Enhanced plant regeneration via morphogenic factor expression in protoplast culture

Overview

This research program addresses a persistent bottleneck in plant biotechnology: the difficulty of regenerating whole plants from cultured cells, particularly in crop species that are recalcitrant to standard tissue culture methods. The approach centers on the transient expression of specific morphogenic transcription factors that can reprogram cell identity toward embryonic or shoot-meristem states, unlocking totipotency in systems where conventional growth regulator treatments alone are insufficient. By systematically screening and combining these factors, the program aims to dramatically improve regeneration efficiency in both model and crop systems, enabling faster and more reliable production of edited plants.

Technical specifications

Core approach:

• Transient expression of morphogenic transcription factors in protoplasts to drive cell fate reprogramming
• Comparative screening of approximately thirty transcription factors for their ability to enhance regeneration
• Initial validation in Arabidopsis Col-0, an accession known to be relatively recalcitrant to regeneration
• Extension to wheat, a major crop species recalcitrant in tissue culture

Key findings to date:

• A protoplast regeneration pipeline has been established in Arabidopsis Col-0
• Expression of the transcription factor WIND1 has been shown to double the number of microcalli formed from protoplast culture
• Factors that enhance early-stage regeneration are prioritized for downstream protoplast assays

Potential applications:

• Generation of non-transgenic gene-edited crops through transient protoplast transformation
• Improved tissue culture protocols for recalcitrant crop species
• Accelerated breeding pipelines for small grains and other crops

Technology readiness level

The technology is currently at an early-to-mid stage of development. A functional protoplast regeneration pipeline has been established in Arabidopsis, and initial validation of morphogenic factors (including WIND1) has demonstrated measurable improvements in regeneration efficiency. Ongoing work aims to extend these findings to wheat through both stable and transient transformation approaches, with a proof-of-principle gene editing and regeneration experiment planned through protoplast culture. The program is positioned to advance from laboratory validation toward broader crop species application, with active collaboration with a small grains breeding program to support translational relevance.