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Effects of four types of sodium salt stress on plant growth and photosynthetic apparatus in sorghum leaves

Zhang, Hui-hui, Xu, Nan, Wu, Xuye, Wang, Junrui, Ma, Songliang, Li, Xin, Sun, Guangyu
Journal of plant interactions 2018 v.13 no.1 pp. 506-513
Sorghum (Poaceae), alkalinity, alkalinization, chlorophyll, leaves, photosystem II, plant growth, planting, reflectance, salt stress, sodium, sodium bicarbonate, sodium carbonate, sodium chloride, sodium sulfate
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 Na₂SO₄; and two alkaline salts, NaHCO₃ and Na₂CO₃), 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 Na₂CO₃ > NaHCO₃ > Na₂SO₄ > 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 Na₂CO₃.