\ DER052 & Sollana & Valencia & \(39^{\circ}16^{\prime}18^{\prime\prime}\) N & \(0^{\circ}22^{\prime}55^{\prime\prime}\) W \\ DER039 & Játiva & Valencia & \(38^{\circ}58^{\prime}41^{\prime\prime}\) N & \(0^{\circ}30^{\prime}53^{\prime\prime}\) W \\ DER040 & Bellus & Valencia & \(38^{\circ}56^{\prime}38^{\prime\prime}\) N & \(0^{\circ}29^{\prime}23^{\prime\prime}\) W \\ DER006 & Oliva & Valencia & \(38^{\circ}54^{\prime}42^{\prime\prime}\) N & \(0^{\circ}06^{\prime}49^{\prime\prime}\) W \\ DER008 & Javea & Alicante & \(38^{\circ}47^{\prime}35^{\prime\prime}\) N & \(0^{\circ}06^{\prime}41^{\prime\prime}\) E \\ DER045 & Jjona & Alicante & \(38^{\circ}38^{\prime}30^{\prime\prime}\) N & \(0^{\circ}28^{\prime}37^{\prime\prime}\) W \\ DER021 & Aspe & Alicante & \(38^{\circ}18^{\prime}33^{\prime\prime}\) N & \(0^{\circ}47^{\prime}35^{\prime\prime}\) W \\ DER014 & Santa Pola & Alicante & \(38^{\circ}14^{\prime}36^{\prime\prime}\) N & \(0^{\circ}32^{\prime}17^{\prime\prime}\) W \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Geographical origin of the wild populations where the seeds were collected. identification was established by comparing the obtained mass spectra with the NIST 2005 Mass Spectral Library, and also by comparing the GC retention times, mass spectra and estimated retention indices in our customized library [21]. As identification was tentative, only those compounds scoring above 80% match with the identified NIST mass spectra were considered to be positive identification [22]. Finally, the levels of VOCs were semi-quantified based on the integration of GC peak areas from the total ion current chromatograms [20; 21].