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A fluorescence-based high-throughput screening method for cytokinin translocation mutants.

Mengyuan Zhang1,2, Bingli Ding1,2, Jiangzhe Zhao1,2

  • 1Institute of Plant Genetics and Developmental Biology, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua, 321004 Zhejiang China.

Plant Methods
|October 12, 2020
PubMed
Summary

Researchers developed a new method to screen for plant hormone mutants. This technique identified new mutants defective in cytokinin translocation, crucial for plant growth and stress response.

Keywords:
Arabidopsis response regulator 5CytokininEMS mutagenesisFluorescence reporterTranslocation

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Genetics

Background:

  • Cytokinins are vital plant hormones regulating growth, development, and stress responses.
  • While cytokinin signaling and metabolism are well-studied, their translocation mechanisms remain unclear.
  • Arabidopsis response regulator 5 (ARR5) is a cytokinin-inducible gene used as a reporter for endogenous cytokinin levels.

Purpose of the Study:

  • To develop a high-throughput screening method for identifying mutants with altered cytokinin translocation.
  • To identify novel mutants affecting cytokinin distribution and signaling pathways in Arabidopsis.

Main Methods:

  • Utilized an ethyl methyl sulfone (EMS) mutagenesis library of ARR5::eGFP transgenic Arabidopsis plants.
  • Employed a fluorescence-based high-throughput screening method using a luminescence imaging system (LIS).
  • Screened for seedlings with enhanced green fluorescent protein (GFP) signal in roots, indicating cytokinin accumulation.

Main Results:

  • Identified twelve mutants exhibiting elevated GFP signals in roots.
  • Discovered three mutants with reduced GFP signals in aerial tissues.
  • Characterized two mutants as allelic to atabcg14, confirming defects in long-distance cytokinin translocation from roots.

Conclusions:

  • Developed a robust strategy for screening mutants defective in cytokinin translocation, distribution, or signaling.
  • The screening strategy is adaptable for identifying mutants in other hormone transport or signaling pathways.
  • This method facilitates deeper understanding of phytohormone transport and its role in plant physiology.