Exploring the Physiological and Molecular Mechanisms of Halophytes' Adaptation to High Salinity Environments: Implications for Enhancing Plant Salinity Tolerance

Abstract

Salinity stress poses a significant challenge to plant growth and agricultural productivity worldwide. However, certain plant species, known as halophytes, have evolved remarkable adaptive mechanisms to thrive in high salinity environments. Understanding the physiological and molecular mechanisms underlying the salt tolerance of halophytes holds great potential for enhancing salinity tolerance in non-halophytic crop plants. This review aims to explore the adaptive strategies employed by halophytes to cope with salinity stress and their implications for improving plant salinity tolerance. Physiological adaptations of halophytes include mechanisms to regulate ion homeostasis, maintain osmotic balance, and minimize water loss under high salinity conditions. These adaptations involve the accumulation of compatible solutes, such as proline and glycine betaine, as well as the compartmentalization of toxic ions in vacuoles. Halophytes also exhibit efficient antioxidant systems to counteract oxidative stress induced by salt accumulation. At the molecular level, halophytes employ a range of genetic and epigenetic mechanisms to regulate gene expression and enhance salt tolerance. These mechanisms include the activation of stress-responsive transcription factors, modulation of ion transporters and channels, and epigenetic modifications that alter chromatin structure and gene expression patterns. Recent advancements in molecular techniques, such as transcriptomics and proteomics, have provided valuable insights into the complex regulatory networks involved in halophyte salt tolerance. Harnessing the knowledge gained from halophyte adaptation mechanisms can offer promising prospects for improving the salinity tolerance of economically important crop plants. Genetic engineering and breeding approaches can be employed to introduce or enhance the expression of key salt tolerance genes in non-halophytic species. Additionally, the identification and utilization of halophytederived salt tolerance traits through conventional breeding strategies hold great potential for developing salt-tolerant crop varieties. Therefore, the investigation of halophytes' physiological and molecular mechanisms of salt tolerance provides valuable insights into the intricate strategies employed by plants to adapt and thrive in high salinity environments. The knowledge gained from these studies can be harnessed to enhance the salinity tolerance of non-halophytic crop plants, thereby contributing to sustainable agriculture in salinity-affected regions.

Sulfur-Oxidizing Bacteria Alleviate Salt and Cadmium Stress in Halophyte Tripolium pannonicum (Jacq.) Dobrocz.

“…Recent genetic and molecular research has revealed complicated regulatory pathways and networks through which halophytes coordinate their adaptation and tolerance to stress [12][13][14][15]. Numerous molecules are involved in these networks, with sulfur (S) being one of the key players.…”