A simple, highly efficient Agrobacterium tumefaciens-mediated moss transformation system with broad applications

Area of Science:

• Plant Biotechnology
• Moss Genetics
• Stress Physiology

Background:

• Desiccation-tolerant (DT) mosses are crucial models for plant development and stress resistance gene studies.
• Limited efficient transformation systems hinder genetic analysis in these valuable moss species.

Purpose of the Study:

• To develop a simple and efficient Agrobacterium tumefaciens-mediated transformation system for desiccation-tolerant mosses.
• To enable genetic analysis and trait improvement in key moss species like Physcomitrium patens and Bryum argenteum.

Main Methods:

• Utilized Agrobacterium strain EHA105 with binary vector pCAMBIA1301-GUS for transformation.
• Applied histochemical staining, Southern blot, PCR, and RT-qPCR to confirm GUS gene integration and expression.
• Transformed wild Syntrichia caninervis and introduced the EsDREB gene for stress resistance studies.

Main Results:

• Achieved high transformation efficiencies (74% in P. patens, 81% in B. argenteum) without callus formation.
• Confirmed successful gene integration and expression in regenerated transgenic mosses.
• Demonstrated enhanced salt tolerance in transformed P. patens and B. argenteum expressing the EsDREB gene.

Conclusions:

• Presented an efficient and versatile Agrobacterium-mediated transformation tool for desiccation-tolerant mosses.
• This system accelerates genetic research in mosses and supports the development of stress-resistant crop cultivars.