Functional Characterization and Phenotyping of Protoplasts on a Microfluidics-Based Flow Cytometry

Area of Science:

• Plant Biology
• Cell Biology
• Biotechnology

Background:

• Understanding protoplast phenotypic heterogeneity is crucial for plant science.
• Individual cell analysis is needed to assess environmental influences on plant cells.

Purpose of the Study:

• To develop and apply microfluidic flow cytometry for single-cell phenotyping of protoplasts.
• To quantitatively assess environmental factor impacts on protoplast physiology.
• To investigate cellular responses and metabolic dynamics in plant cells.

Main Methods:

• Microfluidic flow cytometry with fluorescence sensing for protoplast analysis.
• Measurement of intracellular reactive oxygen species (ROS) using DCFH-DA dye.
• Quantitative investigation of stress factors (H2O2, temperature, UV, cadmium) on ROS accumulation.

Main Results:

• Environmental stresses significantly alter intracellular ROS levels in Arabidopsis protoplasts.
• Petunia protoplasts from white petals exhibit a stronger oxidative burst than purple petals, indicating anthocyanin photoprotection.
• Auxin positively influences primary cell wall regeneration, and UV-B enhances this by increasing intracellular auxin.

Conclusions:

• Microfluidic flow cytometry provides unbiased assessment of single-cell plant physiology.
• Significant phenotypic variability exists within protoplast populations.
• The study highlights the dynamic interplay between environmental factors, cellular metabolism, and plant cell regeneration.