The Salt Overly Sensitive (SOS) pathway: established and emerging roles

Area of Science:

• Plant Biology
• Molecular Biology
• Environmental Science

Background:

• Soil salinity is a significant global agricultural challenge impacting crop yields.
• Plants possess sophisticated mechanisms to sense and respond to environmental stresses like salinity.
• The Salt Overly Sensitive (SOS) signaling pathway is crucial for cellular ion homeostasis under salt stress.

Purpose of the Study:

• To review the emerging complexity of the SOS signaling pathway and SOS protein functions.
• To highlight recent understanding of SOS protein roles beyond ion homeostasis.
• To explore how SOS proteins contribute to plant responses to salt stress in different organs.

Main Methods:

• Literature review of recent research on plant salinity response.
• Analysis of studies investigating SOS protein functions in various plant tissues.
• Synthesis of evidence on SOS pathway involvement in growth and development under stress.

Main Results:

• SOS proteins have novel roles in root development, including lateral root plasticity, by modulating auxin gradients.
• SOS pathway components influence cytoskeletal dynamics in response to salt stress.
• Distinct regulatory mechanisms are employed by roots and shoots to cope with salinity.

Conclusions:

• The SOS signaling pathway exhibits complex regulatory networks in plant response to salinity.
• SOS proteins play multifaceted roles in plant adaptation to salt stress, extending beyond ion homeostasis.
• Understanding these complex roles is vital for developing salt-tolerant crops.