Abstract: The floral scent of Lilium‘Siberia’at different flowering stages and different time points
of one day was collected using dynamic headspace collection method，and then the components and
released amount were identified by automated thermal desorption–gas chromatography/mass spectrometry
（ATD–GC/MS）technique. The results showed that the components of floral scent emitted from Lilium
‘Siberia’mainly involved seven compound categories including terpenoids，alcohols，aldehydes，
ketones，esters，aromatics and alkanes. The component number and released amount was low at early
opening stage，and gradually rose at middle opening stage，arriving at the peak at full opening stage，and
then dropped rapidly at wilting stage. It was found that 12，46，55，20 compounds were successively
emitted from Lilium‘Siberia’at these 4 flowering stages. Among these components，terpenoid compounds
showed the most number and highest released amount. In the diurnal variation of floral scent emitted from
Lilium‘Siberia’，the released amount and component number also showed the pattern of first increase and
then decrease from dawn to dusk during one day. The total released amount and component number arrived
at the peak at 15：00—16：00，and significantly decreased at 7：00—8：00 and 19：00—20：00. At 7 time
phases from 7：00 to 20：00，27，42，51，57，45，40，and 16 compounds were identified respectively，
among which terpenoid compounds had the most number and the highest released amount. Among the
floral scent components identified in Lilium‘Siberia’，the terpenoid compounds including linalool，
β-ocimene，β-myrcene may be the main components contributing to the flower aroma of Lilium‘Siberia’，
and the light intensity played a key role in the diurnal variation of floral scent.

Key words: Lilium, floral scent, released amount, flowering stage, diurnal variation