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Related Experiment Videos

A novel fluorescent pH probe for expression in plants.

Alexander Schulte1, Inken Lorenzen, Markus Böttcher

  • 1Zentrum für Biochemie und Molekularbiologie, Universität Kiel, Am Botanischen Garten 9, 24118 Kiel, Germany. cplieth@zbm.uni-kiel.de.

Plant Methods
|April 8, 2006
PubMed
Summary

A new fluorescent pH reporter, Pt-GFP, derived from the orange seapen, offers better acid stability and broader responsiveness than traditional pHluorins for monitoring cellular pH in plants.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Plant Science

Background:

  • Cellular pH is critical for metabolic and signaling pathways.
  • Fluorescent pH indicators (pHluorins) derived from Aequorea victoria GFP (Av-GFP) are widely used.
  • A novel fluorescent pH reporter, Pt-GFP from Ptilosarcus gurneyi, is introduced.

Purpose of the Study:

  • To characterize the novel Pt-GFP pH reporter.
  • To compare Pt-GFP properties with existing pHluorins for plant applications.
  • To evaluate Pt-GFP for in vivo monitoring of plant cellular pH.

Main Methods:

  • Expression of Pt-GFP in Arabidopsis thaliana.
  • Comparison of Pt-GFP and pHluorin properties (pH-sensitivity, dynamic range, acid stability).
  • Monitoring of cytosolic pH dynamics under stress conditions (anoxia, salt-stress).

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Main Results:

  • Pt-GFP exhibits broader pH-responsiveness and excellent dynamic ratio range.
  • Pt-GFP demonstrates superior acid stability compared to pHluorins.
  • Pt-GFP successfully reported cytosolic pH-clamp and stress-induced pH changes in Arabidopsis.

Conclusions:

  • Pt-GFP is a valuable new tool for in vivo cellular pH monitoring in plants.
  • Pt-GFP offers advantages over traditional pHluorins for plant research.
  • Pt-GFP enhances the study of plant physiological responses to environmental stimuli.