We employed portable photosynthesis dectector and chlorophyll fluorometer to address the impacts of different concentrations of NaCl stress on photosynthesis and PSII photochemical activity of peppermint. Results show that concentration-dependent variation exhibits for the growth and biomass of peppermint under NaCl stress. Peppermint can normally grow under 100 and 150 mmol /L NaCl stress. Photosynthesis and PSII photochemical activity of peppermint are significantly decrease and electron transfer between QAand QBis inhibited with the increase of NaCl concentration. The impact of photosynthesis on plant growth and metabolism is quite significant under NaCl stress. PSII is the most sensitive component in a photosynthetic system,and so important in the response of photoynthesis to environmental stress.
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