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Updated: Jun 10, 2026

Light Sheet Fluorescence Microscopy of Plant Roots Growing on the Surface of a Gel

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Published on: January 18, 2017

A novel light-dependent selection marker system in plants.

Serry Koh¹, Hongsup Kim, Jinwoo Kim

¹Plant Systems Engineering Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea.

Plant Biotechnology Journal

|August 25, 2010

Summary

This summary is machine-generated.

Researchers identified a toxoflavin-degrading enzyme, TflA, from Paenibacillus polymyxa. This enzyme enables a novel light-dependent, nonantibiotic selection system for plant transformation, outperforming traditional methods in screening efficiency.

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Area of Science:

Plant Biotechnology
Microbiology
Biochemistry

Background:

Photosensitizers, like toxoflavin from Burkholderia glumae, are natural compounds involved in plant diseases and biological processes.
Toxoflavin generates reactive oxygen species under light, causing phytotoxicity and acting as a virulence factor in bacterial rice grain rot.

Purpose of the Study:

To identify and characterize a toxoflavin-degrading enzyme for use as a novel selection agent in plant transformation.
To evaluate the efficacy of the toxoflavin/tflA selection system against a conventional antibiotic resistance system.

Main Methods:

Gene identification for a toxoflavin-degrading enzyme (tflA) in Paenibacillus polymyxa.
Biochemical characterization of the TflA enzyme, including cofactor requirements (Mn(2+), dithiothreitol).
Comparative analysis of the toxoflavin/tflA and hygromycin/hpt selection systems in rice and Arabidopsis transformation.

Main Results:

The tflA gene encodes a 24.56 kDa toxoflavin-degrading enzyme, TflA, requiring Mn(2+) and dithiothreitol.
The toxoflavin/tflA system demonstrated superior performance compared to the hygromycin/hpt system in high-density screening of transgenic Arabidopsis seeds.
The degradation of toxoflavin by TflA functions as a light-dependent selection marker.

Conclusions:

The toxoflavin/tflA system represents a novel, robust, nonantibiotic selection marker for diverse plant species.
This light-dependent system offers an effective alternative for plant transformation and screening.
The findings highlight the potential of utilizing natural photosensitizers and their degrading enzymes in biotechnology.