Recording of Low-Oxygen Stress Response Using Chlorophyll Fluorescence Kinetics in Apple Fruit

Abstract Long-term storage of apples ( Malus x domestica , Borkh.) is increasingly taking place under Dynamic Controlled Atmosphere (DCA). The oxygen level lowered to ≤ 1 kPa O 2 and the are stored just above Lower Oxygen Limit (LOL). Low stress during controlled atmosphere can lead fermentation in if levels too low. Chlorophyll fluorescence be used detect low-oxygen at an early stage storage. currently available non-imaging systems often use minimal Fo ) parameter. In contrast, chlorophyll kinetics insufficiently described. Therefore, this study aimed gain more knowledge about response low using a imaging system. results show that kinetic curves differ aerobic conditions. fermentative conditions initiated decrease intensity upon application saturation pulses exposure actinic light. This result was made 18 °C ambient temperatures. Interestingly, curve changed before products accumulated apples. Non-photochemical quenching NPQ decreased dark phase after relaxation. Upon entering relaxation Kautsky induction, ɸPSII began increase. Under atmospheric conditions, reached values 0.81 0.76, while fermentation, ranged from 0.57 0.44.