Salt-tolerance screening in Limonium sinuatum varieties with different flower colors

Abstract

Limonium sinuatum, a member of Plumbaginaceae commonly known as sea lavender, is widely used as dried flower. Five L. sinuatum varieties with different flower colors (White, Blue, Pink, Yellow, and Purple) are found in saline regions and are widely cultivated in gardens. In the current study, we evaluated the salt tolerance of these varieties under 250 mmol/L NaCl (salt-tolerance threshold) treatment to identify the optimal variety suitable for planting in saline lands. After the measurement of the fresh weight (FW), dry weight (DW), contents of Na+, K+, Ca2+, Cl−, malondialdehyde (MDA), proline, soluble sugars, hydrogen peroxide (H2O2), relative water content, chlorophyll contents, net photosynthetic rate, and osmotic potential of whole plants, the salt-tolerance ability from strongest to weakest is identified as Pink, Yellow, Purple, White, and Blue. Photosynthetic rate was the most reliable and positive indicator of salt tolerance. The density of salt glands showed the greatest increase in Pink under NaCl treatment, indicating that Pink adapts to high-salt levels by enhancing salt gland formation. These results provide a theoretical basis for the large-scale planting of L. sinuatum in saline soils in the future.

Effects of Salinity Stress on Growth and Physiological Parameters and Related Gene Expression in Different Ecotypes of Sesuvium portulacastrum on Hainan Island

“…These results indicated that high salt stress inhibited the growth of S. portulacastrum and significantly reduced their biomass. These findings are consistent with the results from previous studies [56,57]. Plants face difficulties in absorbing water and may even experience dehydration when subjected to NaCl treatment due to the decreased water potential of the surrounding solution.…”

The transcriptional regulatory network of hormones and genes under salt stress in tomato plants (Solanum lycopersicum L.)

“…Earlier studies indicated that MDA could act as the main osmotic regulator and important maker of oxidant stress in plants under salt stress. Moreover, the increase in proline content could also be beneficial to improve the water retention capacity of cells under salt stress ( Xu et al., 2021 ; Zhang et al., 2022 ). When tomatoes were subjected to salt stress, large amounts of reactive oxygen species (ROS) was induced to generate ( Apel and Hirt, 2004 ; Waszczak et al., 2018 ), and the activity of SOD, POD, CAT and other ROS scavengers was accordingly increased to remove the excess ROS to maintain the redox equilibrium in the plant ( Figure 1 ).…”

Salinity Tolerance, Ion Accumulation Potential and Osmotic Adjustment In Vitro and In Planta of Different Armeria maritima Accessions from a Dry Coastal Meadow

“…Comparative studies of salinity tolerance have been performed recently involving a number of halophyte species from the same or similar habitats [ 14 , 15 ]. However, studies comparing different accessions or genotypes of a single halophyte species have been seldomly performed [ 16 , 17 , 18 ]. Recently, we performed a study involving a number of accessions of crop wild relative legume species Trifolium fragiferum and concluded that high intraspecies variability in morphological and physiological responses to salinity exist between geographically isolated populations [ 19 ].…”