The measurement of the leaf surface temperature was performed using the testo 865-i thermal imager (Testo SE & Co., KGaA, Titisee-Neustadt, Germany). After watering, the potted plants were placed on a grid frame, and a thermal image was taken from above. The image was analyzed using testo IRSoft software (ver. 5.0.5628.36882, Testo).
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