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Rational Modulation of Plant Root Development Using Engineered Cytokinin Regulators.

Rohan Rattan^1,2,3, Simon Alamos^1,2,4, Matthew Szarzanowicz^1,2,4

¹Joint BioEnergy Institute, 5885 Hollis Street, Emeryville, California 94608, United States.

ACS Synthetic Biology

|July 30, 2025

Summary

This summary is machine-generated.

Scientists engineered plant growth regulators to precisely control plant development. This synthetic biology approach allows for predictable tuning of traits like lateral root formation in Arabidopsis thaliana.

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Area of Science:

Plant biology
Synthetic biology
Genetics

Background:

Controlling quantitative developmental phenotypes in plants is crucial but challenging due to complex signaling pathways.
Synthetic biology offers tools to reprogram plant development, yet designing effective genetic programs remains difficult.

Purpose of the Study:

To engineer Type-B response regulators for precise modulation of cytokinin-dependent growth and development.
To develop a modular synthetic system for predictable control of plant traits.

Main Methods:

Engineered Type-B response regulators to alter transcriptional activity (activation/repression) and potency.
Reduced regulator sensitivity to cytokinin.
Utilized tissue-specific promoters to localize engineered transcription factor expression.

Main Results:

Successfully modulated cytokinin-regulated traits in Arabidopsis thaliana.
Demonstrated predictable control over lateral root number (decrease or increase).

Conclusions:

The developed synthetic system offers a simple and modular method for controlling plant developmental phenotypes.
This approach has potential applications for improving agronomic traits in plants.