TaBAS1 encoding a typical 2-Cys peroxiredoxin enhances salt tolerance in wheat

Area of Science:

• Plant Science
• Molecular Biology
• Genetics

Background:

• Efficient antioxidant systems are vital for plant salt tolerance by preventing reactive oxygen species (ROS) over-accumulation.
• Peroxiredoxins are key ROS scavengers, but their role in wheat salt tolerance and germplasm improvement requires further investigation.

Purpose of the Study:

• To investigate the function of the wheat 2-Cys peroxiredoxin gene, TaBAS1, in conferring salt tolerance.
• To explore the potential of TaBAS1 for improving wheat germplasm for enhanced salt tolerance.

Main Methods:

• Proteomic analysis to identify candidate genes.
• Gene overexpression in wheat to assess salt tolerance at germination and seedling stages.
• Ectopic expression in Arabidopsis to confirm conserved function.
• Assessing ROS scavenging enzyme activities and ROS accumulation.
• Investigating the roles of NADPH oxidase and NADPH-thioredoxin reductase C.

Main Results:

• TaBAS1 overexpression significantly enhanced salt tolerance in wheat at germination and seedling stages.
• Overexpression boosted ROS scavenging enzyme activities and reduced ROS levels under salt stress.
• TaBAS1 function is linked to NADPH oxidase and NADPH-thioredoxin reductase C activities.
• Ectopic expression in Arabidopsis confirmed the conserved role of TaBAS1 in salt tolerance.
• TaBAS1 overexpression increased wheat grain yield under salt stress, demonstrating no yield penalty.

Conclusions:

• The wheat gene TaBAS1 plays a crucial role in conferring salt tolerance through ROS management.
• TaBAS1's mechanism involves regulating ROS-scavenging enzymes and associated pathways.
• TaBAS1 offers a promising candidate for molecular breeding to develop salt-tolerant wheat varieties with improved yields.