Role of the Plasma Membrane in Saline Conditions: Lipids and Proteins

Abstract

The PM is believed to be one facet of the cellular mechanisms involved in adaptation to saline conditions. Alterations in the PM components in response to salinity are therefore anticipated to contribute to plant salt tolerance. The review provides a comprehensive overview of the recent findings describing the crucial roles of the PM components in plant acclimation to salt stress. The responses of the PM proteins and lipids to salinity in contrasting species/cultivars were therefore discussed. The relationship between alterations in the lipids and proteins of the PM and tolerance to salt stress is also addressed. Several lines of evidence were presented demonstrating correlation of modifying the PM composition with adaptation of plants to high salinity. Even if contradictory results have been observed, the roles of the PM lipids and proteins appeared to be of great importance for tolerance to high salinity. Despite the promising results, more research should be carried out at the molecular level to further evaluate the roles of some of the PM components in salt tolerance.

Insights Into Oxidized Lipid Modification in Barley Roots as an Adaptation Mechanism to Salinity Stress

“…Our results in the present study show that all four barley varieties increased the levels of linolenic acid (18:3)containing diacyl-GP species, thereby increasing membrane fluidity in response to salinity. These results are in accordance with previous studies that show that the ability to maintain or increase unsaturated lipids correlates with a high level of salinity tolerance (Lin and Wu, 1996;López-Pérez et al, 2009;Mansour et al, 2015). The increase of linolenic acid in plasma membranes was also reported under salt stress in roots of other barley varieties (Yu et al, 1999;Natera et al, 2016).…”

Protective effect of 24-epibrassinolide against salt-induced destabilization of plasma membrane.

“…This again is related to the ability of EB to stabilize the PM under salinity stress and thus may confer salt tolerance (Ding et al, 2012). What supports our contention is the notion that PM is thought to be the primary site of salt injury and hence maintaining its integrity will enhance plant performance in saline conditions (Leopold and Willing, 1984;Cramer et al, 1985;Mansour, 1997Mansour, , 2013Mansour and Salama, 2004;Mansour et al, 2015).…”

“…Perturbation of the PM and hence increased its permeability in response to high salinity has been documented in several previous reports, and was attributed to oxidative stress and ionic impact rather than osmotic stress of salinity (Leopold and . It can be, therefore, inferred that NaCl-induced permeability changes reported here brought about by alterations in the composition of PM lipids and proteins (Mansour et al, 2015). Lipid peroxidation and oxidative damage of proteins of PM may also participate in increased PM permeability induced by NaCl (Mansour, 2013).…”

Evaluation of Dicentrarchus labrax Meats and the Vegetable Quality of Beta vulgaris var. cicla Farmed in Freshwater and Saltwater Aquaponic Systems

“…Several studies demonstrated that salinity affects lipid quality and quantity in glycophyte as well as in halophile plants [25][26][27]; this phenomenon was attributed to the fact that lipids are involved in responses to osmotic stress via their role in maintaining membrane, integrity and fluidity [28].…”