Sorghum variety Longza 17 was used as the experimental organism in a study of the effects of different types of sodium salt (two neutral salts, NaCl and Na 2 SO 4 ; and two alkaline salts, NaHCO 3 and Na 2 CO 3), at an equivalent Na + concentration (100 mmol•L −1) on leaf growth parameters and PSII and PSI function by using the Fast Chlorophyll Fluorescence Induction Dynamics technique and 820 nm light reflectance curves. The results showed that at Na + concentration of 100 mmol•L −1 , different types of sodium salt stress significantly inhibited the growth of sorghum plants. Different types of sodium salt stress showed significant inhibition on the activities of PSII and PSI in sorghum leaves, the impact of different types of sodium salt on the activities of PSII and PSI in sorghum leaves was consistent, listed from greatest to least impact as Na 2 CO 3 > NaHCO 3 > Na 2 SO 4 > NaCl. The effects of alkaline salt stress on the growth and photosynthetic properties of sorghum were greater than those under the neutral salt stress, therefore, in addition to considering the impact of Na + concentration in the sorghum planting area, emphasis should also be given to the influence of the degree of alkalization, especially the higher alkalinity of Na 2 CO 3. Abbreviations: F v /F m : PSII maximum photochemical efficiency; PI total : the total performance index; PI ABS : the photosynthesis indices based on the absorption of light energy; △I/I o : the initial slope of the curve of 820 nm light reflection; RC/CS m : the number of the reactive centers per unit area.

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Tang & Baiyi An (2019) Increased CO 2 concentrations increasing water use efficiency and improvement PSII function of mulberry seedling leaves under drought stress,

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