Plant samples and plant images were taken starting three daysprior to the beginning of the drought stress (Day 0), between 7 amand 9 am. The control plants were irrigated with 200 mL everyday both before and during the drought stress experiment. Thisquantity of water was previously determined to be optimal forplant growth in Southern Italy in April, when the experiment wasconducted. Drought stress was imposed by withholding irrigation.For those plants subjected to drought stress, irrigation was com-pletely suspended until the first symptoms of withering (at day 5of drought stress) when 50 mL of water was administered. Verifi-cation of drought stress was conducted with a plant leaf porometer(Decagon Devices SC-1). Confirmation of plant stress was obtainedwhen, on the fourth day of the drought stress experiment, stressed plants revealed a 5 fold lower level of water transpiration rate whencompared to regularly irrigated plants.