Physiological and Photosynthetic Fluorescence Responses of Hami Melon Seedlings to Low Temperature Stress
The experiment was conducted to study the effect of low temperature on the physiological and photosynthetic changes of Hami melon.In this study,the low-temperature tolerant variety'Bishkezi'was selected as the test material.The contents of chlorophyll,soluble sugar,soluble protein,free proline,the activities of SOD and POD enzymes,photosynthetic rate and chlorophyll fluorescence of the second true leaves of Hami melon seedlings were determined under 4 ℃ low temperature.The results showed that the electrical conductivity,soluble sugar,soluble protein,and free proline content increased with the increase of low temperature treatment time;the activities of SOD enzyme was first decreased and then increased,and POD activity increased gradually.The contents of Chl,Chla and Chlb increased initially,then decreased and followed by an increase.Gs was first decreased and then increased;intercellular CO2 concentration increased,stomatal limitation value decreased,Fm,Fv/Fm,Fv/Fo decreased significantly,Fo and Fv increased and then decreased.In addition,with the increase of low temperature treatment time,the antioxidant capacity and osmoregulation capacity Hami melon cold-resistant va-rieties were enhanced,photosynthesis was weakened,intercellular CO2 concentration increased,and chlorophyll fluorescence decreased.The results of this study provide a theoretical basis for the selection and breeding of cold-resistant varieties of Hami melon.
Hami melonLow temperature stressPhysiological responsePhotosynthetic fluorescence cha-racteristics
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