Effect of salt stress on growth, electrolyte leakage, Na⁺ and K⁺ content in selected plant species

Abstract

This study monitors the effect of salt stress induced by a NaCl solution (0 – deionized water, 50, 100, 200, 300 mmol/L) in lettuce (Lactuca sativa L. cv. Orion), New Zealand spinach (Tetragonia tetragonoides (Pall) Kuntze) and common purslane (Portulaca oleracea L. cv. Green Purslane) over the course of 50 days. The diverse reactions of these monitored species to salt stress are well apparent from the results. Lettuce proved as the most sensitive to salt stress, showing a significant reduction of dry weight, where even lower concentrations of salt affected membrane stability through increased electrolyte leakage value and an imbalance in the content of Na<sup>+</sup> and K<sup>+</sup>, observed in the form of lower ratios of K<sup>+</sup>/Na<sup>+</sup>. In case of T. tetragonoides, lower salt concentrations positively affected growth and this species appears to particularly accumulate sodium. In case of P. oleracea no significant reduction of dry weight took place with the increasing concentration of NaCl and a naturally high content of potassium contributed to maintaining a favourable ratio of K<sup>+</sup>/Na<sup>+</sup> even at higher salt concentrations, which is one of the prerequisites of salt-stress tolerance.

Stomatal and Photosynthetic Traits Are Associated with Investigating Sodium Chloride Tolerance of Brassica napus L. Cultivars

“…In the present study, increases in EL were observed to be higher in the salt-sensitive cultivars than in the salt-tolerant cultivars. These findings are in good agreement with many researchers who found that salt stress enhanced EL in the salt-sensitive cultivars of rapeseed [59], japonica rice [60], or other salt-sensitive species [61].…”

Comparison of CAM expression, photochemistry and antioxidant responses in Sedum album and Portulaca oleracea under combined stress

“…CAM induction and yield loss parameters were differentaily affected by different levels of salt and drought stresses Though P. oleracea is already proved as moderately tolerant to salinity (Mulry et al 2015, Sdouga et al 2019, this is the first time we have observed that P. oleracea graded as moderately tolerant (MT = 21-50% reduction of dry mass) to 15 dS m −1 salinity. Indeed, P. oleracea naturally grows in arid and saline soils, which transition from C 4 to CAM contributes in the survival of this species (Hniličková et al 2019, Sdouga et al 2019. The nocturnal fluctuations of titratable acidity and malate Fig.…”

Assessment of changes in physiological and biochemical traits in four pistachio rootstocks under drought, salinity and drought + salinity stresses

“…EL from plasma membranes is suggested as one of the most significant selection indexes for determination of salt‐tolerant plants (Ashraf and Ali ). In line with the recent report in Lactuca sativa L. (Hniličková et al ), EL value elevated in all of the different rootstocks with induction of stress. Also, a high positive correlation was observed between these parameters and Cl − .…”